Question

Which of the following steps can be followed for making the apparatus air tight?
i. placing the plants on glass plate
ii. using a suction pump.
iii. applying aseline to seal the bottom of jar. iv. creating vacuum
A. i and ii
B. ii. and iii
C. i. and iii
D. ii. and iv​

Answer 1

Answer:

c option is correct

Explanation:

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Answer 2

1.Placing the plants on a glass plate will make sure there is no gap between the jar and the bottom. Hence, it can be used to create an air-tight condition.

2.By using a suction pump, all the air inside will be removed. So, this step draws the air. Hence, it cannot be used to create air-tight conditions.

3. Using vaseline, the moisture will be sealed. Hence, it can be used to create air-tight conditions.

4. By creating a vacuum, only removes the air already present inside the jar. So, it doesn't make the apparatus air-tight.

Thus, the correct option is 1 and 3.

Hence, C is the answer.