Chapter 6 Student Edition

PANITIA BIOLOGI NEGERI KELANTAN 2007

CHAPTER 6 : NUTRITION

Multiple Choice Questions:For question 6-1 to 6-76, each question is followed by four alternative options A,B,C and D.

Choose one correct answer for each question and blacken the corresponding space in your

objective answer

6.1 Understanding Types Of Nutrition

1. Organisms which are not able to synthesize their own food are

A autotrophs.

B heterotrophs.

C parasites.

D pathogens.

2 Plants are

A autotrophs.

B heterotrophs.

C saprophytes.

D parasites.

3 Which of the following plants is not capable of carrying out photosynthesis?

A Bamboo

B Sunflower

C Pitcher plant

D Mushroom

4 Which is the mode of nutrition of decomposers?

A Saprophytism

B Parasitism

C Holozoic nutrition.

D Autotrophic nutrition

6-1


5 Which of the following organisms practice parasitism?

A Ferns

B Saprophytic bacteria

C Tapeworms

D Amoeba sp

6.2 Applying The Concept Of Balanced Diet

6 Why is vitamin E essential in our diet?

A Aids absorption of calcium and phosphates.

B Needed for maintenance of a healthy skin.

C Reduces muscle cramps.

D Prevents sterility in both sexes.

7 What vitamins can be produced by bacterial action in the large

intestine?

I Vitamin A

II Vitamin B complex

III Vitamin E

IV Vitamin K

A I and III only

B II and IV only

C I, II and III only

D IV only

8 Rich sources of vitamin A are

I Spinach.

II Tomato.

III Bread.

IV Liver.

A I and III only

B II and IV only

C I, II and IV only

D I and II only

6-2


9 Which of the following regarding roughage is true?

I It prevents constipation.

II It has high energy content.

III It is made up of plant fibres and cellulose.

IV It helps in peristalsis.

A I and III only

B II and IV only


D I, III and IV only

10 A sample of urine taken from a person suffering from diabetes mellitus was boiled with

Benedict's solution. Which of the following results can be obtained?

A The mixture becomes purple.

B A purple precipitate was formed.

C A brick-red precipitate was formed.

D The mixture becomes blue.

6.3 Malnutrition

11 Lack of vitamin D in the diet will cause

A scurvy.

B beri-beri.

C rickets.

D pellagra.

12 Which of the following is the result of calcium deficiency?

I Delayed blood clotting

II Bow legs

III Dental caries

IV Dry skin

A I, II and III only

B I and II only

C II, and IV only

D I, II, III and IV

6-3


13 Shortage of lipids in a cell will cause

I incomplete formation of cell membrane.

II adipose tissue does not exist.

III protein synthesis does not occur.

IV muscles will not contract.

A I and II only

B II and III only

C II and IV only

D III and IV only

14 What happens to the excess amino acid that is absorbed?

A Changed to protein to be stored.

B Changed to urea to be excreted.

C Changed to adipose tissue to be stored.

D Changed to digestive enzymes to be used.

15 Which of the following diseases is due to the lack of vitamin in the

diet?

I Xerophthalmia

II Rickets

III Pellagra

IV Haemophilia

A I and III only

B II and IV only



6.4 Food Digestion

16. What enzyme does saliva contain ?

A Amylase

B Lipase

C Protease

D Sucrase

6-4


17.

A

B

D

C

DIAGRAM 6.1

Which of the following parts of the human digestive system shown Diagram .6.1. does

not produce enzymes?

18. Which part of the human digestive system has an enzyme that hydrolyses fats ?

A Mouth

B Oesophagus

C Stomach

D Duodenum

19. Diagram 6.2 below shows a part of the human digestive system.

DIAGRAM 6.2

What will happen if tube X is blocked ?

A No enzymes can go into the duodenum

B The digestion of carbohydrate will decrease

C The digestion of fat will decrease

D Digested food cannot be carried to the liver.

6-5

FF


20.

What organisms living in the stomach of the cow digest the grass and what enzymes

are produced by the organisms?

21. Which of the following graphs show the effect of optimal pH on the rate of reactions of

pancreatic enzymes?

6-6

• Partially chewed grass is digested in the stomach of a cow.• The cow does not produce enzymes to digest the grass.• Organisms living in the stomach of the cow produce an enzyme to digest the grass.

