Form 3 ScienceChapter 5

FORM 3 CHAPTER 5GROWTH

1. Diagram 1 shows the human growth curve based on body mass.

(a) On Diagram 1, label the curves that represent the growth of a male and a female.

[2 marks](b) At what age range is

(i) the body mass the same for male and female?

………………………………………………………………………………………………..

[1 mark] (ii) the body mass gain in male faster than the female?

………………………………………………………………………………………………...

[1 mark] (iii) the body mass gain in female faster than male?

..……………………………………………………………………………………………...

[1 mark]

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Diagram 1

Bod

y m

ass

(kg)

Form 3 ScienceChapter 5

(c) At what age do boys begin to develop their sexual characteristics?

………………………………………………………………………………………………….

[1 mark]

(d) Adolescents require a lot of carbohydrates in their diet. Explain why.

…………………………………………………………………………………………………

[1 mark]

(e) Besides body mass, state another physical quantity that can be used to compare and contrast the growth rates of humans.

…………………………………………………………………………………………………..

[1 mark]

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Form 3 ScienceChapter 5

2. Diagram 2 shows the human growth curve.

(a) Identify the stages labelled P: ………………………………………………………………………………………………

R: ………………………………………………………………………………………………

S: ………………………………………………………………………………………………

[3 marks]

(b) Name the stage at which the human growth rate is

(i) negative.

……………………………………………………………………………………………….

(ii) most rapid.

……………………………………………………………………………………………….

[1 mark]

(c) Apart from an increase in mass and height, state one physical change that takes place in a male and a female at stage R.

Male: ………………………………………………………………………………………….

Female: ………………………………………………………………………………………

[2 marks]

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Diagram 2

Form 3 ScienceChapter 5

3. Diagram 3 shows the different stages in the growth of a human being.

(a) Name the stages of growth in Diagram 3.

[4 marks]

(b) Describe the growth rate at P.

…………………………………………………………………………………………………

[1 mark]

(c) Children need nutritious food for healthy growth. Draw lines to match the classes of food to their importance in children’s growth.

[3 marks]

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P: ………………….. Q:………………….. R: ………………….. S: …………………..

Diagram 3

Class of food Importance

ProteinsProvides energy for children to carry out activities

Helps to move a child’s bowels

FibreTo repair damaged tissues and promote growth

Carbohydrates