r
qto
FORM TP 2017045
TEST CODE
OI2O7O2O
-l
MAY/JUNE 2017
CARIBBEAN EXAMINATIONS COUNCIL
CARIBBEAN SECONDARY EDUCATION CERTIFICATE@
EXAMINATION
BIOLOGY
Paper 02
-
General Proficiency
2 hours 30 minutes
READ THE FOLLOWING INSTRUCTIONS CAREFULLY.
1.
This paper consists of SIX questions in TWO sections. AnswerALL questions.
2.
Write your answers in the spaces provided in this booklet.
3.
Do NOT write in the margins.
4.
Where appropriate, answers should be illustrated with diagrams.
5
If you need to rewrite any answer and there is not enough
6.
If you
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.
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 TO DO SO.
Copyright @ 2015 Caribbean Examinations Council
All rights reserved.
L-'.or,oro2o.
2or7
I
il]il
ilil til! tilt ilil lllll llll
lill llll
0120702003
llll
lil
lill
J
t-
-l
-4SECTION A
AnswerALL questions in this section.
..
Write your answers in the spaces provided in this booklet.
'.-.
::l
:r
:1_l
1.
.l
(a)
In an experiment, some students put corn seeds into each of two test tubes labelled A and
B, as shown in Figure l.
20"c
A
10
J
T
-J
_-f
+
"c
..1
B
a!
.i
-:-i
=
...
-..l
...
=
Moist cotton wool
Figure
1.
rji
i.t
Apparatus and materials used for experiment
.i
(i)
-
-li
---tt
,+
Write a suitable aim for this experiment.
.ea
-:!i
:j}:
:+
..ti
s
(2 marks)
(iD
In which of the tubes, A or B, would germination most likely occur? Give ONE
reason for your answer.
....\
=
z
.'-A
..\
l-s
..-....
(2 marks)
(iii)
State TWO roles that the moisture from the coffon wool plays in the process
of
germination.
---i--
.E
r.t
l+
.:fr
..tE
..>
t\
:-_A
Iffi
(2 marks)
GO ON TO THE NEXT PAGE
0t207020tr' 2017
L
I
il]il illt tilt tilt ilfl ll]t lffi tilt ilil uil tilt llll
0120702004
J
u
..4
--:=
'.fi
r
-l
-5(b)
The corn seedlings which germinated are placed in a pot and exposed to unidirectional
light as shown in Figure 2.
F
i-
I
t
h,
Cardboard box
r,
!.
Corn shoots
Light bulb
Desk lamp
Figure 2. Corn seedlings exposed to unidirectional light
-'i..
(i)
>..:
What type of movement is shown by the plants in Figure 2?
-\--
$..
(1 mark)
(iD
State a hypothesis that the students could test by using the apparatus and materials
shown in Figure 2.
(2
-l
*1:::
E.
ir-
(iii)
iAi-
\a-.-
!E--
*+'
mar;;;
The students want the seedlings to grow straight towards the ceiling. Suggest how
they could manipulate the apparatus to get this result.
E:,
N..
l!{i.
ttjj
x-l
;]
tr-.-.tr
I
(1 mark)
*l
GI
G.1
:--]
'l
-.t
' -l
11
j --t_l
''l
--..1
...
-l
l
-. --1
.-t
::1'--1
:------l
]
l
GO ON TO THE NEXT PAGE
01207020/F 2017
L
1
ilil ilil tilt tilt ilil lilfl !illl tilt !ilil t]il
0120702005
til
til
J
ffi
r
-6(iv)
-l
The seedlings shown in Figure 2 use all the nutrients stored in the cotyledons.
Discuss the process by which these plants can make more nutrients.
t
I
-i
.I
4
':
(4 marks)
(v)
i:
:-!
iti
Discuss the processes by which the raw materials required for making nutrients
reach the leaves of the plant.
..c
=
.{i
t
E
IL
-ri
---
't-t*
--)E
*
'i{
lE
-
(4 marks)
,:ti
€i
i-e
GO ON TO THE NEXT PAGE
0t207020/F 2017
L
r
ilil !ilr illl llll llll lill lllll llll llll illl lllllll
0120702006
I
t-
-7
(c)
F.
(i)
tt+
-l
-
Starch is the most coflrmon carbohydrate that is found in the leaves of green plants'
Describe a test that the students could do in the laboratory to investigate whether
starch is present in the leaves of the seedlings.
i,!f.
Ft,
+
>:
+
\
=
\
x
A:
(4 marks)
(ii)
Name ONE plant organ, other than leaves, where starch may be found.
(1mark)
(iii)
Instead of starch, animals store complex carbohydrates such as glycogen. Name
TWO organs in an animal's body which store glycogen.
$.
"si
(2 marks)
Total25 marks
GO ON TO THE NEXT PAGE
01207020/F 2017
L
I
fl]il
il]
ilil illt l]il lilt
ffi
il1il
ilil ilil ilr ilr
0120702007
J
r
2.
