Question
Distinguish between :
Food chain and Food web
Food chain and Food web
| S.No. | Food Chain | Food Web |
| 1. | Food web is a sequence in which energy is transferred in the form of food from one organism to another in a community. | 1. Many food chains are interconnected with each other forming a food web. In this organisms have many alternative ways to get food. |
| 2. | The number of organisms is limited in food chain. | 2. The number of organisms is relatively more or unlimited. |
| 3. | The organism of one trophic level connects with the organism of another trophic level. | 3. An organism can be used as food by organisms of more than one food chain. Example :![]() |
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OR
In snapdragon (Antirrhinum majus), a plant with red flowers was crossed with a plant with white flowers. Work out all the possible genotypes and phenotypes of F1 and F2 generations. Comment on the pattern of inheritance in this case.OR
Anthropogenic action can hasten evolution. Explain with the help of a suitable example.| S.No. | A | S.No. | B |
| (a) | Coitus interruptus | (e) | Vasectomy |
| (b) | Spermicidal Jelly/ cream | (f) | Natural family planning |
| (c) | Condom + spermicide | (g) | Diaphragm + spermicide |
| (d) | Natural family planning | (h) | IUD |