Paheli dug two pits, A and B, in her garden. In pit A, she put a polythene bag packed with some agricultural waste. In pit B, she dumped the same kind of a waste but without packing it in a polythene bag. She then covered both the pits with soil. What did she observe after a month?

Waste in pit A degraded faster than that in pit B.

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Waste in pit B degraded faster than that in pit A.

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Waste in both pits degraded almost equally.

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Waste in both pits did not degrade at all.

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Solution

The correct option is B
Waste in pit B degraded faster than that in pit A.

The correct option is B.
The explanation for the correct option:
As pit B was kept open it took oxygen faster than pit A.
The rate of decomposition of organic waste by microbes depends directly on the amount of oxygen supplied.
Whereas pit A was covered with a polythene bag due to which the oxygen supplied got blocked resulting in no decomposition.
The explanation for the incorrect options:
Option A
Pit A was covered with a polythene bag so it could not take oxygen.
Due to the absence of oxygen decomposition in the pit, A cannot be faster than in pit B.
Option C
Pit B was open and pit A was covered. with a polythene hag
As the rate of oxygen intake was different in both pits the rate of decomposition cannot be the same.
Option D
Pit B was open so it got a free supply of oxygen and the agricultural waste went through microbial decomposition.
Whereas pit A was covered so microbial decomposition didn't take place.
Final answer: Waste in pit B degraded faster than that in pit A.

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Similar questions

Q. Read the passage given below and answer the questions that follow:
Medha is very concerned about her environment. She tries to minimise the waste that she generates. She keeps one bin for waste paper and a separate bin for tin cans, aluminium foil, plastic and glass bottles. In her garden, she has a pit where she throws the kitchen waste. She keeps the old newspapers carefully and sells them to the trader every month. She keeps the old newspapers carefully and sells them to the trader every month. She makes pencil stands out of old cardboard cartons, and a bird feeder with an old plastic bottle. She prefers to buy drinks that are sold in glass bottles rather than in tetrapacks. Medha has been using the same fountain pen for the last two years, unlike her friends who have thrown away numerous refills used up in their ball pens.
(a) Why does Medha keep two separate waste bins?
(b) Why does Medha throw the kitchen waste in a garden pit?
(c) What are the three R's of managing waste? Give examples from the passage to show how Medha follows them.

Q. Take two pots and fill each pot half with soil. Mark them A and B. Put plant waste in pot A and things like polythene bags, empty glass bottles and broken plastic toys in pot B. Put the pots aside. Observe them after

3 - 4

weeks.

Question 11

Paheli was writing a letter to her friend. She crumpled and threw the first draft of her letter on the floor as it had become untidy. Similarly, she crumpled and threw 6 more papers on the ground. In the end, she picked them up and put them in a polythene bag and threw it on the road outside her house.

Do you think, Paheli's action was responsible? What would you have done if you were in her place?

Question 2

If you dump kitchen waste in a pit, it may, after sometime

(a) convert into compost

(b) convert into vermicompost

(d) remain forever in its dried form

Q. Sheryl dug two pits, A and B, in her garden. In pit A, she put a polythene bag packed with some agricultural waste. In pit B, she dumped the same kind of waste but without packing it in a polythene bag. She, then covered both the pits with soil. What did she observe after a month?

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