Question

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.

1. What is the mode of nutrition of (i) organism A (ii) organism B, and (iii) organism C?
2. What is the organism like D called?
3. Name the process E.
4. Give one example each of organisms like (i) A (ii) B, and (iii) C.
5. What is the general name of three modes of nutrition exhibited by organisms A, B and C?

Answer 1

(a)

1. Organism A: Parasitic nutrition
2. Organism B: Holozoic nutrition
3. Organism C: Saprophytic nutrition

(b) The organisms like D are called hosts.

(c) The process E is egestion.

(d)

1. Organism A (Parasite): Cuscuta (Amarbel), Lice, or Tapeworm.
2. Organism B (Holozoic): Human, Amoeba, or Tiger.
3. Organism C (Saprophyte): Mushroom, Bread mould, or Yeast.

(e) The general name is Heterotrophic nutrition. These are all modes of nutrition where organisms cannot manufacture their own food and must depend on other organic sources for energy.