Organism Enzymes produced A Bacteria CellulaseB Fungi AmylaseC Viruses ProteaseD Fungi Lipase


6.5 Absorption And Assimilation Of Digested Food

22. Which of the following are functions of the liver?

I Destruction of red blood cells

II Regulation of blood sugar level

III Conversion of excess amino acids into urea

IV Synthesis of bile

A I and III only

B II and III only

C II and IV only

D I,II, III and IV

23. Amino acids are used for

I respiration

II photosynthesis

III cell growth and cell repair

IV making enzymes and proteins of plasma membrane

A I and III only

B II and III only

C III and IV only

D II, III and IV only

6-7


Based on diagram 6.3, answer questions 24 and 25

Y

X

DIAGRAM 6.3

24. Nutrients that can be found in X are

I glucose

II vitamin D

III vitamin C

IV amino acids


B I, III and IV only

C II, III and IV only

D I, II, III and IV

25. What is the function of the part labelled Y ?

I to absorb amino acids

II to transport fatty acids

III to increase the surface area of the villus

IV to transport glucose and blood

A II only

B I and IV only

C II and III only


6-8


26. Which of the following processes can take place in the colon of the human body?

I Absorption of vitamin K

II Absorption of water

III Absorption of mineral salts

IV Secretion of enzymes


B I, II and IV only


D I, II, III and IV

6.6 Formation Of Faeces And Defaecation

27. Which of the following are absorbed through the colon?

A Ions and water

B Ions, water and nutrients

C Ions and nutrients

D Nutrients and undigested food

28. In which part of the large intestine shown in the below diagram 6.4 are heamorrhoids

found?

DIAGRAM 6.4

A Anus

B Colon

C Rectum

D Appendix

6-9


29. Which of the following nutrient are absorbed into the blood capillaries of the villi?

I Fatty acids

II Simple sugars

III Vitamin C

IV Iron

A I, II and IV only

B I, III and IV only


D I, II, III and IV

30. What is the function of dietary fibre?

A Make food stay longer in intestine

B Give colour to faeces

C Stimulate peristalsis

D Prevent diseases

31. Constipation is due to faeces being in the large intestine for too long. What type of food

can help to overcome constipation?

A Food with fat-soluble vitamins like vegetables

B Liquid food or with high water content

C High fibrous food like vegetables

D Food rich in proteins and vitamins

6-10


6.7 Evaluating Eating Habit

32. The statement above describes a condition of En. Mail’s stomach. He is most likely

suffering from

A obesity

B gastritis

C bulimia

D anorexia nervosa

33. Patients with the symptoms above may risk getting

A ulcer

B gastritis

C bulimia

D obesity

34. Diagram 6.5 shows an obese person.

DIAGRAM 6.5

He is predisposed to diseases below except

A hypertension

B cardiovascular

C kidney damage

D diabetes mellitus

6-11

Symptoms:Abdominal pain, nausea, belching, vomiting

The epithelial lining of stomach becomes inflamed


35.

The statement describe the patient of

A diabetes

B bulimia nervosa

C anorexia nervosa

D muscular dystrophy

36. The victim with the characteristic above refer to

A obesity

B bulimia nervosa

C diabetes mellitus

D anorexia nervosa

37. Good eating habits ensure good health. Besides eating regulars meals, the types of

food are also important. Which of the following statement is not true?

A Suitable mineral salts

B High amount of calories

C Sufficient water and roughage

D Contains fats, carbohydrate and proteins

6.8 Importance Of A Healthy Digestive System

38. What are the ways to maintain a healthy digestive system?

I Avoid junk food

II Have a good eating habits

III Cut down on starchy food

IV Reduce intake of fatty food

A I and II only

B III and IV only

C I, II and IV

D I, II, III and IV

6-12

They lost both fat and muscle and lead to disruptions of the function of the heart and endocrine system

They may have a normal body mass but engage in consuming huge amounts of food within a short period of time


39. If the pancreatic duct is blocked, a man may have difficulty digesting

A fat

B proteins

C vitamins

D carbohydrates

40. Diagram 6.6 shows part of the human alimentary canal.

DIAGRAM 6.6

The movement of food along the alimentary canal is called

A chewing

B peristalsis

C absorption

D emulsification

41. Which of the following are not associated with poor digestion?

A Nausea

B Indigestion

C Diarrhoea

D Ingestion

42. A person’s diet contains more protein than is needed for growth and repair. What is the

effect of this situation?

