2.2 Living Processes in Unicellular Organisms

Question 1

Unicellular organisms

Answer 1

• made up of only one cell

- Ameoba sp. and Paramecium sp.

Question 2

Amoeba sp.

Answer 2

Habitat: Freshwater and damp soil

Structural characteristics:

Can change shape
Has one nucleus
Has contractile vacuole and food vacuole

Respiration: Simple diffusion

Feeding: Phagocytosis

Movement: Extend its pseudopodium

Reproduction:

Binary fission (favourable condition)
Spore formation (unfavourable condition)

Excretion: Osmoregulation through contractile vacuole

Question 3

Paramecium sp.

Answer 3

Habitat: Freshwater

Structural characteristics:

Slipper-shape
Has cilia
Has two nuclei; macronucleus and micronucleus
Has contractile vacuole and food vacuole

Respiration: Simple diffusion

Feeding: Oral groove

Movement: Beats the cilia

Reproduction:

Binary fission (favourable condition)
Conjugation  (unfavourable condition)

Excretion: Osmoregulation through contractile vacuole