Question

India's wheat yield revolution in the 1960s was possible primarily due to the?
A) Hybrid seeds
B) Increased chlorophyll content
C) Decreased chlorophyll content
D) Mutation resulting in plant height reduction

Answer 1

Hint: Genotype is a set of genes in DNA responsible for unique traits or features. It is the physical appearance or characteristic of an organism. In phenotype, quantitative traits can be different in degree and can contribute to the polygenic effect.

Complete step-by-step answer:
Polygenic trait refers to a trait that is controlled by multiple allelic genes. These are called polygenes. They are a group of genes that when turned on are expressed as a unit. Quantitative trait i.e., a product of two or more genes and their environment. Quantitative trait Mutation means high-yielding varieties that provide the quantity to crop production.
The green revolution began in 1960 but originally it was started in 1953 with the introduction of high-yield crop varieties and applications of modern agricultural techniques that led to an increase in food production in India. The main development was higher yielding varieties of wheat by insertion which resulted in plant height reduction. Many scientists used the Rht gene from norin10 for height reduction of the plant. DR. Norman Borlaug(America) and DR. M.S Swaminathan(India) used the Rht gene from Norin10. For height reduction of the plant.
Here we do not see any mutation so the 4th option is incorrect. And at that time scientists didn’t use hybrid seeds. In this explanation, there is no increase in chlorophyll increased or decreased content
Hence the correct answer is option d.
Note: Dr. M.S. Swaminathan is the father of the green revolution and Vurghese kurein is the father of the white revolution. The purpose of this revolution was to increase the yield of grains in India.