csec biology 3 jan 2016
TRANSCRIPT
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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
GO
ON TO
THE NEXT
PAGE
OLO
03
JA
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2016
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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
GO ON TO TH E N XT PAGE
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r
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
GO ON
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
GO ON TO THE
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)
GO ON TO TH N XT PAGE
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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)
GO ON TO THE NEXT PAGE
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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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