Genetics And Plant Breeding - Study Mode
[#436] Tabacco, safflower, jowar, jute is the
Correct Answer
(B) Ofter cross-pollinated crops
Explanation
Solution: Tabacco, safflower, jowar and jute is the Ofter cross-pollinated crops. In many self-pollinating species, cross-pollination may occur up to 5% or even reach 30%, such species are referred to as often cross-pollinating species. The production differences between India and those nations are substantial in the cross and often cross-pollinated crops compare to self-pollinated crops. Commercial crops like cotton and tobacco are included in often cross-pollinated crops category.
[#437] Purity % of Nucleus seed is
Correct Answer
(A) 100%
Explanation
Solution: The purity % of the Nucleus seed is 100%. It is the initial amount of pure seed of improved variety or parental lines of a hybrid produced under the supervision of the plant breeder who has evolved that variety or hybrid. The nucleus seed is genetically cent percent pure and does not contain other physical impurities.
[#438] Removal of awns in cereals is done by
Correct Answer
(D) Debearder
Explanation
Solution: Removal of awns in cereals is done by Debearder. The awn, a bristle-like extension from the lemma in the floret, is one of the distinct morphological and physiological traits in grass species. Awns are an evolutionary trait assisting seed dispersal and germination and increasing photosynthesis. Debearders (deawners) are used to remove appendages from seeds that are difficult to clean with air-screen separators. The debearder consists of a rotating shaft inside a steel cylinder.
[#439] Specific combining ability is tested for development of
Correct Answer
(B) Synthetics
Explanation
Solution: Specific combining ability is tested for the development of Synthetics. Specific combining ability (SCA) is the relative performance of a cross that is associated with non-additive gene action, predominantly contributed by dominance, epistasis, or genotype-environment interaction effects, and is directly related to the breeding value of a parent. A synthetic variety is developed by intercrossing several genotypes of known superior combining ability i.e., genotypes that are known to give superior hybrid performance when crossed in all combinations.
[#440] The hybrid Varalaxmi is the product of
Correct Answer
(C) Intraspecific hybridization between Gossypium hirstum and Gossypium barbadense
Explanation
Solution: The hybrid Varalaxmi is the product of Intraspecific hybridization between Gossypium hirstum and Gossypium barbadense. Two years after the release of H 4, the world’s first interspecific hybrid between G.hirsutum and G.barbadense was released from the cotton Research Sciences, Bangalore under the name “Varalaxmi”. It was released for cultivation in Karnataka state, but later on spread to other states such as Tamil Nadu, Andhra Pradesh and Maharashtra under irrigated areas.