GA. Atoll School / First term test 2011 Grade 8/ Biology

First TERM EXAMINATION- 2011

G. A. Atoll School, kolamaafushi

Biology/ Grade 8

2 hours 30 mins Date: 19th may 2011

READ THESE INSTRUCTIONS FIRST

Do not use staples, paper clips, highlighters, and glue or correction fluid.

Write your name, class and index on the answer sheet in the spaces provided.

Answer all the questions.

Write your answers in the spaces provided on the Question Paper.

This paper consists of two sections.

The number of marks is given in bracket ( ) at the end of each question or part question.

Total marks for this paper is 100.

At the end of the examination, fasten all your work securely together.

This document consists of 15 printed pages

Name: Class: Index:

GA. Atoll School / First term test 2011 Grade 8/ Biology

Section A

Choose the correct letter and circle the letter (30 marks)

1. A chemical molecule contains sulphur and phosphorous. Which of the following could it

be?

A. A carbohydrate B. A fatty acid C. A protein D. Glycerol

2. Which processes moves sugar from leaf cells into phloem tissue?

A. Active transport B. Osmosis C. Diffusion D. Photosynthesis

3. Respiration in living organisms always involves?

A. Oxygen consumption C. Carbondioxide production

B. Energy release D. Gaseous exchange

4. Which of the substances must be present in the soil for the growth of a healthy green

plant?

A. Glucose B. Amino acid C. Carbondioxide D. Magnesium

5. Which structures in a plant cell contain DNA and cellulose?

DNA Cellulose

A

B

C

D

Cell wall

Chloroplast

Cytoplasm

Nucleus

Cytoplasm

Nucleus

Chloroplast

Cell wall

6. Some substances in living organisms move by active transport. Which line is correct for

active transport?

A. Movement of substances from low concentration to high concentration by using

energy.

B. Movement of substances from low concentration to high concentration without using

energy.

C. Movement of substances from low concentration to low concentration by using

energy.

D. Movement of substances from low concentration to low concentration without using

energy.

GA. Atoll School / First term test 2011 Grade 8/ Biology

7.

8.

9. Starch is an example of :

A. Monosaccharide B. Lipids C. Disaccharides D. Polysaccharides

10.

A. Petals B. stem C. root D. flower

11. Which feature helps plants to make most food by the process of photosynthesis?

A. Spiky leaves C. Shiny surfaced leaves

B. Broad and flat leaves D. Variegated leaves

GA. Atoll School / First term test 2011 Grade 8/ Biology

12. Starch is digested to maltose by the enzyme amylase.

According to ‘lock’ and ‘key’ hypothesis, which is the ‘key’ and which is the ‘lock’?

‘key’ ‘lock’

A

B

C

D

Amylase

Amylase

Starch

Starch

Maltose

Starch

Amylase

Maltose

13.

A. Roots B. flowers C. leaves D. fruits

14.

15. Which chemical change takes place in green plants but not in mammals?

A. Glycogen into glucose C. Glucose into cellulose

B. Starch into glucose D. Glucose into glycogen.

GA. Atoll School / First term test 2011 Grade 8/ Biology

16. What is the function of each type of plant cell?

Palisade cell Phloem cell Root hair cell

A Photosynthesis Sugar transport Ion uptake

B Photosynthesis Sugar transport Transpiration

C Transpiration Photosynthesis Ion uptake

D Transpiration Photosynthesis Sugar transport

17. Which one of the following chemical elements is needed for the proper growth of roots?

A. Calcium B. Iron C. Phosphorous D. Magnesium

18. The sum of all chemical reactions that takes place in a living organisms is

called………………….

A. Anabolism B. Metabolism C. Catabolism D. Respiration

19. Which one of the following is the function of stomata?

A. Carries water and mineral salts.

B. Allows for gaseous exchange between the air spaces

C. Main site of photosynthesis

D. Protects the plant against diseases

20. The cells of green plants make their food from simple inorganic materials. In what form

does this food being stored in the plants?

A. As glucose B. As starch C. As protein D. As mineral

21. What is the function of skeletal tissue?

A. Sets up nerve impulses.

B. Binds and strengthens around the body

C. Supports and protects softer tissues and allows movement

D. Lines tubes such as gut and covers surface such as skin

22. Some molecules change the likelihood of an enzyme being able to bind to its substrate.

Which one of the following makes this binding more likely?

A. Products B. Activators C. Inhibitors D. Proteins

23. Atmospheric carbondioxide converted into carbohydrates by

A. Combustion C. Respiration

B. Decomposition D. Photosynthesis

GA. Atoll School / First term test 2011 Grade 8/ Biology

24. The diagram shows one type of a plant cell.

What type of a cell is it?

A. Epidermal cell of a leaf C. Root hair cell

B. Mesophyll cell of a leaf D. Xylem cell

25. Which two structures are found only in plants?

A. Cytoplasm and cell membrane C. Cell wall and sap vacuole

B. Nucleus and sap vacuole D. Chloroplast and cell membrane

26. The diagram shows a plant cell as seen under a microscope.

What are the functions of numbered parts?

