1.13 Exercises
NCERT Class 8 Science Textbook for Blind Students made Screen Readable by Dr T K Bansal.
Q1. Select the correct word from the following list and fill in the blanks.
float, water, crop, nutrients, preparation
(a) The same kind of plants grown and cultivated on a large scale at a place is called _____________.
(b) The first step before growing crops is _____________ of the soil.
(c) Damaged seeds would _____________ on top of water.
(d) For growing a crop, sufficient sunlight and _____________ and _____________ from the soil are essential.
Q2. Match items in column A with those in column B.
| Column A | Column B |
|---|---|
| (i) Kharif crops | (a) Food for cattle |
| (ii) Rabi crops | (b) Urea and super phosphate |
| (iii) Chemical fertilisers | (c) Animal excreta, cow dung urine and plant waste |
| (iv) Organic manure | (d) Wheat, gram, pea |
| (e) Paddy and maize |
Q3. Give two examples of each of the following.
(a) Kharif crop
(b) Rabi crop
Q4. Write a paragraph in your own words on each of the following.
(a) Preparation of soil
(b) Sowing
(c) Weeding
(d) Threshing
Q5. Explain how fertilisers are different from manure.
Q6. What is irrigation? Describe two methods of irrigation which conserve water.
Q7. If wheat is sown in the kharif season, what would happen? Discuss.
Q8. Explain how soil gets affected by the continuous plantation of crops in a field.
Q9. What are weeds? How can we control them?
Q10. Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.