class vii science

1.what is nutrition?
ans:-Nutrition is the mode of taking food by an organism and its utilisation by the body.
2.what is nutrient?

ans:-The components of food are necessary for our body and are called nutrient.

3. define "Autotrophs"

ans:-Organism which produces own food from simple substances are called autotrophs.

Example-all green plant

4.define "heterotrophs"

Ans:-Organism which are unable to prepare their own food and have to depends upon others for food are called heterotrophs.

5.what is auto tropic  nutrition?

ans:-The mode of nutrition in which organisms make food themselves from simple substances is called autotrophic (auto = self; trophos = nourishment) nutrition.

6.what is heterotropic nutrition?

ans:-The mode of nutrition in which organisms does not make food themselves and takes ready made food from plant is called heterotropic nutrition.

7.what is photosynthesis?

ans:-photo synthesis is the process in which green plant prepares food from carbondioxide and water in the presence of sunlight aqnd green pigments.

8.whtat is parasitic?

ans:-parasitic is the organism that live on other organism and makes harm of that organism.

9. what is parasite?

ans:-parasite is the organism which depends upon other organism for food and shelter and makes harm to it.

10.what is host?

Ans-host is the organism on which parasite lives.