Agronomy MCQ Question and Answer | Agriculture MCQ Question

Humus is dark organic matter present in fertile nutrient rich soil. It is an example of organic colloids, which means it is a mixture of tiny organic matter that cannot decay further or that are resistant to decay. Humus significantly affects the bulk density of soil and contributes to its retention of moisture and nutrients.

The top cross means the first generation of the cross, a single cross (A × B) with an open pollinated variety. Whereas a single cross is crossing between two inbreds or varieties. Hence, A and B are inbred lines or simple hybrids.

A chelating agent is a chemical compound that reacts with metal ions to form stable, water soluble metal complexes.
EDTA – Ethylenediamine tetraacetic acid is a chelating agent.
EDDHA – Ethylenediamine-N, N'-bis (2-hydroxyphenyl acetic acid) is also a chelating agent.
HEDTA – Hydroxyethylenediaminetriacetic acid. It can also chelate to form salts.
Thus, CDMA is a nonchelating agent.

Dr. Norman Borlaug, genetics, plant pathologist and Nobel prize winner, developed the dwarf variety of wheat in mid 1940 - 50 to increase wheat yields and make the country self-sufficient in food production.

Black soil is also known as Black cotton soil. It contains a high amount of clay with low Organic matter. It also contains calcium, carbonate and potash, and holds moisture. It is also rich in lime, iron and magnesium with traces of phosphorus and nitrogen. It is more fertile in low lands than on the uplands.

Senescence in plants means the process of aging. Plants have two types of senescence one that is stress induced other is age related developmental aging. The phytohormone that reduces the effect of the senescence process is Gibberellin.

Wheat is a rabi crop, and the optimum temperature required for proper grain filling of the wheat crop is 23°C - 25°C. Wheat crop is very sensitive to high temperature during reproductive stages compared to vegetative stages.

The highest production of mustard in India is in the state of Rajasthan, which is why it is also called as ‘mustard state’ of India.
It is expected to increase to 49.50 lakh tonnes in 2021 - 22 from 35 lakh tonnes in the previous year. Rajasthan produces 47.26%, Haryana 11.73%, Madhya Pradesh 11%, Uttar Pradesh 10% followed by West Bengal 7% of mustard respectively.

National Research Centre for Medicinal & aromatic plants was established on 24^th November 1992 at Boriavi In Anand District of Gujarat. It works under ICAR.
India is rich in flora and fauna with more than 5000 species of known medicinal and aromatic plants. It deals in plant genetic resource management, crop variety improvement, and the production of aromatic and medicinal plants.

Rice is the essential cereal crop that occupies the highest agricultural area under cultivation in our country. India had approximately 45 million hectares of land area.
India is the world's second largest producer of rice, and the largest exporter of rice in the world, and rice is the first highly produced cereal in our country. Production has increased to 120 million tons in the financial year 2020 - 21.