Bio/3/2021/E2B/p.1
Final Examination (2020-2021)
Subject: Biology
Secondary Three
Section A (Multiple Choice Questions):
1. C
11. C
2. C
12. A
3. B
13. C
4. C
14. A
5. B
15. D
6.
A
7.
C
8.
D
9.
D
10. D
Section B (Structured Questions):
Q1
(a) B
(b) E
(c) A
Q2
(a)
(b)
Q3
(a)
Dependent variable: the number of drops of fruit juice used to decolourize DCPIP solution
Independent variable: the type of fruit
Strawberry
(i) Prokaryotic cells: Cells D
Eukaryotic cells: Cells A, B and C
(ii) Any two of the following comparisons: (1 mark each)
Prokaryotic cells
- usually smaller in size
- without nucleus
- DNA lies free in the cytoplasm
- without membrane-bound organelles
- some with cell wall that is not made
of cellulose
(c)
1
1
1
1
1
1
1
1
2
Eukaryotic cells
- usually larger in size
- with a membrane-bound nucleus
- DNA enclosed in the nuclear
membrane
- with membrane-bound organelles
- some with cell wall made of cellulose
X is the nucleus.
It contains the genetic material / DNA.
It controls all cellular activities.
1
1
1
Q4
(a)
(b)
(c)
(d)
i
Non-vegetarian diet
1
ii
Non-vegetarian diet generally contains meat
1
Dairy products / milk and eggs
1m x 2
It can stimulate peristalsis of our alimentary canal and thus prevent constipation. or
Prevent overweight / obesity or
They help reduce the risk of heart attack / stroke.
1m x 2 (any 2)
The strict vegetarian diet contains less proteins. It may not be able to supply enough proteins
for the growth of young children.
P.T.O.
1
1
Bio/3/2021/E2B/p.2
Q5
(a)
(b)
Z
The digestion of Z begins in the mouth cavity.
Starch is broken down into maltose by salivary amylase.
Region Q is very long. This allows sufficient time for the absorption of digested food. /
1
1
1
There are numerous finger-like villi in its wall. / Its epithelial cells have
a large number of microvilli. This provides a large surface area for food absorption. /
Its epithelium is very thin / one cell thick. This provides a short distance for diffusion. /
There are lacteal and network of capillaries in the villi. This allows absorbed food molecules to be
carried away quickly. /
(c)
Peristalsis occurs. This brings the digested food molecules into close contact with the villi for
absorption.
(any 2)
2×2
Large intestine / colon.
1
It absorbs some of the remaining water from the remains of food.
1
OR
Rectum.
1
It stores faeces temporarily.
1
Q6
(a)
(b)
i Q
ii
S
iii
P
Canines are pointed and curved
for tearing flesh.
1
1
1
1
1
End of paper
P.T.O.