A An increase in the production of urea

B An increase in the production of pepsin

C An increase in the production of lactic acid

D An increase in the production of carbon dioxide

6-13


43 Diagram 6.7 shows parts of the human alimentary canal.

DIAGRAM 6.7

Structure P stores bile. A patient in hospital has had the structure removed and

needs a special diet. Which menu would be most suitable for this patient?

A Fish in cheese sauce and fruit pie

B Sausages, boiled potato and cream cake

C Skinless chicken, green salad and fresh orange

D Fried fish, potato chips and sweet rice

44. A patient suffers from a malfunctioning pancreas. Which biological process would be

affected?

I Digestion of food

II Secretion of pancreatic juice

III Conversion of glucose to glycogen

IV Conversion of glycogen to glucose

A I and III only

B II and IV only


D I, II, III and IV

6.9 The Importance of Macronutrients and Micronutrients in Plants

45. Which of the following statements are true about macronutrients and micronutrients for

plant?

I Each nutrient plays the same role in the growth of plant

II Macronutrients and micronutrients are essential for the growth of plants

III Plants only require macronutrient for healthy growth

IV All macronutrients and micronutrients are needed by plant in different quantities

A I and II only

B I and III only

C II and III only

D II and IV only

6-14

Structure P


46. Which of the following is not the correct match of materials ions and their functions?

Mineral ions Function

A Calcium Major component of the middle of cell wall

B Magnesium Component of chlorophyll

C Nitrate Important constituent of cellulose

D Phosphate Component of tonoplast

47. Which of the following are examples of major elements in plant nutrition?

I Boron

II Nitrogen

III Calcium

IV Phosphorus


B I, II and IV only


D I, II, III and IV

48. Which of the following elements are needed in large quantities to form chlorophyll?

A Calcium and iron

B Iron and nitrogen

C Calcium and magnesium

D Nitrogen and magnesium

6-15


TABLE 1

49. An experiment is carried out to study the effect of deficiency of macronutrients. The

aquatic plant, Lemna which has green leaves is grown in solution X and solution Y. After

six weeks, the observation are as shown in Table 1. Which of the following is true about

solution X and solution Y?

Solution X Solution Y

A No phosphorus No nitrogen

B No magnesium No phosphorus

C No nitrogen No phosphorus

D No nitrogen No magnesium

50. Diagram 6.8 shows the apparatus set up of an experiment to study the need of nutrient

for plant growth.

DIAGRAM 6.8

Tube X is connected to an air pump. What is the function of tube X?

A To add nutrient to the culture solution

B To add oxygen to the culture solution

C To remove water from the culture solution

D To remove microorganisms from the culture solution

6-16

Observation after six weeksSolution

Number of leaves Colour of leaves

X Same Yellow

Y More Yellow


51. The leaves of plant A are dark green, its roots do not develop well and its growth is

stunted. Plant A probably lacks

A iron

B sodium

C phosphorus

D magnesium

6.10 Photosynthesis52. Plant requires carbon dioxide and water to synthesise food. Water used by plant comes

from

A. air

B. soil

C. nutrient

D. leaf

53. Which of the following substances required for photosynthesis?

I. O2

II. CO2

III. H2O

IV. C6H12O6

A. I, II and III only

B. I and IV only

C. II and III only

D. I, II, III and IV

54. Which of the following substances are produced from photosynthesis?

A. Glucose, Oxygen and water

B. Glucose, Oxygen and Carbon Dioxide

C. Glucose and Energy

D. Energy, Water and Carbon Dioxide

6-17


55. Diagram 6.9 below shows a section through a leaf of a plant

DIAGRAM 6.9

What is the adaptation of the structure P to optimise photosynthesis?

A. Have a lot of chloroplast

B. Large air spaces between cell

C. Cylindrical cell arranged end to end in long row

D. Waterproof layer on the surface

56. Plants from different habitats are adapted to carry out photosynthesis. Which of the

following is not the right adaptation for the following plant?

A. Bunga Raya or Hibiscus have more stomata at the lower epidermis

B. Water Lily have only stomata at the upper surface of the leaf

C. Hydrilla only have chloroplast at the leaf

D. The stem of cactus have many chloroplast

6.11 The Mechanism Of Photosynthesis

57. Diagram 6.10 below shows the structure of an organelle in plant cell.

DIAGRAM 6.10

Which of the following process occurs in structure Q?

