Agronomy MCQ Question and Answer | Agriculture MCQ Question

Ion exchange is the exchange of ions in any crystal or on any surface. Ion exchange in clay minerals occurs because clay minerals can absorb cations from the solution while the absorption of anions from the solution is very less.
While sodium cation has a low absorption capacity on clay and it is influenced by the composition and salinity of the solutions.

P. M. A. stands for Phenyl Mercuric Acetate is an odorless, crystalline powder, which is more often used as an herbicide, antiseptic, catalyst, fungicide and preservative for latex paints.
P. M. A. induces stomatal closure and thus acts as an antitranspirant when used at low concentrations for a short duration.

Our Earth's atmosphere is composed of about 78% nitrogen, 21% oxygen, 0.9 % argon and 0.1% of all other gases like carbon dioxide, methane, water vapour and neon.
Argon is the third most abundant noble gas in the earth’s atmosphere at 0.934%.

Oryza sativa is the scientific name of Asian rice and is a diploid species with two sets of 12 chromosomes. The genome of rice is composed of 24 chromosomes and has a total length of 430 megabases.

A composite cultivar is a variety that is developed by mixing the seeds of various phenotypically outstanding lines possessing similarities for different characteristics like height, seed size, colour and maturity.
A synthetic variety is developed by intercrossing several genotypes of known superior combining ability.
In maize cultivation, both composite and synthetic cultivars are used.

The acid equivalent is that portion of a formulation that theoretically could be converted back to the corresponding parent acid. Concerning fertilizer, it can be defined as the acidity developed by a fertilizer when applied to soils, measured in terms of calcium carbonate required for its neutralization.
The acid equivalent of urea is 80.

Paddy fields occupy the maximum area in India of about a 45 million hectares of total agricultural land as of the end of the fiscal year 2021. Rice is the principal crop of our country.
West Bengal is the largest producer of rice in our country and occupies more than 50% of its arable land for rice cultivation.

Potato is the starchy tuber of the family Solanaceae.
It is the herbaceous perennial and is mostly grown as a rainfed crop.
The main crop of potato is sown in the 3^rd week of October i.e. from 15^th October to 25^th October. While in the plains the spring crop of potato is grown and sown in January.

Tillering stage is the physiological process of continuous underground branching of compact node joints of the main shoot. It usually starts when the plant has three or four leaves.
The ideal temperature range for tillering stage in wheat is 16 - 20 degrees Celcius.

Gossypium hirsutum is a group of cotton commonly known as upland cotton, American cotton, Mexican cotton, etc and it accounts for over 90% of production.
It includes several varieties or crossbred varieties with varying fiber lengths and tolerances to several growing conditions.