1. List two man made ecosystems. [1]2. If a lake is contaminated with pesticides, which one of the following organisms will contain in its body the maximum concentration of pesticides and why? Small fish, Pelicans, Zooplanktons, Phytoplankton, Big fish.[1]
3. What are fossil fuels? The excessive use of fossil fuels is discouraged. Why?[2]
4. List four changes you would like to incorporate in your life style which would facilitate the more towards a sustainable use of available resources in our country.[2]
5. In tobacco plant, the male gametes have 24 chromosomes. State the number of chromosomes in (i) egg nucleus, (ii) zygote, (iii) endosperm and (iv) leaf cell.[2]
6. The organisms formed by asexual reproduction are considered as clones. Why? State the advantage of sexual reproduction over asexual reproduction. [2]
7. List three methods to limit the family size. State the principle involved in each.[3]
8.What is speciation ? Describe in brief the factors that control the process of speciation.[3]
9.What are homologous organs ? Illustrate with suitable examples, how is the process of evolution related to homologous organs.[3]
10. Differentiate between inherited traits and acquired traits. The traits acquired during lifetime of an individual are not inherited. State reason. [3]
11. (a)Name the parts labeled - A, B, C and D in the above diagram. [5]
(b) Name the parts associated with
(i) Fertilization (ii) Production of an egg
(c)What happens to the lining of the uterus –
(i) Before release of fertilized egg ? (ii) if no fertilization occurs ?
12. (a) Draw a diagram to show fertilization in a flowering plant and label on it –[5]
(i) Stigma (ii) Ovary (iii) Pollen grain (iv) Female germ cell
(b) Define the term ‘Double Fertilization’ in plants. After fertilization name the part that develops into - (i) Fruit (ii) Seed
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