A. Reduction of carbon dioxide

B. Water photolysis

C. Respiration

D. Synthesis of protein

6-18

Q

P


58. Which of the following statement is true?

A. The Hydrogen atoms produced during dark reaction are used in light reaction

B. Light reaction occurs in the granum of the chloroplast

C. Dark reaction only occurs at the night

D. The product of light reaction is converted into starch

59. In the light reaction

A. hydrogen atom reduce carbon dioxide

B. four hydroxyl group combine together to form water and oxygen

C. six unit of (CH2O) combine together to form a molecule of glucose

D. energy from sunlight is absorbed to split water molecules into hydroxyl ions and

oxygen ions

60. Which of the following is true about dark reaction of photosynthesis

A. The dark reaction take places in grana

B. Happens both when there is a light and when it is dark

C. Occurs only when it is dark

D. The dark reaction produced water and oxygen

61. Which of the following equation is the general equation of photosynthesis?

A. H2O ---- H+ + OH-

B. H+ + electron --- H

C. 6H + 6CO2 -- C6H12O6 + 6 H2O

D. 6 H2O + 6 CO2 C6H12O6 + 6 O2

6.12 The Factors Affecting Photosynthesis

62. The following statements are the factors affecting the rate of photosynthesis, except

A. light intensity

B. concentration of carbon dioxide

C. temperature

D. pH

6-19


63. Diagram 6.11 below shows the effect of light intensity on the rate of photosynthesis at

different levels of carbon dioxide

DIAGRAM 6.11

Based on the above figure, which of the following statement is true

A. The temperature and concentration not constant

B. Carbon dioxide is the limiting factor

C. Light intensity is the limiting factor

D. The rate of photosynthesis can be increased by increasing the carbon dioxide

concentration

64. Generally, an increase of 10oC in the surrounding temperature will double the rate of

photosynthesis. However, when the temperature is too high, the photosynthesis stop.

Which of the following statement is true?

A. When the temperature is too high, enzymes are denatured

B. The plant cannot absorb any more water

C. When the temperature is too high, the stomata are closed

D. No more carbon dioxide is supplied

65. Why the rate of photosynthesis is low in the morning and evening and high during

midday?

A. Light intensity are low and temperature is high in the morning

B. Light intensity are high and temperature are low in the morning

C. Light intensity and temperature are at the highest during midday

D. Dark reaction starts at night when there is no light

.

6-20

0.08% Carbon Dioxide



Rate of photosynthesis

Light intensity


DIAGRAM 6.12

66. The apparatus shown in diagram 6.12 has been set up to investigate the effect of light

intensity on the rate of photosynthesis. The experiment is repeat a few times by

adjusting the distant between lamp and Hydrylla sp. Which of the following is true about

this experiment?

A. The number of bubbles is used to represent the rate of photosynthesis.

B. The light intensity is decreased progressively by bringing the light bulb nearer to

the plant

C. The results shows that the number of bubbles per minute increases as the

distance between the light bulb and Hydrylla

D. The rate of photosynthesis decreases with light intensity

6.13 A Caring Attitude towards Plants

67. Why do we need to take good care of plants?

I Plants supply food for us

II Plants absorb carbon dioxide from the air to prevent the green house effect

III Plants play an important role in the water cycle

IV Plants prevent soil erosion

A I and II only

B I and II and III only

C II and III and IV only

D I, II, III and IV

6-21

lamp Hydrylla

Sodium bicarbonate solution


68. Why are green plants essential to all other living things?

I Green plants convert sunlight into chemichal energy which is made available to other living

things which eat these plants.

II Green plants remove carbon dioxide from the air during photosynthesis

III Green plants remove sulphur dioxide from the air during photosyntesis.

IV Green plants produce oxygen which is used by all living things

A. I and III only

B. I,II and IV only


D. I, II, III and IV only

6.14 Technology Used in Food Production

69. Which of the following is the necessity for food processing?

I Ensuring sufficient food supply

II Avoiding food wastage

III Preventing food from going bad

IV Creating varieties of food

A I and II only

B II and III only


D I, II III and IV

70. Diagram 6.13 shows the products of a method of food production

6-22


DIAGRAM 6.13

Which of the following are true about the method?

