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SCIENCE SPM

MODULE 2

PAPER 1

1. What is the name of the fine thread-like structure found in the nucleus of the cell?

A Gene

B Chromosome

C Cell membrane

D Nuclear membrane

2. The chromosomes present in the female skin cells are

A 22 + Y

B 22 + X

C 44 + XX

D 44 + XY

3. Diagram shows the different phases in cell division in mitosis.

Which is the correct sequence in the mitosis?

A P, Q, R, S

B S, P, R, Q

C R, S, Q, P

D Q, R, P, S

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4. Which part of a plant does meiosis occur?

A Root

B Shoot

C Anther

D Stigma

5. What is the function of cell division through meiosis?

A Produces more siblings

B Replaces damaged tissues

C Increases the size of an organism

D Creates variation in a population of organisms

6. What type of cell division process human occurs only in the reproductive organs?A Mitosis

B Meiosis

C Mutation

D Fertilization

7. Diagram shows the inheritance of human height.

Father Mother

Which offspring has a correct pair of genes?

Offspring Pair of genes

A P Tt

B Q TT

C R TT

D S tt

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8. The graph shows an example of variation among the pupils in a class.

Another example of the same type of variation is

A blood group

B body weight

C type of fingerprint

D type of ear lobes

9. Which is caused by gene mutation?

A Colour blindness

B Downs syndrome

C Turners syndrome

D Klinefelters syndrome

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2. Diagram 2 shows the abnormal chromosomes arrangement that can be found in human.

DIAGRAM 2

(a) How many chromosomes in the Diagram 2?

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[1 mark]

(b) Name one disease due to the genetic disorder in Diagram 3?

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[1 mark]

(c) State one symptom of the disease in 3(b)?

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[ 1 mark]

(d) State either male or female will get this disease?

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[1 mark]

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(e) Tick ( ) the disease caused by gene mutation.

AlbinismAlbino

Down SyndromeSindrom Down

Colour BlindnessButa Warna

[2 marks]

3. (a) State four differences between cell division through mitosis and meiosis.

[4 marks]

(b) The cell division that takes place in the body parts of a student is shown above. Explain

how you would build a concept based on the information above. Your explanation should

include the following.

(i) Identify two common features(ii) Build an initial concept

(iii) Give one example of body part that undergoes this cell division and one example of

body part that does not undergo this cell division. Give reason for each example.

(iv) Explain the actual concept [6 marks]

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MODULE 2 - ANSWERS

1. B

2. C

3. D

4. C

5. D

6. B

7. D

8. B

9. A

10. D

1.

(a) Meiosis

(b) Replication of chromosome // Exchange genetic materials

(c) Testis and ovary

(d) To produce gametes // ensure the number of chromosomes in an organisms being kept

constant from one generation to another generation.

(e) Anther // ovary

2. (a) 45 chromosomes

(b) Turners Syndrome

(c) Under develop ovary // no menstrual cycle // sterile

(d) Female

(e)

Albinism

Albino

Down Syndrome

Sindrom Down

Colour Blindness

Buta Warna

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a)Mitosis Meiosis

Cell division happens once Cell division happens twice Crossing over does not occur Crossing over occur Two new cells are produced Four new cells are produced

The number of chromosomes in progeny is similar to parent cell

The number of chromosomes in progeny is half of the parent cell

b)

Two common characteristics

cell division occurs in somatic cell

cell division produces two daughter cells

cell division for growth

Initial concept

Cell division which occurs in somatic cells and produces two daughter cells is mitosis

Other example

Heart because it is a somatic cell

Non-example

Testis / Ovary because it is a reproductive cell

Actual concept

Mitosis is cell division which occurs in somatic cells and produces two daughter cells