Form 3 Chapter 5

Form 3 Science Chapter 5

FORM 3 CHAPTER 5 GROWTH Diagram 1 shows the human growth curve based on body mass.

Body mass (kg)

1.

Diagram 1

(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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Form 3 Science Chapter 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 Science Chapter 5

2.

Diagram 2 shows the human growth curve.

Diagram 2 (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: ……………………………………………………………………………………… JPN Pahang 2009

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Form 3 Science Chapter 5

[2 marks] 3.

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

P: …………………..

Q:…………………..

R: ………………….. S: …………………..

Diagram 3 (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. Class of food

Importance Provides energy for children to carry out activities

Proteins

Helps to move a child’s bowels

Carbohydrates

To repair damaged tissues and promote growth

Fibre

[3 marks] JPN Pahang 2009

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