(a) What an taxonomic aids ? (b) Give the importance of herbaria and museums . (c) How are Botanical Gardens and Zoological Parks useful in conserving biodiversity ?

a) Expalin how Mediterranean orchid adapted achieve pollination. b) Descirbe the importance of predators is an ecosystem . c) What is the Gauses 's 'competitive exclusion principle'?

(a) Explain how Mediterranean orchid adapted to achieve pollinatioin. (b) Describe the importance of predators in an ecosystem. ( c ) What is Gause's "competitive exclusion principle"?

What is plaster of paris? How is it parpared? Give its any two important uses.

Baking powder I used for baking. If your mother uses baking soda instead. (a) will It affect the taste of the cake ? How ? Why ? (b) How can baking soda be converted into baking powder ? (c ) What is the role of tartaric acid added to baking soda ?

(a) List two reasons for the appearance of variations among the progeny formed by sexual (b) reproduction. (i) Name the part marked 'A' in the diagram. (ii) How does 'A' reaches part 'B'? (iii) State the importance of the part 'C'. (iv) What happens to the part marked ‘D’ after fertilization is over?

(a) How is Buna-N prepared? Give equation (b) Name the monomers of Nylon-6, 6. (c) What are thermosetting polymers?

Distinguish between unisexual and bisexual flowers giving one example of each. Draw a neat diagram showing fertilisation in a flower and label: a] Pollen tube b] Male germ cell c] Female germ cell, on it. OR Draw the diagram showing the germination of pollen on stigma and label the part on which pollination takes place. Answer the following questions based on diagram given aside. i] Name the part marked 'P. in the diagram. ii] How does 'P. reach part 'B'? iii] State the importance of the part 'C'. iv] What happens to the part marked 'D' after fertilisation is over? Mention the role of gamete and zygote in sexually reproducing organisms.