General Instructions
1. All questions are compulsory.
2. There is no overall choice However, internal choice has been provided in all the
Question of five marks category. Only one option in such questions is to be attempted.
3. Questions 1 to3 in section B are very short answer type questions and carry one mark each.
4. Questions 4 to 7 in section B are short answer type questions
and carry two marks each.
5. Questions 8 &9 are also short answer type
Questions and carry three marks each.
6. Question 10 is long answer type
Question and carry five marks each.
1. Name one gaseous and one liquid excretory product of plants.1
2. Name the type of respiration for the given end products-
a )water and carbon di oxide b) ethyl alcohol. 1
3. Mention two ways by which humans tried to conserve the wild life in our country.1
4. Write the main function of the following parts of the nervous system-
a) Forebrain
b) Cerebellum
c) Mid brain
d) Spinal cord. 2
5. Give reason why-
a) It is not possible to have more than six steps in a food chain.
b) The flow of energy is unidirectional in ecosystem. 2
6. (i) Arrange the following according to their evolutionary closeness. (You may use
Your knowledge of classification also).
(ii) Whose DNA among the following do you think is most similar to that of humans?
Honey bee, bird, gorilla, and fish 2
7. Adrenalin is released in blood when you suddenly see a dog approaching towards you at a great speed. Name the two vital body systems which are affected by this hormone. What effects are produced in these systems by this hormone? 2
8. What are the two types of water harvesting? How is rain water harvested? Why is rain water harvesting important in the present scenario? (Mention any two points) 3
9. The genotype of wrinkled seeds is denoted as rr and that of round seeds as RR. When these two are crossed,
(i) What shape of seeds and in what ratio would you expect in their F2 progeny?
(ii) Write the genotypes of the plants obtained if F1 plants are self pollinated.
(iii)Why do the round seeds occur in greater ratio in the F2 generation? 3
10.(a) Draw a well-labeled diagram of the longitudinal section of the ovary showing the process of germination of pollen grain.(b)Define pollination. (c) What happens to the style , stigma , petals , sepals and stamen after the fertilization occurs in the flower?
OR
What are the essential components required for the process of photosynthesis? Write the steps involved in the process of photosynthesis.5
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