The organisms A, B and C can obtain their food in three different ways. Organism A derives its food from the body of another living organism which is called its D, without killing it. The organism B takes in the solid food by the process of ingestion, digests a part of this food and throws out undigested food in the process called E. The organism C obtains its food from dead and decaying plants.
(a) What is the mode of nutrition of (i) organism A (ii) organism B, and (iii) organism C?
(b) What is the organism like D called?
(c) Name the process E.
(d) Give one example each of organisms like (i) A (ii) B, and (iii) C.
(e) What is the general name of three modes of nutrition exhibited by organisms A, B and C?

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Solution

(a) (i) Organism A has parasitic mode of nutrition, (ii) organism B has holozoic mode of nutrition and (iii) organism C has saprophytic mode of nutrition.

(b) The organisms like D are called hosts.

(c) The process E is egestion.

(d) The example of organisms like (i) A is Cuscuta, (ii) B is cow and (iii) C is mushroom.

(e) The general name of the three modes of nutrition exhibited by organism A, B and C are parasitic nutrition, holozoic nutrition and saprophytic nutrition, respectively.

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