UNIT 3: Kingdom Protista (amoeba)

Question 1

Protista

Answer 1

Eukaryotic

Includes algae, seaweeds, amoeba

Question 2

Structure of amoeba

Answer 2

• single celled
• no definite shape
• cytoplasm is composed of thin viscous outer layer called the ectoplasm and a more fluid internal endoplasm
• possesses pseudopods for movement and feeding
• contains fat droplets and food vacuoles that give the endoplasm a granular appearance,
• possesses contractile vacuoles that carry out osmoregulation

Question 3

Osmoregulation in amoeba

Answer 3

• water is always moving into fresh water amoeba due to osmosis.
• if this water is not removed from the cell, the amoeba would burst.
• amoeba removes this water by actively pumping (using ATP) water into a contractile vacuole.
• when the contractile vacuole reaches a certain size it fuses with the cell membrane and release water outside the cell