CHAPTER-10 OUR ENVIRONMENT: CBSE SOLVED GUESS PAPER
1 Marks Questions: [5]
1. Which of the following organism is likely to have maximum concentration of DDT :
Algae, fish, water flea, frog, bird
2. What is the role of bacteria and fungi in an ecosystem?
3. What are trophic levels?
4. How much energy is transferred to the next trophic level in a food chain?
5. Which trophic level has the highest concentration of toxic substances in a food chain?
Two marks questions [10]
6. Mention some sources of CFC�s.
7. Distinguish between a food chain & a food web
8. What would happen if there are no decomposers on earth?
9. What is a food chain? Write a five step food chain found in grass land with frog as one of the members.
What will happen to organisms at different trophic levels if all the frogs are removed?
10. The number of malaria patients increased tremendously when a large number of frogs were exported
from the village .What could be the cause for it? Explain with the help of a food chain.
Three marks questions [15]
11. What are the problems caused by the non-biodegradable wastes that we generate?
12. Food chains generally consist of only 3 or 4 trophic levels. Why is it so?
13. Observe the food chain Plant (1000 kJ) --- >Goat ---> Lion
(a) If autographs occupying the first trophic level are called producers what are herbivores Called as?
(b) How much energy does the lion get in the above food chain?
14. Vegetarian or non vegetarian food habit help us in getting more energy. Why?
15. How is ozone formed in the upper atmosphere? Why is the damage of ozone layer a cause
of concern to us? State cause of this damage.
1 Marks Questions: [5]
1. Which of the following organism is likely to have maximum concentration of DDT :
Algae, fish, water flea, frog, bird
2. What is the role of bacteria and fungi in an ecosystem?
3. What are trophic levels?
4. How much energy is transferred to the next trophic level in a food chain?
5. Which trophic level has the highest concentration of toxic substances in a food chain?
Two marks questions [10]
6. Mention some sources of CFC�s.
7. Distinguish between a food chain & a food web
8. What would happen if there are no decomposers on earth?
9. What is a food chain? Write a five step food chain found in grass land with frog as one of the members.
What will happen to organisms at different trophic levels if all the frogs are removed?
10. The number of malaria patients increased tremendously when a large number of frogs were exported
from the village .What could be the cause for it? Explain with the help of a food chain.
Three marks questions [15]
11. What are the problems caused by the non-biodegradable wastes that we generate?
12. Food chains generally consist of only 3 or 4 trophic levels. Why is it so?
13. Observe the food chain Plant (1000 kJ) --- >Goat ---> Lion
(a) If autographs occupying the first trophic level are called producers what are herbivores Called as?
(b) How much energy does the lion get in the above food chain?
14. Vegetarian or non vegetarian food habit help us in getting more energy. Why?
15. How is ozone formed in the upper atmosphere? Why is the damage of ozone layer a cause
of concern to us? State cause of this damage.
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