Page 221 - NCERT Science Class 10 English Medium

Activity
Activity 13.913.9
Activity
Activity 13.9
13.9
Activity 13.9
n Search the internet or library to find out what hazardous materials
have to be dealt with while disposing of electronic items. How would
these materials affect the environment?
n Find out how plastics are recycled. Does the recycling process
have any impact on the environment?

Q U E S T I O N S

1. What is ozone and how does it affect any ecosystem?
2. How can you help in reducing the problem of waste disposal? Give ?
any two methods.

What you have learnt

n The various components of an ecosystem are interdependent.
n The producers make the energy from sunlight available to the rest of the ecosystem.
n There is a loss of energy as we go from one trophic level to the next, this limits the
number of trophic levels in a food-chain.

n Human activities have an impact on the environment.
n The use of chemicals like CFCs has endangered the ozone layer. Since the ozone
layer protects against the ultraviolet radiation from the Sun, this could damage
the environment.
n The waste we generate may be biodegradable or non-biodegradable.
n The disposal of the waste we generate is causing serious environmental problems.

E X E R C I S E S

1. Which of the following groups contain only biodegradable items?
(a) Grass, flowers and leather
(b) Grass, wood and plastic
(c) Fruit-peels, cake and lime-juice
(d) Cake, wood and grass
2. Which of the following constitute a food-chain?
(a) Grass, wheat and mango

(b) Grass, goat and human

216 Science

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