-l
-8Figure 3 represents the Whittaker Five-Kingdom Classification of living organisms
.Ir
3
,=
n
LIVING ORGANISMS
Type of cells
I+
i
-'t
:E
(i)
II
Eukaryote
,F
:{i
.\tr
Number of cells
.;
.F
Kingdom
Monera
Example: bacteria
2
(iD
Unicellular
Kingdom Protista
Presence of cell wall
(iiD
Example
No
Yes
(v)
Tlpe of Nutrition
Kingdom
:E
Example: fish
Autotroph
.-+-*-
ilt
\E
Heterotroph
:S+
+
(iv)
N
Kingdom Fungi
Kingdom
Example
:
:{*
yeast
Figure 3. Whittaker Five-I(ingdom Classification of living organisms
(a)
Complete the classification by writing the correct answers at (i), (ii),
Figure
(b)
3.
(iii), (iv)
and (v) in
(5 marks)
Each kingdom is further subdivided into taxa with the lowest rank being the level of
.+.
species.
.E'
(i)
-rrt
:tj..
-r*-
E
t\{
Define the term 'species'.
t
.\i
EI
.t!r
n+
,ix-.
.t*.
:\]
(2 marks)
GO ON TO THE NEXT PAGE
0t207020/F 2017
L
I
ll]lt
il]
lilt till ilil ll]t
ffi
lill illl
0120702008
llll
llil
llll
I
iffi
e
'-S.
:ft
.:-]j
a:
t-
-l
-9-
(ii)
i*j
Using the human species as an example, explain why physical appearance or
morphology isNOT always useful for identiffing organisms belonging to the same
.+.
species.
g1
!i+.'
G,
irk.'
5t
,.-$.
!r+'
*i.
S.i
-1
;1''
(2 marks)
t=--
ks.
(iiD
o':
a.
Suggest ONE reason why biologists use the biological concept of species instead
of physical characteristics to classiff organisms.
=
;"-'-
\i{*l-.
g'
---
(2 marks)
'.ir1.
:+;Ei
-1xi'
(c)
-|lii1
F*
.E..
lii.:
Some lizards were washed away on a log during a hurricane and landed on
Several years later, they were classified as a new species.
(i)
+t,
tiii:,\.'
.8.
-r*---
a
remote island.
Using the biological concept of a species, state TWO reasons why they were
reclassified.
.*.
..Q!.
el
.$.
q:
(2 marks)
(ii)
,.X-.
..f,t}.
..1*l
The new species of lizards living in the mountainous region of the island were
found to be smaller than those living on the lowlands. Suggest TWO reasons for
this variation.
:_----
.taj
.-I{.
.lt+--'
!r+.tlr.
..>.
.-Ei
.:E)'
.Ei.
r-J-r--'
.-fi'
i:ix-:-.
(2 marks)
..{-.'
--rA
--\r--
..ft
Total 15 marks
...s-l
..Q'
GO ON TO THE NEXT PAGE
012070208 2017
=
==
L
ffi
0120702009
J
r
3.
-l
- l0-
:l
t.
:.
..;
(a)
Figure 4 illustrates the events that take place during the human menstrual cycle.
=
:_-]
.I
O
q)
ar]
-i
Hormone Y
o
Hormone X
.F
-e
tr
.E
6l
(l)
9
U
I
0
2
4
3
Time (weeks)
@
Follicle develops
@
o!
Menstruation
ffi
A\
e#
Cornus ruteum
develops
(9
Z
..=
:.IQ
q
::ri
-fiE
o
rl5;
--*i
'hi
:ts
:Ei
q)
p
01234
+rl
-*.
Time (weeks)
:fi
s
*
(i)
Figure 4. Human menstrual cycle
'-L1
Identifu Hormones X and Y and the event occuning at Z.
:o
x
,t
r'.G
IQ
...............
Y ...............
Z
(3 marks)
(ii)
What is the role of EACH hormone in the menstrual cycle?
.r9a
x
.E
r_-k
.t*{.
.tsr.
.:e+
.-tri.
.-l\+
.-F4
iix-
Y.....
.-t-a.
(2 marks)
GO ON TO THE NEXT PAGE
012070208 20t7
L
ililtilil] lil il]tilfl ll]fl!ilililt ult illil]illll
0120702010
J
.-fr
..$.
1.ft.
r
-l
- 11-
(iiD
Name the organ that produces Hormones X and Y.
x
Y
(2 marks)
(i")
Discuss the fate of the following structures shown in Figure 4
the ovum occurs.
if fertillzation of
Corpus luteum
Uterus lining
(4 marks)
(b)
Some contraceptive pills contain hormones. Suggest how this may prevent pregnancy.
(1 mark)
(c)
A drug company is developing a male contraceptive
this could prevent pregnancy.
pill.
Suggest THREE ways in which
(3 marks)
Total 15 marks
GO ON TO THE NEXT PAGE
012070201F 2017
L
I
tilil
illt illl
illfl fllt illl lil lllll illl llil llll llll
0120702011
I
t-
-l
-12SECTION B
Answer ALL questions in this section.
Write your answers in the
spaces provided
in this booklet.
