Genetics And Plant Breeding - Study Mode

[#351] The structure of chromosome can be observed best during
Correct Answer

(B) Metaphase

Explanation

Solution: The structure of chromosomes can be observed best during Metaphase. Metaphase is a stage of mitosis in the eukaryotic cell cycle in which chromosomes are at their second-most condensed and coiled stage. These chromosomes, carrying genetic information, align in the equator of the cell before being separated into each of the two daughter cells. During metaphase, the nucleus dissolves and the cell's chromosomes condense and move together, aligning in the center of the dividing cell.

[#352] Cryopreservation is not suitable for preserving organisms which are
Correct Answer

(C) Aerobic

Explanation

Solution: Cryopreservation is not suitable for preserving Aerobic organisms. It is a process where organisms, organelles, cells, tissues, extracellular matrix, organs, or any other biological constructs susceptible to damage caused by unregulated chemical kinetics are preserved by cooling to very low temperatures using liquid nitrogen. Cryopreservation methods seek to reach low temperatures without causing additional damage caused by the formation of ice crystals during freezing.

[#353] Seed replacement ratio of Pearl millet is
Correct Answer

(A) 1 : 200

Explanation

Solution: The seed replacement ratio of Pearl millet is 1 : 200. It is a measure of how much of the total cropped area was sown with certified seeds in comparison to farm-saved seeds. In other words, it is the percentage of area sown out of the total area of the crop planted in the season by using certified/quality seeds other than the farm-saved seed. In simple terms, it is a measure of the cropped area covered with quality seed.

[#354] Resistance exhibited by young seedlings is called
Correct Answer

(D) Seedling resistance

Explanation

Solution: Resistance exhibited by young seedlings is called Seedling resistance. Seedling resistance is resistance that begins in the seedling stage of plant development and continues throughout its lifetime. It is typically expressed at all growth stages, conferred by a single 'major effect' gene often associated with a hypersensitive response, and is often race-specific.

[#355] The ecological suicide occurred in cotton is due to
Correct Answer

(C) Ethylene

Explanation

Solution: The ecological suicide that occurred in cotton is due to Ethylene.