Agronomy MCQ Question and Answer | Agriculture MCQ Question

Nitrogen fixation is the phenomenon of converting atmospheric nitrogen into nitrogen compounds which can be absorbed by the legume plants in the presence of microorganisms through a series of biochemical reactions.
The process of nitrogen fixation is increased by the application of phosphorus fertilizer to the soil. It enhances the symbiotic nitrogen fixation process in legume crops.

Plant available water is the capacity of any plant is the difference between the soil's water content at the drained upper limit and the crop lower limit. It is the maximum amount of water stored in a soil profile that can be used by plants.
A portion of capillary water is a type of plant available water.

Water is the most essential element for each organism present on Earth. Plants get nutrients from the air, water and soil.
All the essential nutrients are provided by these basic elements. But plants can be grown in the absence of soil like in the hydroponics method, but cannot be grown without water. Water is the element required for transporting nutrients to the plant.

Leaf water potential (LWP) is a useful index of soil water stress when experienced by plants.
When plants undergo water stress, under low availability of water, plants develop mechanisms to cope with water stress by decreasing LWP.
Air temperature, humidity, wind and soil water availability are the factors that affect LWP.

Composite variety is a variety developed by mixing the seeds of various phenotypically outstanding lines possessing similarities for various characteristics.
The first composite variety in India was released in 1967. The six maize composites were Ambar, Jawahar, Kissan, Vikram, Sona and Vijay.

Deficiency symptoms of boron can be observed on apical buds. Boron is an essential microelement for higher plants, its deficiency affects depression of growing points like root tip, bud, flower and young leaf and deformity of organs like root, shoot, leaf and fruit.

The clay particles are bound together because of force between them, but the presence of a large number of huge sodium ions which has lower charge density disrupts the force between the particles and hence it causes dispersion of clay particles especially when the soil is wet.

A total of 143 million hectares of geographic land is agricultural land in our country, out of which approximately 40% - 48% is rainfed, which relies on irrigation to fulfill the water requirements of the plants. And this percentage is about 50 million hectares.

The seed rate of potatoes is 15 - 18 quintals/hectare for round varieties and 20 - 25 quintals/hectare for oval varieties. While the yield of any cultivation depends upon the quality of the seed, soil type, irrigation, spacing, climate, rainfall, etc.

A Stevenson screen is a shelter or enclosure for meteorological instruments against precipitation and direct heat radiation from the outside environment. The screen should face pole wards, which means it should face north in the northern hemisphere and south in the southern hemisphere to keep the sun from shining directly on the thermometers and affecting the readings.