Genetics And Plant Breeding - Study Mode

[#576] Microsporogenesis occurs in
Correct Answer

(D) Anthers

Explanation

Solution: Microsporogenesis occurs in Anthers. Microsporogenesis in the anther involves the meiotic division of pollen mother cells, which each produce four microspores. These then undergo mitosis to form pollen grains (microgametophytes), which at maturity consist of only three cells, the tube cell and two non-motile sperm cells.

[#577] The flowers do not open at all is
Correct Answer

(A) Cleistogamy

Explanation

Solution: The flowers do not open at all in Cleistogamy. Cleistogamy means the formation of flowers that do not open and those flowers are classified as Cleistogamous flowers. It is a type of automatic self-pollination of certain plants that can propagate by using non-opening, self-pollinating flowers. Thus the production of seeds in such flowers is a result of autogamy.

[#578] Seed multiplication ratio in bajra is
Correct Answer

(C) 1 : 200

Explanation

Solution: The seed multiplication ratio in bajra is 1 : 200. It is the number of seeds to be produced from a single seed when it is sown and harvested. The process of seed planning involves the use of the Seed Multiplication Ratio (SMR) in the computation and estimation of seed demand in the country.

[#579] The process of making of seeds free from inert matter and defective seeds is
Correct Answer

(C) Physical purity

Explanation

Solution: The process of making seeds free from inert matter and defective seeds is Physical purity. It is the cleanliness of seed from other seeds, debris, inert matter, diseased seed, and insect-damaged seed. It also should be devoid of shriveled, diseased mottled, moulded, discoloured, damaged and empty seeds. Physical purity testing refers to the analysis for classifying the composition of a seed lot. It is important for evaluating whether the given seed sample conforms to the prescribed purity standards.

[#580] According to Harrington's thumb rule
Correct Answer

(D) All of the above

Explanation

Solution: According to Harrington's thumb rule, all the given options are correct that are: a. For every decrease of 1 % in seed moisture, the lifetime of the seed is doubled. b. For every decrease of 5°C in storage temperature the lifetime of the seed gets doubled. c. The second condition is applicable when the storage temperature is between 0°C and 50°C. HARRINGTON'S RULE: Seed longevity decreases by one-half for every 1% increase in moisture content or every 10°F (6°C) increase in temperature.