I Foods can be preserved over a year

II Used only for preservation of fish and vegetables

III Can destroy enzymes and kill microorganisms

IV Discovered by Louis Pasteur

A I and II only

B I and III only

C II and IV only

D I. III and IV only

71. Which of the following technology of food production is explained by the information

above?

A Direct planting

B Tissue culture

C Aeroponics

D Hydroponics

6.15 Technological Development in Food Processing

6-23

Method of planting by replacing the soil medium with culture solution for the plants to grow.


72. Which of the following is true about canning?

I T h e f o o d i s h e a t e d , sterilized and sealed in airtight containers.

II Pathogens and bacteria are destroyed.

III The food can be kept for a long period of time.

IV The quality of food is lost in canned food.

A I and II only

B II and III only

C I, II and III

D I, II, III and IV

73. A food processing method which involves culturing microorganism is

A pasteurisation.

B fermentation

C refrigeration.

D dehydration

74 . The bene f i t s f r om t he technological development in food processing are

I avoiding food wastage.

II producing high quality food.

III extending the lifespan of food.

IV reducing the spoilage food.

A I and II only

B I, II and III only

C I, II and IV only

D I, II, III and IV

75. Diagram 6.14 shows a type of fruit.

6-24


DIAGRAM 6.14

Which of the following food processing methods can be used to prevent the fruit from

going bad?

I Canning

II Drying

III Pasteurisation

IV Using salt and sugar

A I and II only

B I and III only

C II and IV only

D I, II and III only

76. The following is correct about pasteurisation of milk exceptA milk is heated to 63°C for 15 minutes

B milk is rapidly cooled after heating

C sudden change in temperature kills the microorganisms in milk

D heating milk for a short period preserves the nutrient content in food

Structured Items

6-25


Answer all questions. Write your answer in the spaces provided in the question paper


1. Diagram 6.15 shows different types of nutrition.

Nutrition

Autotrophic Heterotrophic

X Y P Q R

Diagram 6.15

(a) Give the definitions of:

i. Autotrophic nutrition

ii. Heterotrophic nutrition

[2 marks]

(b) Name the types of nutrition represented by P, Q and R

P:

Q :

R :

[ 3 marks]

(c) Give one example for each type of the nutrition named in (b)

6-26


[ 3 marks]

(d) What are represented by X and Y ?

[2 marks]

(e) Give one example for each type of the nutrition named in (d)

[ 2 marks]


2. Diagram 6.16 shows a food pyramid. The correct proportion for the various classes of

food is shown in a food pyramid

P

Q

R

S

DIAGRAM 6.16

(a) Name the class of food for each level labelled as P,Q,R and S

6-27


[4 marks]

(b) Give an example for each of the food class mentioned in (a).

[4 marks]

(c) Give four factors that affect the daily energy requirements of a person

[4 marks]

6.3 Malnutrition

6-28


3. Diagram 6.17 shows individuals suffering from malnutrition

DIAGRAM 6.17

(a) What disease are the individuals P, Q and R suffering from?

[ 3 marks]

(b) Which substance is deficient in the diet of each of individuals P, Q and R?

P:

Q:

R:

[ 3 marks]

(c) Name the disease caused by deficiency of each of the following vitamins?

i. vitamin B1:

ii. vitamin C :

[2 marks]

(d) State two symptoms for each of the diseases in (c)

[4 marks]

6-29

RQP


6.4 Food digestion

4. Diagram 6.18 below shows the stomach of a herbivorous animal.

DIAGRAM 6.18

(a) i. Name an example of an animal that has this type of stomach.

ii. What is the name of this group of animals?

[ 2 marks]

(b) i Name the labelled parts of the stomach.

[ 5 marks]

ii State one function for each part.

[5 marks]

6-30


(c) i. Which part of the stomach contains micro-organisms?

ii. Name the group of micro-organism found in this animal’s stomach.

iii. What is the main role of these micro-organisms?

[ 3 marks]


5. Diagram 6.19 below shows the vertical section of the head and mouth of a person.

DIAGRAM 6.19

(a) State two processes that happen to the food in the mouth.

[2 mark ]

(b) State two important reasons for these processes.

[2 mark ]

6-31

P

Q


(c) Name the labelled parts.

[ 2 marks]

(d) Explain how the process of swallowing occurs in the diagram.

[3 marks ]

(e) Food can also enter into tube P. Explain.

[ 1 mark]

(f) What is the name of the movement of food along tube Q?

[ 1 mark]

6.

