1. Name the part of the human eye that helps in changing the focal length of the eye lens.
2. Write the next higher homologue of the following : (i) C3H6O (ii) C5 H8
3. Select the biodegradable wastes from the following : DDT, Crop’s residue, Leather and Glass
4. In a food chain consisting of snake, insect, grass and frog, assign an appropriate trophic level to frog.
5. What is the cause of dispersion of white light passing through a prism ? Which colour of light deviates the -
(i) most ; (ii) least
6. Why does the clear sky appear blue ? How would the sky appear in the absence of earth’s atmosphere ?
7. How can you identify the three types of mirrors without touching ?
8. An element has electronic configuration 2, 8, 3. What is the atomic number of this element ? To which
(i) group and (ii) period this element belong ?
9. How does atomic size vary in a group from top to bottom and in a period from left to right ? Explain.
10. Name those parts of a flower which serve the same function as the following do in the animal :-
(i) Testis (ii) Ovary (iii) Eggs (iv) Sperms
11. What are fossil fuels ? How are they formed ?
12. What is ozone ? How does it protect the organisms on the Earth ?
13. What are sexually transmitted diseases ? Name an STD which damages the immune system of human body ?
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