Agronomy - Study Mode

[#456] The panicle initiation stage in rice plants comes
Correct Answer

(B) After maximum tillering stage

Explanation

Solution: There are three main stages in the complete life cycle of the rice plant which are vegetative (from seed germination to PI), reproductive (from PI to flowering), and ripening (from flowering to grain maturity). PI is Panicle Initiation, a stage in which its top part, the inflorescence is grown, it comes after the maximum tillering stage and it ends approximately in 60 days.

[#457] Most critical weed competition period is upto . . . . . . . . months after transplanting exist in sugarcane.
Correct Answer

(B) 4

Explanation

Solution: First of all the critical period of weed competition can be defined as the period between early growth during which weeds can grow without affecting crop yield and the point after which weed growth does not affect the yield. It is approximately $${frac{1}{3}^{{ ext{rd}}}}$$ of the duration of the crop. And in the case of sugarcane, it is approximately 4 months.

[#458] The Indeterminate, determinate nature in Soybean is controlled by . . . . . . . . gene.
Correct Answer

(D) DT1, DT2

Explanation

Solution: Gene is the smallest controlling unit and each one is available to control the existence of every character in an organism. In the case of the soybean plant, the indeterminate and determinate nature of stem phenotype is controlled by DT1 and DT2 genes.

[#459] Effect of higher plants to lower plants is known as
Correct Answer

(C) Allelopathy

Explanation

Solution: Allelopathy is defined as the effects of a plant on the development of neighboring plants through the release of secondary compounds. It is the effect of higher plants to lower plants. Polygamy is the phenomenon of having both male, and female flowers on the same plant. Cryptogam is the phenomenon when a plant reproduces with the help of spores.

[#460] 'Tarai' soils are deficient in
Correct Answer

(D) Zinc

Explanation

Solution: Tarai is a region of northern India and southern Nepal running parallel to the lower ranges of the Himalayas. A strip of undulating former marshland, it stretches from the Yamuna river in the west to the Brahmaputra River in the east. Tarai soils are rich in nitrogen and organic matter but are deficient in Zinc.