Our environment Worksheet

Our environment Worksheet-10

1. What is the physical environment of an ecosystem called?

2. What is the functional unit of the environment, comprising the living and non-living components called?

3. Which part of solar radiation is absorbed by ozone layer?

4. Give an example of man-made ecosystem.

5. Which organism can make organic compounds from inorganic substances using radiant energy of the sun?

6. What is the advantage of a disposable paper cup over a plastic cup?

Our environment Worksheet-11

1. Describe any four modes of disposal of waste.

2. How are depletion of ozone layer caused and what is its effect on our environment?

3. What are decomposers? Write the role of decomposers in the environment.

4. What is biological magnification? if the concentration of DDT were 0.2 ppm in water of a lake, what would be its likely concentration in fish in the following food chain? Plankton → Fish → Fish-eating birds.

5. Write the food chain operation in a fresh water pond. Mention the food habit of each trophic level in this food chain.

Our environment Worksheet-12

21. Consider the food chain. Grass → Deer → Lion. What will happen, if lions are removed from the above food chain?

22. Give two main differences between a food web and food chain.

23. The number of trophic levels in a food chain is limited. Why?

24. "All the flesh of a carnivore is grass". Justify the statement.

25. How much energy will be available to hawks in the food chain comprising hawk, snake, paddy and mice if 10,000 J of energy available to paddy from Sun?

26. 'Man is only a consumer.' Justify the statement.