Question

A desired improved variety of economically useful crops are raised by
A. Mutation
B. Hybridization
C. Biofertilizers
D. Natural selection

Answer 1

Plant breeding is the method used to increase the variety of plants for human welfare. The key methods of crop enhancement are Introduction, selection, hybridization, and mutation breeding along with polyploid breeding, tissue culture, and genetic engineering.

Complete answer: Hybridization is the development of new varieties by crossing two or more genetically modified plants. Hybridization involves having a cross between the two parents so that the progeny with the desired features can be obtained. The hybridization between the deux plants is called a single cross and is called multiple crosses between more than two parents. (e.g. wheat variety development).
-Mutation breeding is a quick way to add sudden changes to the plant genome.
-Biofertilizer is a compound comprising living or dormant cells of microorganisms. As an application to their seeds, the plant surface or soil by colonizing the plant's rhizosphere, biofertilizers increase host plant nutrients. In contrast to chemical fertilizers, biofertilizers are more cost-effective.
-Natural Selection: The mechanism by which populations of living organisms adapt and adjust is natural selection. Individuals are inherently variable in a population, meaning that they are all different in certain ways. This difference suggests that certain people have characteristics that are better suited to the setting than others.
Therefore, choice B-Hybridization is the correct answer.

Note: The purposeful manipulation of plant species is plant breeding so that desired genotypes and phenotypes can be produced for specific purposes. It was used for improving the quality of diet in human and animal products, increasing crop yields, improving quality, making plants more pathogens resistant, improving tolerance of insect pests.