Agronomy MCQ Question and Answer | Agriculture MCQ Question

Uttar Pradesh is divided into 9 agro-climatic zones based on rainfall and soil types.
These are:
1. Tarai
2. Western Plain
3. Central western Plain
4. South Western Semi-Arid Plain
5. Central Plain
6. Bundelkhand
7. North Eastern Plain
8. Eastern Plain
9. Vindhyan Area

The relationship between water and fertilizer as production factors in crops is Synergetic which means a cooperative mode of relation. Availability and absorption of fertilizer by plants depend upon the presence of water in the soil. Fertilizers provide all the essential nutrients to the plants through the soil and are absorbed and transferred to plants only in the presence of water.

As per the Botanists, there is a total of 17 essential nutrients required by the plants for proper growth and development. These are Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Potassium, Sulphur, Calcium, Magnesium, Boron, Chlorine, Copper, Iron, Manganese, Molybdenum, Zinc and the last one is Nickel.

Crown roots in wheat are those roots that emerge below the soil surface but above the seed that is at nodes above the coleoptile node.
Crown roots are the secondary roots, which began with the appearance of tillers.

The wet bed nursery is an area for germinating seeds of rice where there is enough water for irrigation. The soil in the field should be thoroughly puddled and leveled with proper drainage canals.
Here, seedlings are ready for transplantation at an age of 20 - 25 days.

Phosphatase enzymes play a major role in the Mineralization of Organic Phosphates. It also removes a phosphate group from a protein.
These enzymes are produced by microorganisms in the soil and serve to remove a phosphate group from its substrate and transform the unavailable organic P into assimilable phosphate for the plants.

Potato needs fertilizers in optimum amounts to increase the tuber size, weight and quality and also to reduce the number of non- marketable tubers.
It requires Nitrogen, Phosphorus and Potassium in their external nutrition.

Out of the given options, Acidic soil has better physical conditions than Saline soil, Saline Alkali soil and Degraded Alkali soil.
Although, acidic soils have low availability of plant nutrients, such as phosphorus and molybdenum and increased availability of aluminum and manganese.

Fluchloralin is one of the herbicides composed of dinitroaniline and is used to prevent the growth of grasses and weeds in cultivated crops like soybean.
It is used in soybean as Pre-plant incorporation. As fluchloralin is a pre-sowing selective or pre-emergence herbicide.

Paraquat is one of the non-selective herbicides while others Alachlor, Butachlor and Atrazine are selective Herbicides.
Non-selective herbicides are those that can affect and kill any plant they will come in contact with not like selective ones that will target only a specific type. Non-selective can harm the main crop plant also on the application.