(a) What class of food found in fruits, vegetables and cereals that will help him to

prevent constipation?

6-32

An individual’s diet consists of white bread, sweet food, meat and high fat foods and this leads to constipation. The doctor advises him to eat more fruits, vegetables and cereals


[ 1mark]

(b) Explain why the above class of food prevents constipation.

[ 4mark]

(c) Name two diseases ( other than constipation ) that can be prevented with more

intake of the above class of food.

[ 2 marks]


DIAGRAM 6.20

7. Diagram 6.20 shows the human digestive system.

(a) Name organs C and B

Organ C

Organ B

[ 2 marks]

(b) Name the enzyme and the product of the food digested in B.

Enzyme :

6-33


Product :

[ 2 marks]

(c) Name two processes in R. Explain how the ileum is adapted for these

processes.

[ 4mark]

(d) i. In the box below draw a labelled diagram of the structures found

on the cell wall of D.

[ 3 mark ]

ii State three characteristics of the structure, which help it to perform

efficiently.

[ 3 mark ]

6-34

EpitheliumBlood capillaries

Lacteal


iii. State the functions of the blood circulatory system and lymphatic system

in the structure.

[ 4 mark ]

(e) i. Explain the difference between a human and herbivore digestive system.

[ 2 marks]

ii State where cellulose digestion takes place in rabbits and cattle.

[ 2 marks]

6.7 Evaluating Eating Habits

6-35


8. Table 1 shows an analysis of the contents of a biscuit’s packets.

TABLE 1

a. i. Which of the food substances is used for growth and repair a damage

cell?

[ 1 mark ]

ii Which of the food substances may contain a simpler sugar?

[ 1 mark ]

iii What is the percentage of the food contents that are not included in

the list?

[ 1 mark ]

b. i What kind of food substances is not in the list?

[ 1 mark ]

ii Which food in your answer in (b)(i) could help a person to avoid

constipation?

Explain briefly how it works.

6-36

Carbohydrate 35.9 %Proteins 20.7 %Fats 8.5 % Minerals 3.3 %Vitamins 0.7 %


[ 4 marks ]

c. Iron is one of the minerals that our body need. Iron requirement is higher in a girl

but lower in a boy of the same age. Suggest your answer for this statement.

[ 2 marks ]

d. Explain the effects of smoking cigarettes on health problem during pregnancy.

[ 2 mark ]

6.8 Importance Of A Healthy Digestive System

9 (a) i What type of food is digested in the stomach?

[ 1 mark ]

ii Why is the stomach wall not digested even though there are enzymes

inside it?

.

[ 2 marks ]

(b) i State one function of colon.

ii State one food which does not need to be digested.

]

6-37


iii What happen to the undigested food?

[ 3 marks ]

(c). Explain why most of the food need to be digested.

[ 2 mark ]


10 Table 2 shows an experiment to study the effects of the lack of nutrient in plants.

Bottle

Salt1 2 3 4 5 6 7 8

0.8 g/ l calcium nitrate X / NaNO3 / X / / /

0.2 g / l calcium nitrate X / / / X / / X

0.2g / l potassium dihydrogen

phosphate/ KCl / / / / / X

0.2 g / l magnesium sulphate / / / / / / K2SO4 /

Ferrum phosphate / X / X / / / /

1000 cm3 distilled water / / / / / / / /

6-38


TABLE 2(a) Which of the bottles contained a complete Knop’s culture solution?

[1 mark ]

(b) State the mineral nutrients that are not present in the following bottles:

[3 marks ]

(c) State one effect from the lack of mineral nutrients in the following bottles:

[3 marks]

(d) State the mineral nutrients missing in Bottle 4.

[1 mark ]

(e) Give one function of

i Phosphorus

6-39


ii Magnesium

[2 marks]

[ 2 marks ]

6.10 Photosynthesis

DIAGRAM 6.21

11. Diagram 6.21 shows a cross section of a leaf.

(a) The leaf is adapted to optimise photosynthesis through external

features and internal features.

i. State two adaptation to the structure for external features to optimise

photosynthesis

ii. Explain your answer.

6-40

P:

Q:R:

S:


[ 4marks]

(b) Label the boxes in the diagram [ 2 marks ]

(c) i. State one adaptation of structure P to optimise photosynthesis

]

ii. Explain your answer in c (i)

[ 2 mark ](d) State one adaptation of structure S of the plant to optimise photosynthesis

and give your explanation.

