Agronomy - Study Mode
[#256] Which one of the following in the variety of sorghum?
Correct Answer
(A) Pusa Chari
Explanation
Solution: Sorghum is native to Africa with many cultivated forms and is an important crop worldwide. It is used for food, animal fodder, the production of alcoholic beverages and biofuels. Pusa chari is identified as a promising multicut forage sorghum hybrid resistant to various diseases with good yield.
[#257] After China and USA, which among the following is the largest producer of fertilisers?
Correct Answer
(B) India
Explanation
Solution: China is the largest producer and consumer of fertilizer with an output of 28.9 million metric tons. India is the third largest producer of fertilizer in the world after China and USA. The actual production of all the fertilizers was about 462.15 LMT in the year 2019 - 20.
[#258] In which form urea provides nitrogen?
Correct Answer
(A) Amide form
Explanation
Solution: Urea is a nitrogenous fertilizer with the chemical formula CO(NH 2 ) 2 . In this compound, nitrogen exists in the amide form (–NH 2 ) . When urea is applied to the soil, it does not immediately release ammonical nitrogen . Instead, it first undergoes enzymatic hydrolysis by the enzyme urease , producing ammonia (NH 3 ) and then ammonium (NH 4 + ) . These are forms of ammonical nitrogen that plants can absorb. So, while plants eventually take up nitrogen in the ammonical form, the form in which urea initially provides nitrogen is the amide form . Why some people think the answer is Option B (Ammonical form): Because urea is rapidly converted in soil to ammonium, many people associate it directly with the ammonical form. However, the question is about the form in which urea provides nitrogen — not what it becomes later. So technically and accurately, the correct answer is amide form . Conclusion: Urea provides nitrogen in the amide form , which is later converted in the soil to ammonical form for plant uptake. Hence, the correct answer is Option A: Amide form .
[#259] ICRAF is situated in the country
Correct Answer
(A) Kenya
Explanation
Solution: ICRAF stands for International Centre for Research in Agroforestry and it is an international institute headquartered in Nairobi, Kenya and formed in 1978. It specializes in the sustainable management, protection and regulation of tropical rainforests and natural reserves.
[#260] Frost damage in crop is due to
Correct Answer
(D) Cell breakup because of water expansion
Explanation
Solution: A hard frost freezes water in the plant cells, causes dehydration and damage to the cell, and this phenomenon is termed frost damage. It causes much damage to the crop due to cell breakup because of water expansion.