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 (ii) 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) Parasitic (ii) Holozoic (iii) Saprophytic

(b) Host

(c) Egestion

(d) (i) Tapeworm (ii) Man (iii) Mushroom

(e) Heterotrophic nutrition

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Q. The partially digested food coming from the stomach of a person enters a long and narrow organ A in his body. The organ A receives the secretion of two glands : liver and pancreas. Liver secretes a greenish-yellow liquid B which is normally stored in the organ C. Pancreas secretes pancreatic juice which contains three digestive enzymes D, E and F. The intestinal juice completes the process of digestion of food. The inner wall of organ A has millions of tiny finger-like projections G which help in the rapid absorption of digested food into blood stream. The undigested part of food then passes into wider tube H which absorbs most of the water from undigested food. The last part of tube H called I stores this undigested food (or waste) for some time. The undigested food is then passed out though opening J as faeces in the process known as K.
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There are four organisms A, B, C and D. The organism A eats only the flesh of other animals as food. The organism B can eat grains, fruits and vegetables as well as meat and fish. The organism C can make the food itself from simple inorganic substances present in the environment by utilising sunlight energy. On the other hand, organism D eats only plants and their products as food.
(a) Which organism is (i) omnivore (ii) herbivore, and (ii) carnivore?
(b) Which organism is an autotroph?
(c) Which organism is/are heterotroph(s)?
(d) Which organism can be a producer?
(e) Which organism is/are a consumer (s)?
(f) Give one example each of organisms which could be like (i) A (ii) B (iii) C, and (iv) D

Q. Holozoic nutrition is a mode of nutrition in which organisms take in food from outside and digest it inside their bodies.

Q. Which of the following is a mode of nutrition in which organisms take in food from outside and digest it inside their bodies?

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(a) (i) Parasitic (ii) Holozoic (iii) Saprophytic (b) Host (c) Egestion (d) (i) Tapeworm (ii) Man (iii) Mushroom (e) Heterotrophic nutrition

(a) (i) Parasitic (ii) Holozoic (iii) Saprophytic

(b) Host

(c) Egestion

(d) (i) Tapeworm (ii) Man (iii) Mushroom

(e) Heterotrophic nutrition