1.

Fill in the blanks: 1. _____ is the active component of air. 2. The gas given out during photosynthesis is _____ 3. _____ gas is given to the patients having breathing problems. 4. _____ can be seen moving in a beam of sunlight in a dark room. 5. _____ gas turns lime water milky.

Answer»

1. Oxygen 

2. Oxygen 

3. Oxygen 

4. Dust particles 

5. Carbon-di-oxide



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