Sahara Desert was formed over a period of time due to one of the following uncontrolled activities of man:

One of the following helps in the recycling of materials in an ecosystem. This one is:

In the food chain comprising of a snake, grass, insect, and frog, the secondary consumer is:

The sea water contains water beetles, tadpole, fish and weeds.

(a) Write a food chain comprising all the given organisms.

(b) Which organisms in the food chain is

(i) Herbivore

(ii) Carnivore

(c) Which organisms are

(i) Predators

(ii) Prey

(d) Which organisms can trap solar energy to make food?

(e) Which organism is a secondary consumer?

The following is a food chain that ends with human:

Plants → bee → human

(a) Explain how plants provide food for bees.

(b) How do bees provide food for humans?

(c) How does this food chain differ from a usual food chain involving human such as: plants goat human?

(d) Do you think that the food chain given in this question can really be regarded as a food chain? Explain your answer.