Agronomy - Study Mode

[#136] Major constituent of cotton fibre is
Correct Answer

(A) Cellulose

Explanation

Solution: Cotton is the soft fiber that grows around the seeds in the seed pod or boll of the cotton plant. Each fibre is a single elongated cell that is flat twisted and ribbon like with a wide inner hollow. Cotton fibres are comprised of 88% - 97% of cellulose, while the remaining constituents are wares, proteins, and pectin.

[#137] The first wheat variety having short plant height, lodging resistance and higher grain yield was
Correct Answer

(B) Norin-10

Explanation

Solution: Norin 10 is the first wheat variety to have short plant height, lodging resistance, and higher grain yield. It is a semi-dwarf wheat cultivar with a very large ear that was bred by Gonjiro Inazuka at an experimental station in Japan. It grew just 2 feet tall, provided with two genes, Rht1 and Rht2 , that resulted in the reduced height of the plant.

[#138] Maize-potato-sugarcane-ratoon-green gram is the example of crop rotation for
Correct Answer

(B) 3 year

Explanation

Solution: Crop rotation is the practice of growing different crops sequentially on the same field to improve soil health, optimize nutrients in the soil, and combat pest and weed pressure. Maize-potato-sugarcane-ratoon-green gram is an example of crop rotation for 3 years.

[#139] Plants that grows on extremely dry soils are placed under
Correct Answer

(B) Xerophytes

Explanation

Solution: A Xerophyte is a species of plant that is adapted to survive in an environment with less water or in extremely dry soils. Example: cacti, pineapple. A Hydrophyte is a plant species that live in water and adapt to its environment. Example: Valisineria, Hydrilla. Thallophyta is a polyphyletic group of non-mobile organisms that are grouped based on the same characteristics. Example: Spirogyra, Ulothrix. Hydroponics is the method of growing plants without soil.

[#140] Which of the following is cash crop?
Correct Answer

(A) Groundnut

Explanation

Solution: A cash crop is a profitable crop that is grown to sell for profit. Cash crops are usually crops that attract demand in more developed nations and hence have some export value. Out of the following options, groundnut is an important cash crop in our country. Groundnut farming in India is done on 85 lakh hectares of land and the highest productivity is from Tamil Nadu.