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.?

Answer:
Contractile vacuoles are involved in osmoregulation.

Question 2:
How does the Amoeba sp. move?

Answer:
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?

Answer:
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.

Answer:
The contracting rate of the contractile vacuole will decrease.