Q9 of 17 Page 139

Why do farmers plough their field during summer?

Farmers generally plough their field during summer because the fields are dry and hard and it is easy to break and tilt the soil and soil can be well aerated. But in the rainy season due to waterlogging ploughing cannot be done properly and soil cannot be well aerated for good supply of air which is required for growth of crops.


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7

Rahim removed weeds in his crop field, but David did not. Guess who get more yield. Why?

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What is natural manure? How to prepare it? Give two examples?

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Rajendra cultivated cotton crop in his field. He did not get sufficient yield. Can you guess the reasons?

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What do you observe in the experiment of dropping a fist of Bengal gram seeds in water?

- What are the differences you observed in both the seeds?


- Do you know why the floated seeds are lighter in weight?


- Which seeds germinate well? Why?


- Which seeds would not germinate properly? why?