1 Name the functional unit of the environment comprising of the living & non living components.
2 a) What % of energy available at the producer level is transferred at successive trophic levels in a food chain?
b) What % of the solar energy is trapped & utilised by the plants?
3 Explain one way in which BRYOPHYLLUM plants can be reproduce by the method of vegetative propagation.
4 How are the modes of reproduction different in unicellular & multicellular organisms?
5 a) For what purpose is the 'Khadin' technique used in Rajasthan?
b) Mention atleast two advantages of this technique.
6 Why should the fossil fuels be used judiciously?
7 a) What is meant by pollination? How does pollination occur?
b) State the advantage of sexual reproduction over asexual reproduction.
8 Explain various factors which could lead to the formation of new species.
9 a) What are fossils?
b) Explain various ways of estimating the age of fossils.
10 a) Name any four varieties of of vegetables which have been produced from 'wild cabbage' by the process of artificial selection.
b) Give one example of an evolutionary change produced in an organism for one purpose which later on becomes more useful for a different function.
11 a) How does the embryo get nourishment inside the mother's body?
b) What happens when the egg is not fertilised?
c) Draw a neat & well labelled diagram of human - female reproductive system.
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