3. Complete Activity 12.3 (Page 147). Dig a small pit. Put vegetable waste and leaves in it. Cover them with soil. Add some water. After three days, remove the upper layer of the soil. Does the pit feel warm inside?
Answer:
The activity can be carried out as shown below:
Aim: To prepare the pit with vegetable waste and examine why it feels warm after sometime.
Materials Required: Vegetable waste, leaves, soil, water, spade.
Procedure:
(i) Dig a small pit in your garden with a spade.
(ii) Put the vegetable waste and leaves in it.
(iii) Cover the pit with soil and add some water.
(iv) After three days, remove the upper layer of the soil and examine the pit.
Observations: You will observe that the pit feels warm.
Conclusions: The pit feels warm because of heat generated during the decomposition process of the organic matter by micro-organisms.
“Dig a small pit. Put vegetable waste and leaves in it. Cover them with soil. Add some water. After three days, remove the upper layer of the soil. Does the pit feel warm inside?” – Solved.
Related Links:
Solution to Extended Learning Problem 1
Solution to Extended Learning Problem 2
Solution to Activity 12.1
Solution to Activity 12.2
Solution to Activity 12.3
