Our environment Worksheet-1

Our environment Worksheet-1

Fill in blanks:

1. _______ is the sum total of all external conditions and influences that affect the life and development of an organism

2. _______ is colloidal solution of solids in air.

3. Chlorofluorocarbons cause depletion of _______ layer.

4. In stratosphere, ozone layer protects us from _______ radiations.

5. Some non-biodegradable chemicals like DDT enter our food chain and get accumulated in the bodies of organisms with increase in amount and effect at each step. This is called ______.

6. Animals which depend on plants as well as other animals are _______.

7. Group of micro-organisms that breaks the complex dead organic matter into simpler substances by a natural process is called _______.

8. _______ are very minute microscopic organisms freely floating on the surface of water in a pond, lake, river or ocean.

9. The aquatic plants which are photosynthetic microscopic, free floating and form producers in the aquatic ecosystem are called _______.

10. The aquatic animals which are microscopic, free floating and depend upon phytoplanktons for their food are ______.

11. Ozone is formed by the action of ______ on oxygen of the air in the upper atmosphere

12. ________ make their own food by the process of photosynthesis. _______ cannot make their own food

13. Food chain transforms ______ energy into ______ energy

Answer Key:

1. environment

2. aerosol

3. ozone

4. Ultra violet

5. Biomagnification

6. omnivores

7. decomposers

8. planktons

9. phytoplanktons

10. Zooplankton

11. sunlight

12. Autotrophs, Heterotrophs

13. Solar, chemical