CBSE Class 9 Answered
Two similar plastic trays filled with soil and manure are taken. In tray A mustard seeds are sown and watered for 4-5 days until they germinate into seedlings and the seedlings grow into small plants. Watering of the tray A is stopped for the next 2-3 days and the small plants are allowed to grow. Trays A and B are placed over a brick in a tilted position. Now both the trays are watered with equal amount of water using a water can.
Now answer the questions given below :
(a) Name the natural phenomenon indicated in Tray B.
(b) Less water flows out in Tray A. Give reason.
(c) Why is the top layer of the soil considered the most important layer?
Now answer the questions given below :
(a) Name the natural phenomenon indicated in Tray B.
(b) Less water flows out in Tray A. Give reason.
(c) Why is the top layer of the soil considered the most important layer?
Asked by Topperlearning User | 27 Apr, 2016, 08:03: AM
Expert Answer
(a) Soil Erosion
(b) Tray A has plants growing in it. Roots of the plants play important role in binding the soil particles.
(c) Because it is rich in humus and living micro organisms that helps in recycling of nutrients in the soil.
Answered by | 27 Apr, 2016, 10:03: AM
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