Formative Practice 6.1 – Form 4 Science (KSSM) Chapter 6


Question 1:
State the importance of a support system.

Answer:
Support system is important to ensure that animals are able to move smoothly and efficiently.


Question 2:
Explain the meaning of exoskeleton, endoskeleton and hydrostatic skeleton.

Answer:
The exoskeleton is a frame made of waxy chitin or shell. The endoskeleton is a skeleton made up of bones or cartilages.

Hydrostatic skeleton is a skeleton consisting of muscular walls covering a certain body cavity filled with fluid.


Question 3:
Explain the growth curve of an animal with exoskeleton.

Answer:
The growth curve of exoskeleton animals is in stages.

The exoskeleton is made up of wax chitin that is hard and cannot expand. Therefore, the growth of animals is hindered.

To overcome this problem, exoskeleton animals will moult a few times to reach adulthood.


Question 4:
What is the meaning of ecdysis?

Answer:
Ecdysis is a process where animals with exoskeleton shed their outer layer shell during growth.


Question 5:
State the two factors that affect the stability of an animal.

Answer:
Centre of gravity and base area


Question 6:
(a) What is centre of gravity?
(b) What is the relationship between the height of an object and its stability?

Answer:
(a)
Centre of gravity refers to the point of equilibrium of animals, plants or objects.

(b)
The higher the position of an object, the higher the centre of gravity. A higher centre of gravity causes an object to be less stable.

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