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 - 

Q 52 - Case - potted plants were kept in the dark - Teachoo.jpg

Let’s check each option

  • For (i) - If we place plants on glass plate, it will make sure that there is no gap between the jar and the bottom. So, we can use this step.

  • For (ii) - If we use a suction pump, it will remove all the air inside the jar. So, this step does not make the apparatus air tight, it just removes the air

  • For (iii) - Vaseline will seal moisture and help the jar set at the bottom. So, we can use this step.

  • For (iv) - If we create vaccum, it will remove all the air inside the jar. So, this step does not make the apparatus air tight, it just removes the air


Thus, (i) and (iii) are correct

 

So, the correct answer is (c) 

 

 

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About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo