Genetics And Plant Breeding - Study Mode

[#231] Which one of the following crops is often cross-pollinated?
Correct Answer

(B) Groundnut

Explanation

Solution: Groundnut crop is often cross-pollinated. In some crop plants, cross-pollination often exceeds 5 percent and may reach 30 percent. Such species are generally known as often cross-pollinated species. About 1.0 to 3.9% of cross-pollination has been reported to take place naturally in groundnut. Several bee species are the pollinators in the out-crossing of groundnuts.

[#232] A micronutrient is one which?
Correct Answer

(D) Is required in very small amount but is as important as a major element

Explanation

Solution: A micronutrient is required in very small amounts but is as important as a major element. Micronutrients are essential dietary elements required by organisms in varying quantities throughout life to orchestrate a range of physiological functions to maintain growth and development. There are about seven nutrients essential to plant growth and health that are only needed in very small quantities, and these are Boron, chlorine, copper, Iron, Manganese, Molybdenum and Zinc.

[#233] Superiority of hybrid over both of its parents is called
Correct Answer

(B) Heterosis

Explanation

Solution: The superiority of a hybrid over both of its parents is called Heterosis. Heterosis refers to the phenomenon that progeny of diverse varieties of a species or crosses between species exhibit greater biomass, speed of development, and fertility than both parents. It is the improved or increased function of any biological quality in a hybrid offspring. An offspring is heterotic if its traits are enhanced as a result of mixing the genetic contributions of its parents.

[#234] Mendok is used for inducing male sterility in:
Correct Answer

(D) Zea mays

Explanation

Solution: Mendok is used for inducing male sterility in Zea mays. Male-sterile plants are those that fail to produce functional pollen grains. In maize, male sterility can result from either nuclear or mitochondrial gene mutation. Mendok is an herbicidal compound with gametocidal properties used for inducing male sterility in Maize.

[#235] Hybrid vigour is exploited maximum in
Correct Answer

(D) Maize

Explanation

Solution: Hybrid vigour is exploited maximum in Maize. Hybrid vigor is the increase in stature, biomass, and fertility that characterizes the progeny of crosses between diverse parents such that the F1 is superior to the better of the two parents. Heterosis describes the superior phenotypes observed in hybrids relative to their inbred parents. Maize is a model system for studying heterosis due to the high levels of yield heterosis and commercial use of hybrids.