Question

C. Choose the correct alternative:

1. The
crop which increases nitrogen fertility of the soil is :
(a) wheat
(b) tomato
(c) beans
(d) maize
2. The process of removing the grains from seed coat is called :
(a) threshing
(b) winnowing (c) ploughing
(d)harvesting
3. The implement used to uproot weeds is :
(a) harrow
(b) tractor
(c) sickle
(d)drill
4. Transplanting is not done in :
(a) brinjal
(b) rice
(c) wheat
(d)onion
5. Which one is a weedicide ?
(a) 2, 4, D
(b) DDT
(c) Bhc
(d) Malathion
​

Answer 1

Answer:

1.Beans

2.Winnowing

3.Sickle

4.onion

5.2,4-d

Answer 2

Answer:

1. (c) beans

2. (b) winnowing

3. (a) harrow

4. (d)onion

5. (a) 2, 4, D                                      

Explanation:

• 1. The crop which increases nitrogen fertility of the soil is beans.

• Beans belong to the Fabaceae or Leguminosae, which are rich in nitrogen content. These legume plants and seed tissues possess high protein levels in them.
• Legume plants can supply most of their own nitrogen needs with the help of symbiotic bacteria. And are thus beneficial in increasing nitrogen fertility of the soil.

• 2. The process of removing the grains from the seed coat is called winnowing.

• (b) Winnowing is the process of separating heavier and lighter components of a mixture by wind or blowing air.

• Farmers use this method to separate lighter husk particles from heavier seeds of grain.

• 3. The implement used to uproot weed is a harrow.

• (a) Harrow refers to a farm implement used to pulverize the soil, break up crop residues, uproot weeds, and cover seeds. Modern harrows comprise several varieties.

4. Transplanting is not done in onion.

• Transplanting is a process, wherein a seedling is uprooted from a nursery bed and transplanted to a permanent place, where it grows to produce yield.
• Solanaceous vegetable crops can endure transplanting shock and can form secondary roots.  

• Hence, these can successfully be transplanted. Tomato, brinjal and chilli are ready for transplantation in 4–5 weeks after sowing.

• Rice transplantation is the most common elaborative agricultural method of crop establishment.

• Thus, transplanting is not done in onions.

5. 2, 4, D is a weedicide.

• 2, 4-D (Dichloro phenoxy acetic acid), is a chemical that kills weeds and is known as weedicide. It is used to destroy broadleaf weeds.

• 2,4-Dichlorophenoxyacetic acid is a widespread systemic herbicide utilized in the management of weeds with broad leaves.

#SPJ2