Formative Practice 2.2 (Form 4 Biology Textbook Exercise and Answer)

Question 1:
What is the function of the contractile vacuole in a Paramecium sp.?

Contractile vacuoles are involved in osmoregulation.

Question 2:
How does the Amoeba sp. move?

Amoeba sp. moves by extending its pseudopodium (false feet). This is followed by cytoplasmic streaming into the extended pseudopodium.

Question 3:
How does the Amoeba sp. reproduce when the environment is unfavourable?

Amoeba sp. forms spores. In the spores, mitosis takes place multiple times to form daughter cells.
Once environmental conditions improve, the spores will germinate and release daughter cells.

Question 4:
Predict what will happen to the contractile vacuole if the Paramecium sp. is placed in a concentrated salt solution.

The contracting rate of the contractile vacuole will decrease.

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