Cactus

Water Lily

[4 mark]

6-41

Process M


6.11 The Mechanism Of Photosynthesis

Process N

DIAGRAM 6.22

6-42

Reduced Carbon dioxide to form glucose

Receive electron to form atom X

Sun

Water X+ + OH-

Process S

Process R


11. (a) State what is X?

Name the process N

[ 2 marks ]

(b) Explain your answer

[2 marks ]

(c) Water used in Process N. Where does the water come from?

[1 mark]

(d) Process R occurs in one part of chloroplast. Name the part.

[1 mark ]

(e) Write down the general equation of photosynthesis

[1 mark]

(f) State two differences between dark reaction and light reaction

[ 2 marks ]

[2 marks ]

(g) State one difference between photosynthesis and Process M

[1 mark ]

(h) State what happens to the Hidroxide ions during Process S

[1 mark]

6-43

0.13% CO2 at 30oC


6.12 The Factors Affecting Photosynthesis

13. Diagram 6.23a and 6.23 b shown factor affect the rate of photosynthesis

The concentration of carbon dioxide and temperature are controlled at constant levels

(a) i. In Diagram 6.23a, before point P, what is shown by the graph?

ii. What happens to the rate of photosynthesis up to point P

[ 2marks ]

(b) State two limiting factors which limit the reaction along PQ

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Q

DIAGRAM 6.23aDIAGRAM 6.23b

Rate of photosynthesis

Rate of photosynthes

Light intensity temperature

P

0.03% CO2 at 30oC


[ 2 marks ]

(c) In Diagram 6.23a draw the graph if the concentration of carbon dioxide is more

than 0.13 % at 30oC [ 1mark ]

(d). Based on Diagram 6.23b, explain the relationship between the rate

of photosynthesis and temperature

[ 3 mark ]

(e) Photosynthesis stops at 50 oC . Explain why?

[ 1 mark ]

(f) Under what condition does carbon dioxide concentration become a limiting

factor?

[ 1 mark ]

(g) The rate of photosynthesis in plant is not constant throughout the day.

Explain why the rate of photosynthesis is low in the morning and high during

midday.

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[ 2 marks ]

6.14: Understanding the technology used in food production

14. The population of Malaysia is increasing rapidly. Hence, there is a need to increase the quantity as well as the quality of food to fulfill the demand.

Diagram 6.24 shows one of the method used to increase food production.

(a) (i). Name the method.

[1 mark]

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DIAGRAM 6.24


(ii) What is fluid X?

[1 mark]

(b) The method in (a)(i) does not use soil to grow vegetables. Explain why.

-

[2 marks]

(c) Aeroponics is another way to grow plants without using soil.

How does it differ from the method (a)(i).

[Any two correct answers: 2 marks]

(d) State 2 advantages of using this method to grow vegetables

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[Any two correct answers: 2 marks]

e) Beside the method in (a)(i) and the aeroponics, explain two other ways that

could be used to increase the food production.

[2 marks]

6.15 Technology in food processing

P Q

DIAGRAM 6.25

15. State one method to preserve P and Q so the food can be kept for a long time.

P:

Q: [ 2 marks]

(a) Explain the process in (a)

P:

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P

Q


[4 marks]

Q:

[4 marks]

(b) Explain why it is not good to eat too much preserved food

-

[2 marks]

Essay Items

Answer all questions


1. Compare and contrast the following modes of nutrition:

(a) autotrophic nutrition and heterotrophic nutrition [4 marks]

(b) photoautotrophic and chemoautotrophic nutrition [5 marks]

(c) Saprophytic nutrition and parasitic nutrition [4 marks]


2 (a) What is meant by a ‘balanced diet’? [2 marks]

(b) Discuss the importance of the following classes of food:

i. roughage

ii. water [8 marks]

(c) Discuss briefly a diet appropriate for the following target group:

i. children

ii. pregnant mothers [10 marks]

6.3 Malnutrition

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3. (a) The table shows an analysis of the percentage nutrient content of a

balanced diet that should be taken by a person daily.

Nutrient Percentage intake

Carbohydrate 60

Lipid 30

Protein 10

Vitamin & mineral salts Small quantity

The table shows the daily eating habits of Siti and Devi

Discuss the advantages and disadvantages of the eating habits of Devi compared

to Siti over a period of time. [10 marks]

(b) Obesity and anorexia nervosa are two diseases caused by malnutrition. Discuss.

