Perfect Score Bio Answer

PERFECT SCORE BIOLOGY 2011

BAHAGIAN SEKOLAH BERASRAMA PENUH DAN
SEKOLAH KLUSTER
KEMENTERIAN PELAJARAN MALAYSIA

PERFECT
SCORE
BIOLOGY

2011

Teacher’s Module

1

PERFECT SCORE BIOLOGY 2011
Paper 2 – Section A:
Structural Questions
1.

Marks

Student notes Diagram 1.1 shows a somatic cell of an insect undergoing meiosis.
Process X

R: Centromere
Q: Chromosome/ chromatid S: Nuclear membrane Diagram 1.1
(a)

Label Q, R and S in Diagram 1.1.
[3 marks]

(b)

3m

In the space below draw chromosome behaviour during metaphase I and metaphase II.

2m
Metaphase I

Metaphase II

[2 marks]

2

PERFECT SCORE BIOLOGY 2011
(c)

Explain how the process X involves in producing variation in organisms.
P1 - During prophase Meiosis 1, crossing over occurs between homologous chromosomes
Any
3=3m

P2 - resulting a new genetic combination.
P3-

(d)

It is also producing the exchange of genetic material between paternal chromosome and maternal chromosome // between homologous chromosomes.
[3 marks]

Diagram 1.2 shows the formation of an ovum.

Oogonium (2n)

Primary oocyte (2n)

M
M
First polar body
(n)

Secondary oocyte
(n)

N
N

Second polar body
(n)
Diagram 1.2
(i)

What are process M and N?
M : Meiosis I
N : meiosis II
[2 marks]

(ii)

2m

Describe the process that occurs if a sperm present at process N.
P1: meiosis II completed // ovum form
P2: (nucleus) ovum is fertilized by sperm nucleus
2m

P3 : zygote is form
[2 marks]

3

PERFECT SCORE BIOLOGY 2011
2.

Diagram 2 shows the digested food is being carried from small intestine to the liver and body cell.

Diagram 2

(a)(i)

Name process X at the villus.
Absorption
[1 mark]

(ii)

1m

Explain ONE adaptation of the villus for the process in (a)(i).
F : Has thin wall//one cell thick wall
E : Diffusion of nutrient occurs rapidly //

F: Has network of blood capillary

1F=1m
1E=1m

E :