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Theory

Exercises

1. Constituents of air

Difficulty: easy

2
2. Uses of air

Difficulty: easy

2
3. Inhalation and exhalation

Difficulty: easy

3
4. Equation of photosynthesis and respiration

Difficulty: easy

2
5. Air composition

Difficulty: medium

4
6. Dust particles

Difficulty: medium

4
7. Gases in the air

Difficulty: easy

2
8. Gases used by plants and animals

Difficulty: medium

4
9. Other constituents of air

Difficulty: medium

4
10. Respiratory organs

Difficulty: medium

4
11. Respiration

Difficulty: hard

6
12. Contents of air

Difficulty: hard

6

Tests

1. Training test 1

Difficulty: medium

8
2. Training test 2

Difficulty: medium

9

Teacher manual