6.4 Food Digestion

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Siti Devi

· Eats regularly at a fixed time.

· Drinks at least 7 glasses of

water daily.

· Chooses food that contains

carbohydrates, lipids, proteins,

vitamins and mineral salts

based on the standard of a

balanced diet.

· Eats irregularly as and when she

remembers or when she is free.

· Drinks very little water.

· Likes to eat fast food and junk

food that does not contain the

right amount of carbohydrates,

lipids, proteins, vitamins and

mineral salts, does not follow the

standard of a balanced diet.

Pp


4. a Name the parts of the digestive system labelled P, X, R, and S

in Figure 27. [ 4 marks]

b Describe the functions of the part labelled P [ 8 marks ]

c. Digestion of food occurs actively in the part labelled S which receives juices

secreted by the part labelled P and R. Explain the digestion of food in the part

labelled S. Word equations should be given to show the reactions which occur

during digestion. [ 8 marks ]


5. (a) Explain what is digestion. [2 marks]

(b) Discuss the digestion of cellulose in ruminants. [10marks]

(c) State the differences between the processes of cellulose digestion in

I . humans

II. ruminants

III. rodents [ 8 marks]


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RS


6.7 Evaluating eating habit

6. Diagram 1 shows the menu for Susan’s breakfast. She takes a cup of milk and two

slides of whole meal bread spread with butter.

DIAGRAM 1

a. i. Is Susan’s breakfast menu a balanced diet for an adult? Give

reasons for your answer. [ 4 marks]

ii Explain how the food rich in carbohydrate is digested in the body of

Susan. [ 6 marks]

b. Table 1 shows the results of an analysis on a snack food such as Rempeyek

chips.

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Content Mass per 100g of Rempeyek chips

Carbohydrate

Protein

Lipid

Fibre

Sodium chlorides

21.1

2.7

18.5

1.8

0.4


A boy frequently eats this snack food. He eats three packets everyday in the

evening. Are the Rempeyek chips suitable as a daily diet for the boy?

[ 2 marks]

c John likes to eat fried chicken, hamburger, chocolates and ice-cream and he

dislikes vegetables and fruits. Discuss why this is an unhealthy diet.

[ 8 marks ]

6.8 The Importance of a Healthy Digestive System

7 (a) i Rice and salt are important component of an individual’s diet. Rice

need to be digested before it can be absorbed whereas salt can be

absorbed directly. Explain why. [8 marks]

ii Explain how bad eating habits can cause a health problem.

[2 marks]

(b)

Imagine that you are preparing a talk on” Good eating habits” for group of parents,

discuss some good eating habits that you may want to educate them. [10 marks]


8. (a) Distinguish between major elements and essential elements in relation to a

plant’s nutritional requirements.

[12 marks]

(b) State two functions each for the following elements in plants. [ 8 marks]

6.10 Photosynthesis

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Malaysian families eat out very often because working parents do not have time to prepare home cooked food. These eating habits lead to many health problems.


9. a.. Based on the statement above, draw and label a diagram of cross section

of a leaf [ 4 Marks]

b. Explain how the leaf is adapted to optimise photosynthesis

[10 mark]

c. By using two examples, explain how plants from different habitats adapt

themselves to carry out photosynthesis [6 mark]

6.11 The Mechanism of Photosynthesis10.

Based on the statement above, explain the process of light reaction and dark reaction

6.16 The Factor Affecting Photosynthesisi. List down factors that affect the rate of photosynthesis [ 3 mark ]

ii. Explain that factor affect the rate of photosynthesis

[7 marks ]

6.17 Technological Development in Food Processing

12. (a) Describe the principles of food processing that may help your friend in deciding

a suitable food processing method

[10

marks]

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Photosynthesis occurs in green leaves. The leaf is adapted for optimal photosynthesis.

The process of photosynthesis is divided into two principal type of reaction, the light reaction and the dark reaction

Your friend intends to process a local food item to be exported as light snacks to overseas market. He wants some guidance on food processing so that his processed snacks can appeal to the overseas consumers, and at the same time he can make some profits.


Discuss the efforts taken to diversify our food production [10 marks]

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The population of Malaysia is at 27 million in 2007. The concern of Malaysia is

that her imported food has been gradually rising since 2000.

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Chapter 6 Student Edition