Question

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Answer 1

Answer:

1⇒ Yes, things burn of Oxygen [O2], coz it is an oxidiser... thus adds as fuel to flame and help in combustion

2⇒ Animals require O2 for respiration [including humans], and the CO2 present on atmosphere is taken up by plants and give out O2 for our respiration

3⇒ When cold water kept out on room temperature... tries to cool down itself, thus when the vapour around comes in contact with room temperature... they form droplets

4⇒ Yes, more plants take CO2 inside and giveout O2 during the day... thus it reduces CO2

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Answer 2

Heyy

Here's your answer:

1. There's a need of three things for combustion to take place: fuel, ignition temperature, and OXYGEN. As air contains only 21% of oxygen, things will burn more readily in pure oxygen than in air.
2. Animals depend on plants for respiration because they need oxygen for respiration which can be made only by green plants by the process of photosynthesis.
3. This is because of the water vapours in the air. As soon as the vapours touch the cold outer surface of the vessel, they condense into water droplets.
4. I agree with the statement that planting more trees can reduce Carbon dioxide in air because plants need carbon dioxide for the process of photosynthesis in which they make their food. In this process, they take in carbon dioxide and give out oxygen.

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