Which of the following statements is not true for organic manure?

1

(a)

It enhances water holding capacity of soil

(b)

It has a balance of all plant nutrients

(c)

It provides humus to soil

(d)

It improves texture of soil

Planting of seeds is called

1

(a)

cultivation

(b)

irrigation

(c)

harvesting

(d)

sowing

Which one of the following conditions is not essential to grow maize?

1

(a)

High temperature

(b)

Humidity

(c)

Low temperature

(d)

Rainfall

...................is a device to spread seeds in soil

1

(a)

seed drill

A most common weedicide is..........

1

(a)

2,4-D

Growing different crops in different seasons in the same field will deplete the soil of nutrients.

1

(a) True

(b) False

All crop plants are sown as seeds in the field.

1

(a) True

(b) False

Cells of root nodules of leguminous plants fix nitrogen.

1

(a) True

(b) False

Name the applied branch of biology that deals with plants as well as animals.

2

(a)

Paddy cannot be grown in winter season. If yes, why?

2

(a)

Fishes are considered good for health. Give reason.

2

(a)

Despite favourable climatic conditions, a farmer's crop failed to give good yield. Give the possible reasons for this.

3

(a)

Explain how fertilisers are different from manures.

3

(a)

You must have heard farmers talking about soil fertility. What is it? Mention some methods by which soil fertility can be replenished.

5

(a)

Explain various agricultural practices in sequential manner.

5

(a)