Our environment Worksheet

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 ______.

Our environment Worksheet-2

1. Which of the following are biodegradable waste?

A. DDT                                            B. polythene bags

C. Cloth                                           D. Paper

E. Wool                                           F. glass

Our environment Worksheet-3

1. The ultimate source of energy in an ecosystem is

A. Glucose                                      B. Green plants

C. Sunlight                                     D. Protein

2. In a forest ecosystem green plants are

A. Primary producers                  B. Primary consumers