E
....\
4-
(a)
(i)
Explain how structures in the human eye control the amount of light that enters
the eye.
.+i
-A
:-ts)
,,fr
'.o
'.4
"ti
.-{-i.
:Irl'
..t_iii:.\..
.i{.
.-*-:.L=.
1Q.:
E
.:S.
.ei
(4 marks)
't;-.
E'
1*{.
t::.
.Ea.
FT''
.El
'ft+.
!*
i
.$.
GO ON TO THE NEXT PAGE
0t207020tr. 2017
L
r
ll]il
ut ilil illt uil tilil ilfl il]t tilt ilil
0120702012
ilil
til
J
Qr.
t-
-l
-13-
(iD
Jenny enters a dimly lit room and cannot see the colours of the furniture until the
lights are switched on. Explain how Jenny is able to discern objects in the dimly
lit room but cannot see the colours until the lights are switched on.
(5 marks)
GO ON TO THE NEXT PAGE
012070208 2017
L
I
il]il
il]
ilil
il!il ililt
ill lil
lllll
llll llill lil lill
0120702013
I
r
-l
-14-
.aa-_
(b)
A certain form of colour-blindness is inherited as a recessive allele carried on the X
chromosome. It is thus said to be 'X-linked'or'sex-linked'. Awoman with normal colour
vision, whose father is colour-blind, mates with a colour-blind man. What is the chance
of them having colour-blind children? Use a genetics diagram to explain your answer.
_i;
fti
fi
:v1
E
lli
Use B for the allele for normal vision and b for the allele for colour-blindness.
E
-.ha
.tt:
.{}:
.e
rA-j
.-\IJ--
-A-
..rr+
.6'
G..
(6 marks)
Total 15 marks
GO ON TO THE NEXT PAGE
ot2070201F 2017
L
ililililllllllllllllllllllillllllllllllllllllllfl llll
0120702014
J
aa:'
=
:'::
=
(t
if
r
s-
-l
-15(a)
Describe the chemical digestion of carbohydrates, fats and proteins from the mouth until
they are absorbed in the small intestines.
-+
a
!+
!r
:|r
i+
>:
-
H.
Ei
E.
llt
-t\r
'-\:*4
t
s
.-s1
::st
:-\t.
:III.
.Er
i..8,
:EI.
.-tr:
:Jrt::
::t!+
.ix-l
(6 marks)
GO ON TO THE NEXT PAGE
01207020/F 2017
L
ililil
ulilililuilil llllilililuilil ilil]il
0120702015
il
J
r
-l
-t6-
(b)
(D
Describe how the body systems work together to assimilate glucose molecules
::4
:,:E
jfi
.r-^i
,.-.-Y
,.-.4
---h
(4 marks)
(ii)
Explain how the assimilation of glucose by
of a person suffering from diabetes.
a
non-diabetic person differs from that
Total 15 marks
GO ON TO THE NEXT PAGE
012070208 20t7
I
ilil[!il
il]! ll]t ilil ilr !ilr rilr ilt ilfl til
0120702016
il
i.2.
.-lri
(5 marks)
L
.'iJ\
:-+*
- l+i:-Fi
:!i+-
J
=
.---l
t:
;i-1
r
6.
1':
-t7
(a)
-l
-
Using a suitable example of EACH, distinguish between a predator-prey relationship and
parasitism.
+r
*l
il
Li,
i_,
E.
+i
st
-i
-.\-
\.
!{l
>-i
l*I,
F+,
]l!r.
pa.
!--j
lra j
tsr:
ts+-
ts
f!!ij
f+,
F+l
s{.
txiL
E*'
.Gl
{.
ol
+
:-
(6 marks)
GO ON TO THE NEXT PAGE
0t207020tr. 20t7
L
ililil[]lilililililill ilil llilill ill
0120702017
lill
lil llll
J
ffi
t-
-l
-18(b)
Some environmentalists encourage the practice of introducing predators to an ecosystem
to control a population of pests rather than the use of agricultural chemicals.
(i)
Outline THREE advantages and THREE disadvantages of this method ofbiological
control compared to the use of chemicals.
.l:
n
r=
-u
.--E
.-Jat
rE
:l
.-1*
+i
,.t
:E
*.s
B
s
.E
:.4
.A
-L
'lA
:{isi
E
S*
E
:li+
lr1
.t*
-r:{iJ
'rt:
.E
rF
.t
.-€I
.O
.s
=
=rn
:-*
.trt
.!+
.*
ta.
'.tFi
++
t{
EEai*j{*il
'ltq.-
!+
ix1t-
(6 marks)
GO ON TO THE NEXT PAGE
01207020/F 2017
L
il!]il tilt tilt tilt ilil illl ull lilt til] ililil!il
0120702018
til
I
fi:,
r.I--
.e
r
-l
- 19-
(iD
Explain how biological control may conhibute to biological evolution through
natural selection in an ecosystem.
(3 marks)
Total 15 marks
END OF TEST
IF yOU FINISH BEFORE TIME IS CALLED, CHECK YOUR WORK ON THIS TEST.
L
ffi
01207020/F 20t7
0120702019
I