Question

Select the correct alternatives.

__________ and ________ are the plants which are grown to produce green manure.

• A. Sun hemp and Gaur
• B. Wheat and soya bean
• C. Xanthium and Parthenium
• D. Cyperus and Rotundus

Answer 1

The correct option is A

Sun hemp and Gaur

The correct option is A:

Explanation of the correct option :

Sunhemp:

1. It is a leguminous crop that is very fast-growing and used as green manure and also as fiber crop.
2. It helps in preventing leaching and the loss of nutrients when it mixes with the soil.
3. It also preserves the wetness of the soil.

Gaur:

1. It is mainly used for the conjunction of humans as a vegetable.
2. This crop is also used as a food for cattle and it is also a green manure crop.
3. It is a leguminous crop, therefore helping in fixing the nitrogen and making the soil fertile.

Explanation of the incorrect option:

Option B:

1. Wheat is a non-leguminous plant. Hence it does not help in fixing the nitrogen.
2. Soybean plants are legumes and in their nodules bacteria are present and from the air, it takes the nitrogen and fixes it into the soil.

Option C:

Xanthium and parthenium:

Without being cultivated these plants can grow in other plant fields and consume their water and nutrition for their growth. Therefore they are known as weeds.

Option D:

Cyperus and Rotundus:

1. It is widely very much distributed worldwide in tropical and temperate regions and is one of the most known interfering weeds.
2. It is also called the world's destructive weed as it is spread all over 90 countries and destroys 50 crops all over the world.

Final answer: Sun hemp and Gaur are the plants that are grown to produce green manure.