Saturday, November 5, 2011

10th Science - Our Environment/Management of Natur...

CBSE PHYSICS: 10th Science - Our Environment/Management of Natur...:
Set-1Chapter - 15 Our Environment
1 mark questions :-
1. Write any one significance of biochemical cycles?
2. Define environment.
3. According to the sustenance from environment, organisms can be grouped into which three categories?
4. Name any two groups of producers.
5. Define consumers.
6. Write the two raw materials for making food, used by living organisms of first trophic
7. Explicate the principle of food web.
8. Which of the following are more numerous in a food chain :–(i) Secondary consumer (ii) Tertiary consumer
9. Define biological magnification.
10. Write the names of two decomposers.
11. Define global warming.
12. Write one ill effect of exposure to ultraviolet rays.
13. Which component of sunlight is vital for formation of ozone?
14. As a step to control pollution ‘Kulhads’ were used on a large scale. What was the ill
effect of this practice?
15. A food chain consists of grass, lion and rabbit. In this food chain, which organism will
transfer maximum energy?
16. Which of the following are Biodegradable; plastic toys, cow dung, aluminium foil and
17. Name the programme that froze CFC production in 1986.
18. Expand UNEP.
19. Which is greater – energy lost to the environment or energy transferred to next trophic
20. Write a common feature between a food chain and energy flow in nature.
21. How is packaging related to increase in non biodegradable waste?
22. Burning the coal yields energy, but if try to eat coal we will not get any energy. Why?
2 marks questions :-
23. Distinguish between biodegradable and non biodegradable wastes. Cite examples.
24. Why is a plastic bag is called non-biodegradable while a paper is not?
25. Choose a biotic components comprising physical factors from the following : Rose, Soil,
Leaf, Potato, Mountain, and Atmospheric pressure.
26. Name any four ecosystem.
27. Differentiate between natural and artificial ecosystem.
28. Why decomposers are necessary in environment?
29. Distinguish between food chain and food web.
30. Draw a pyramid showing four trophic levels.
31. Consider a food chain:-
Grass -------> Insect------->Frog ------->Snake ------->Hawk 900KJ
How much energy is available at the first trophic level and fifth trophic level respectively.
32. Enlist two uses of CFCS. Write their harmful effect.
33. What will happen if all the snakes are eliminated from the following
Grass ------->Insect -------> Frog ------->Snake ------->Hawk
34. Is the road near your school a part of ecosystem? Explain
35. A neem tree is a producer but not the bread mould found on bread we eat. Give reasons.
36. Describe the process of decomposition.
37. Pesticides are useful to farmers, yet considered as pollutants. Give reason.
38. Energy stored in the body of lion is the energy coming from sun. Justify.
41. Enlist various categories of consumers giving examples of each.
42. Describe the 10% law of flow of energy using example. What percentage of solar energy
is captured by plants in terrestrial ecosystem that falls on their leaves?
43. Write two informations obtained from the energy flow diagram.
44.H A farmer cultivates wheat crop in his agricultural field. Explain the interlinks of Biotic andabiotic factors in this case.45.H Explain how the pesticide used in the field reaches inside the body of a tertiary consumer?
46. Recently the honourable court of justice banned the use of polythene bags. Do you
support the step. Explicate with reasons.
47. Correlate the natural replinishment of soil and decomposers.
5 marks questions :-
48. Make two food chains and a food web from the following set of living organisms : Grass, Lion, Vulture, Deer, Insect, Snake. Identify the tertiary consumer in both of the food chains.
49.H Identify a deadly poisonous gas ‘X’ found at higher level of atmosphere which shields the surface of earth from harmful radiations from the sun. Write its chemical formula and equation of its formation. Why is damage to the ‘X’ layer a cause of concern? What steps are beings taken to limit this damage?
50.You are involved in a discussion on Interrelationship between environment and life styles.” with Nagendra and Paramjit. Nagendra is a village farmer and Paramjit is a
owner of a popular showroom. Give the details of issue discussed. Describe the illeffects of such lifestyles on the environment.
Solution and hint
1. Recycling of different materials.
3. Producers, consumers, decomposers
4. Green plants, certain blue green algae
6. CO2 and H2O
7. Each organism generally eaten by two or more organisms.
8. Secondary
9. Accumulation of materials
10. (i) Bacteria (ii) Fungi
12. Skin cancer
15. Grass to rabbit
17. UNEP
22. we lack enzymes to obtain coal’s energy
31. I = 9000 KJ, V = 0.9 KJ
32. Extinguisher or refregerant cause ozone layer depletion
35. Neem in autotroph, Bread mold parasite
39. Deer, grass hopper, scorpion40. owl, lion, vulture, fox
Set-2 10th Science - Our Environment/Management of Natural Resources

1. What is pollution?

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