CSEC Biology 3 Jan 2016

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TEST CODE 12 7 32

ORM

TP

2 16 3

®

JANUARY 2016

C R I B B E AN E X AM I NAT I 0 N S

c

0 U N C I L

CARIBBEAN SECONDARY EDUCATION CERTIFICATE®

EXAMINATION

BIOLOGY

Paper

032 - General Proficiency

Alternative to SBA

hours 1

minutes

READ THE

FOLLOWING

INSTRUCTIONS CAREFULLY.

1. Answer ALL questions.

2. Use this answer booklet when responding to the questions. For EACH question,

write your answer in the space provided and return the answer booklet at the end

of

the examination.

3. Do

NOT

write

in

the margins.

4. ou are advised to take some time to read through the paper and plan your answers.

5.

If

you need to rewrite any answer and there is not enough space to do so on the

original page, you must use the extra lined page s) provided at the back of this

booklet. Remember to draw a line through your

original

answer.

6. f you use the

extra

page s), you MUST write the

question

number

clearly

in

the box

provided

at the top of the extra page s) and where relevant include

the question part beside the answer.

DO NOT TURN THIS PAGE UNTIL

YOU

ARE TOLD DO SO.

Copyright©

2014 Caribbean Examinations Council

All rights reserved.

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1.

a)

-

4-

Answer ALL questions.

Write your

answers

in the spaces provided in

this

•booklet.

i) Place the fish on the wh ite tile laying it on its side. Measure the

distance

from

the mouth

to

the operculum

gill cover).

2 marks

ii) Raise the opercu lum and gently remove the gills. Place an intact gill in the petri

dish with water. Use the hand lens to carefully observe the gill.

In

the space

below, make a clearly labelled drawing to show the visible structures of the gill.

Label EACH

ofthe

following:

gill raker; gill lamellae; gill

bar

.

5

marks

b) Explain

TWO

ways in which the gills of the fish are similar to the lungs of a human.

4

marks

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d)

e)

- 6 -

ii) Write a conclusion that could be drawn from the data presented n Figure 1

• 0 0 0 0 0 0 • 0 0 •

• • 0 0 0 0 0 . 0 0 0 0 0 0 0 • • • •

.

• • 0 •• 0 •

• 0 • • 0 • • 0 0 0 0 • • •

2 marks)

Explain how temperature may affect the breathing rate of fish.

2 marks)

Suggest TWO

OTH R

factors that may affect the breathing rate

of

the fish living n this

environment.

2 marks)

Tota121 marks

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2. Figure 2 shows the early growth

of

a

pea

seedling after germination .

Soil surface

L-------

----.J

D Y

1

2

3

4 5

6

7

8

Figure 2. Germination

of

a

pea

seedling

a) i) Measure the lengths of the

roots

from the soil surface to the root tips from

Day

2

to Day 8.

Record these measurements

n

a suitably constructed table

n

the space below.

4 marks

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TO

THE

NEXT

PAGE

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c)

d)

- 10

Some students want to investigate the effect

oflight

direction on the growth of he seedling

at

Day 8.

•

i) Describe the procedure they could use to

conduct

their investigation .

3 marks)

ii) Describe a suitable control for this investigation.

2 marks)

How

does the usual response to light,

shown

by the shoots

of

green flowering plants,

benefit the plant?

2 marks)

Total 17 marks

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NEXT

PAGE

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3.

- -

John observes that leftover pineapple kept at 15

oc

in the refrigerator tastes sweeter than pineapple

consumed

just

after being peeled (at room temperature). He thinks that this occurs because of

an enzyme, which acts at the lower temperature to hydrolyse the o r e sucrose to glucose and

fructose.

(a) State a hypothesis that could be tested to explain John s observation.

2 marks)

(b) Describe an experiment that could be used to test the hypothesis stated

in

(a) above. Write

your answer under the following headings:

Equipment and materials

3 marks)

Procedure

4 marks)

GO ON TO THE

N XT

PAGE

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- 12 -

c) State

ON

precaution and

ON

limitation for this experiment.

•

Precaution ................... ....... ......... ........ .... .................... ..... .......................... ................... ..

Limitation ....... .... ................................................ ...... ....... ... ........ ............. ..... .......... .......

2 marks)

d) In the space below, produce a table to

show how

the data from the experiment could be

captured. Insert a title for the table and appropriate headings . You are

OT

required

to input data n the table.)

3 marks)

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- 3 -

(e)

Explain how the expected results could be used to support the hypothesis.

2 marks)

t) Outline how the experiment described in (b) on page

II

could be modified to determine

the effect of pH on the enzyme s activity.

3 marks)

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14

g) Figure 4 shows the data obtained from an investigation.

i)

2 0

4 0

pH

6 0

Figure 4. Effect of pH

on

the rate

of enzyme

activity

Deduce the optimum pH for the activity of EACH enzyme, A and B.

8 0

Enzyme A ................................. ..... ....... ........

.......... ..................................... .......

.

Enzyme 8 ............................................................ ..... .... .... ....... ............ ........ ....... .

2 marks

GO ON TO

THE NEXT

PAGE

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CSEC Biology 3 Jan 2016