Agronomy MCQ Question and Answer | Agriculture MCQ Question

Wheat is a cereal grain and worldwide staple food.
The archaeological record suggests that wheat was first cultivated in the regions of the fertile crescent around 9600 BCE. It originated in the Mediterranean region, the "Cradle of civilization" in the Tigris and Euphrates river valleys.
While according to genetics, the origin of modern wheat is found in the Karacadag mountain region of what is today southeastern Turkey.

Ethylene is the chemical hormone used for degreening of citrus fruits.
Degreening is the process of removal of green colour from the skin of citrus fruit to show it is ripe and increase its market value. In this process, the measured amounts of ethylene gas are exposed to fruits under a controlled environment with specific temperatures and humidity.

The agricultural land area of India is divided into 15 agro-climatic zones and further divided into 72 more sub-divisions. It is based on soil type, climates, rainfall, etc.
These are:
1. Western Himalayan division
2. Eastern Himalayan division
3. Lower Gangetic plain region
4. Middle Gangetic plain region
5. Upper Gangetic plain region
6. Trans-Gangetic plain region
7. Eastern plateau and hill region
8. Central plateau and hill region
9. Western plateau and hill region
10. Southern plateau and hill region
11. East coast plain and hill region
12. West coast plain and hill region
13. Gujarat plain and hill region
14. Western plain and hill region
15. Island region

Plants with roots capable of penetrating rocks are termed chasmophytes. Chasmophytes grow in the fissures in rocks where soil or organic matter has accumulated. These plants are also known as Lithophytes, which grow in the crevices of rocks.
Xerophytes are the plants that grow in the desert area and adapted to live in a dry habitat.
Xanthophytes are yellow-green algae.

Calvin - Benson cycle is a series of biochemical redox reactions that take place in the stroma of chloroplast in photosynthetic organisms. This cycle was discovered by Melvin Calvin, James Bassham, and Andrew Benson at the University of California in the year 1950.
This cycle is present in C3 plants, C4 plants and also in CAM plants.

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.

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.

Urea is a nitrogenous fertilizer with the chemical formula CO(NH₂)₂.

In this compound, nitrogen exists in the amide form (–NH₂).

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 (NH₃) and then ammonium (NH₄⁺).

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.

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.

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.