Question

a very important exam please answer these questions guys please a humble request​

Answer 1

Answer:

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Explanation:

SECTION B-

Q5) In first setup we see that the flame is burning because of presence of air inside the glass

in second and third set up we found that the flame is not burning because of absence of oxygen inside the glass this shows that oxygen is necessary for burning of flame

Q6) farmer is spraying pesticides on undesirable plants. he covers his mouth because they are very harmful that if it gone inside our body it can harm our body. the right time to spray pesticides on plant is when the weeds are grown.

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