Question

(a) I am tall but I cannot move. I am green and prepare my own food. Tree, autotroph (b) I live in water; People keep me in aquarium and feed me. _________, __________. (c) I am small and I can fly. I disturb you sleep, bite you and suck your blood which is my food. ___________, ______________ (d) I am white and soft. I grow well in the rainy season. Children pluck me from the ground and admire me. I absorb nutrients from decomposed dead parts of plants and animals in the soil. _____________, _______________.

Answer 1

Answer:

Solution

(a) tree, Autotroph

(b) fish, heterotroph

(c) mosquito, parasite

(d) mushroom, saprophyte

Answer 2

Answer:

(b) Fish, Heterotroph

(c) Mosquito, Parasite

(d) Mushroom, Saprophyte

Explanation:

• Nutrition is the process through which an organism uptakes food needed for growth and development.

• Plants can produce food for themselves, but animals are unable to make their food. They obtain food from plants or animals that eat plants. Humans and animals thus depend on plants, directly or indirectly, for food.

• Organisms can be autotrophic or heterotrophic based on their mode of nutrition.

• 1. Autotrophs are the producers as they prepare food required by all other organisms.

• 2. Heterotrophs are the consumers as they consume food prepared by autotrophic organisms.

• In a food chain, autotrophs occupy the first trophic level while the heterotrophs form the next trophic levels after plants in the food chain.

• Heterotrophic nutrition is further divided into three types- saprotrophic nutrition, parasitic nutrition, and holozoic nutrition.

• (b) Fish dwells in water and are usually kept in an aquarium at home. It cannot make its food, therefore is known as a heterotroph.

• (c) Parasites are heterotrophs that are entirely dependent on other organisms for all forms of nutrition. They depend on a host for nutrition and form a parasitic relationship. e.g. Mosquito
• (d) Saprotrophs/ Saprophytes are the organisms that feed on the dead and decaying organic matter. e.g. Mushroom (Fungi)

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