Agronomy - Study Mode

[#986] The major component of biogas generated from cow-dung is
Correct Answer

(D) CH 4

Explanation

Solution: Methane is the major constituent of biogas generated from cow dung. It contains approximately 75% of methane gas and 25% of carbon dioxide, some other gases like hydrogen, hydrogen sulphide, water vapour, nitrogen, oxygen and ammonia.

[#987] Total cultivated area in India is close to
Correct Answer

(C) 180 mha

Explanation

Solution: The area that corresponds to the total sown area is termed the area under cultivation. And the total cultivated area in India was approximately 155.2 million hectares as per the survey held in the fiscal year 2015, which is now increased to 180 mha.

[#988] If a plant shows extensive interveinal chlorosis of the older leaves and late this reaches the younger leaves, the symptoms is due to lack of
Correct Answer

(A) Magnesium

Explanation

Solution: The condition of extensive interveinal chlorosis of older leaves which later infects the younger leaves is due to a deficiency of magnesium. Sometimes it causes reddish brown tints and early leaf fall. Magnesium deficiency is common in tomatoes, apples, grapevines, raspberries, roses and rhododendrons.

[#989] The ginning percentage in cotton can be worked out by the formula
Correct Answer

(B) $$frac{{{ ext{Weight of lint}}}}{{{ ext{Weight of seed cotton}}}} imes 100$$

Explanation

Solution: Ginning is the process of transforming cotton from field to fabric while ginning percentage is calculated mathematically through a formula: $${ ext{GP}}\% = frac{{{ ext{Weight of link}}}}{{{ ext{Weight of seed cotton}}}} imes 100$$ Out turn of lint to seed is expressed as a percentage by weight and it normally varies between 24% - 38%.

[#990] Bacteria responsiblefor N fixation in soybean is
Correct Answer

(C) R. japonicum

Explanation

Solution: Different variety of the same category is nitrogen-fixing bacteria also called Rhizobium is responsible for fixing atmospheric nitrogen in different leguminous plants. The bacteria responsible for nitrogen fixation in soybean is R. japonicum . It forms a symbiotic relationship with host plants.