Control the entry of substances

Synthesis of carbohydrates

A

B

C

D

1

2

3

3

3

1

2

1

27. Which of the following is the subunit of protein?

A. Glucose B. Protein C. Glycerol D. Nucleotides

28. Which gas is released during respiration?

A. Oxygen C. Hydrogen

B. Nitrogen D. Carbondioxide

1

2

3

GA. Atoll School / First term test 2011 Grade 8/ Biology

29.

30.

GA. Atoll School / First term test 2011 Grade 8/ Biology

Section B

1. The diagram below shows the internal structure of leaf

a) Label the diagram above. [6m]

A………………………….……….... D………………………………….

B……………………………………. E………………………………….

C……………………..……………... F…………………………………..

b) Which of the structures labeled on the diagram

i) Is where most photosynthesis takes place? [1m]

……………………………………………………………………………………………………

ii) Which of the structures contain chloroplasts? [1m]

……………………………………………………………………………………………………

iii) Name the pigment found in the chloroplasts and write its function. [2m]

……………………………………………………………………………………………………

……………………………………………………………………………………………………

[Total: 10 marks]

2. a) List the characteristics of living things [3m]

………………………………………………………………………………………………………

……………………………………………………………….………………………………………

A

B

C

D

E

F

GA. Atoll School / First term test 2011 Grade 8/ Biology

b) Carbohydrates consist of Carbon, Hydrogen and Oxygen. What additional elements

are needed to covert a carbohydrate into a protein? Where do you think the plant get

those elements from? [2m]

…………………………………………………………………………………………………

………………………………………………………………………………………………….

c) Write the subunits of the following molecules. [3m]

i) Carbohydrates……………………………………………………………………………..

ii) Nucleic acids………………………………………………………………………………..

iii) Lipids ………………………………………………………………………………………

3. Write the name and functions of the following cells. [Total:4 marks]

a)

b)

4. a) The diagram below shows the process of osmosis

Name:………………………………………

Function:……………………………………

………………………………………………

………………………………………………

………………………………………………

Name:………………………………………

Function:……………………………………

………………………………………………

………………………………………………

………………………………………………

Region A Region B

Key:

Water

Salt

GA. Atoll School / First term test 2011 Grade 8/ Biology

i) Label the membrane with the letter C. [1m]

ii) State the region where the water potential is high. [1m]

…………………………………………………………………………………………………

iii) What is the meaning of semi-permeable membrane? [1m]

…………………………………………………………………………………………………

…………………………………………………………………………………………………..

iv) On which way would be the net flow of water? [1m]

…………………………………………………………………………………………………

…………………………………………………………………………………………………..

v) Define the term ‘osmosis’ [2m]

…………………………………………………………………………………………………

…………………………………………………………………………………………………

b)

i) Describe the water potential of the liquid. [2m]

……………………………………………………………………………………………………

……………………………………………………………………………………………………

…………………………………………………………………………………………….………

ii) Explain the effect of water potential of the liquid on the cells. [2m]

………………………………………………………………………………………………………

………………………………………………………………………………………………………

………………………………………………………………………………………………………

[Total : 10 marks]

GA. Atoll School / First term test 2011 Grade 8/ Biology

5. The diagram shows the stages in testing a green leaf for starch.

The stages are not in correct order.

a) Place the letters of the stages in the correct order by writing the letters in the boxes.

The last stage has been completed for you. [4m]

b) Give the reason for each of the following stages: [3m]

i) Stage C

…………………………………………………….............................................................

ii) Stage B

………………………………………………………………………………………………

iii) Stage E

………………………………………………………………………………………………..

Leaf rinsed in

water

GA. Atoll School / First term test 2011 Grade 8/ Biology

c) What is the positive result for iodine test for starch?

………………………………………………………………………………………………[1m]

[Total: 8 marks]

6.

b) Name the storage organelle found in animal cell and plant cell.

……………………………………………………………………………………………….…[2m]

c) The storage molecules of these cells come under which type of biological molecule?

………………………………………………………………………………………...……[1m]

d) Name an animal cell which does not have a nucleus.

……………………………………………………………………………………..….……[1m]

e) In which part of the cell does chemical reaction takes place?

……………………………………………………………………………………………..[1m]

[Total: 8 marks]

GA. Atoll School / First term test 2011 Grade 8/ Biology

7.

GA. Atoll School / First term test 2011 Grade 8/ Biology

c)Explain the ‘lock’ and ‘key’ hypothesis of the enzyme reaction.

………………………………………………………………………………………………………

………………………………………………………………………………………………………

………………………………………………………………………………………………………

…………………………………………………………………………………………………[4m]

[Total: 13 marks]

8. Define the following:

a) Diffusion

………………………………………………………………………………………………………

………………………………………………………………………………………………………

…………………………………………………………………………………………………[2m]

b) Multicellular organism

………………………………………………………………………………………………………

…………………………………………………………………………………………….……[1m]

c) Catabolism

………………………………………………………………………………………………………

………………………………………………………………………………………………….[1m]

d) Respiration

………………………………………………………………………………………………………

…………………………………………………………………………………………………[1m]

[Total: 5 marks]

9. Answer any one of the following questions. [4m]

a) Explain how you would carry out the experiment to ensure that chlorophyll is

necessary for photosynthesis.

b) Explain how xylem vessels are adapted for their function.

GA. Atoll School / First term test 2011 Grade 8/ Biology

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All the best