Soil & Crops

Q.

Why do farmers spread fertilizers and manures in the fields?

Q.

Name the three plant nutrients commonly present in fertilizers and manures

Q.

Manure helps in

1. Improving texture of soil.

2. Increasing air gaps in soil.

3. Enriching soil with nutrients.

4. Higher retention of water in soil

Q.

What is pedon? Describe the different layers of soil or soil profile.

Q.

Blast is a ____ disease of paddy.

Q.

Long answer questions.

List the types of soil found in India and write their characteristics.

Q.

Raman took 3 pots namely a, b and c. In all of them , he added soil, a gram seed each aand equal amount of water. In A:, he added chemical fertilizer. In B, he added manure . He didn't add anything in pot C.

A) which pot shows maximum growth of plant?

B) which pot shows minimum growth?

C)which pot shows better growth of plant?

D) give reasons for difference of growth in plants.

Q.

Explain the features of sandy and loamy soil.

Q.

This layer of soil has a lesser amount of humus, it is harder and more compact. Which layer of soil are we referring to?

1. Top soil

2. A-horizon

3. B- horizon

4. C-horizon

Q.

Which of the following soil is best for growing plants:

1. Sandy

2. Loamy

3. Clayey

4. All of these

Q. What properties of soil are best for farming?

Q.

Differentiate clayey, loamy and sandy soil.

Q. Water percolating into the soil collects over

(a) A-horizon
(b) B-horizon
(c) C-horizon
(d) none of these

Q. Which of the following are the substances that are present in the soil and required for the growth of crops?

1. Manures
2. Pesticides
3. Fertilisers
4. Nutrients

Q. Why is the highest peak in plot A graph slightly delayed?

Q. Clay soil is obtained

1. In desert
2. Around ponds
3. On seashore
4. On rocks

Q. Name the different layers of soil.

Q. Since clay holds more water, it is very good for plants as they get plenty of water. True of false?

Q. Which soil will absorb more water-sandy soil or clayey soil? Why?