Page 97 - ACTIVE SCIENCE 4 TOC

LET’S
REVISE

• Plants and trees make our surroundings clean and fresh.

• Trees provide us raw material like wood to make paper, timber to make furniture
and firewood for fuel, etc.

• They provide medicines.
• We are cutting excessive trees to meet our needs.

Glossary
• Deforestation : To cut trees in huge numbers.

• Afforestation : Plant more trees on barren land.

Practice Time

A. Tick the correct option.

1. The destruction of forests leads to shortage of _____________.
a. plants b. food

c. animals d. birds
2. Which of the following is made of wood?

a. Table b. Freezer

c. Television d. Oven
3. Trees give us _____________.

a. oxygen b. nitrogen
c. carbon dioxide d. none of these

4. Cutting many trees is called _____________.
a. deforestation b. afforestation

c. plantation d. none of these

B. Fill in the blanks.

1. Trees provide us clean air to _____________.

2. We get _____________ for industries from trees.
3. We should plant more trees to reduce the harmful effects of _____________.

4. Organise events like _____________ to plant trees.

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