A , B and C are three living organisms. The organism A is a unicellular fungus which can live without air. It is used in the commercial production of an organic compound P from molasses. The organism B is a unicellular animal which lives in water and feeds and moves by using pseudopodia. It breathes through an organelle Q. The organism C is a tiny animal which acts as a carrier of the malarial parasite. It breathes and respires through a kind of tiny holes R and air-tubes S in its body.
(a) What are organisms (i) A (ii) B, and (iii) C?
(b) Name (i) P (ii) Q (iii)R, and (iv) S.
(c) Which organism/organisms undergo aerobic respiration?
(d) Which organism/organisms undergo anaerobic respiration?

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Solution

(a) A is yeast, B is an amoeba, C is mosquito(specifically female Anopheles mosquito)

(b)P is ethyl alcohol/ ethanol, Q is cell membrane (as amoeba breathes through the cell membrane), R are spiracles, S are tracheal tubes

(c)mosquito and amoeba have aerobic respiration

(d)yeast undergo anaerobic respiration.

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