Heterosis

Q. In maize, hybrid vigor is exploited by

1. Inducing mutations
2. Bombarding the seeds with DNA
3. Crossing of two inbred parental lines
4. Harvesting seeds from the most productive plants

Q. Phenomenon in which hybrids acquire the superior characteristics of both the parents is known as

1. Heterosis
2. Hybrid vigour
3. Inbreeding
4. Superiority

Q. I have four pure lines of plants - Line 1 - high yielding ; Line 2 - disease resistant; Line 3 - disease resistant , medium yield; Line 4 - High yielding, susceptible to disease. Which combination of these lines will lead to heterosis in the F1 hybrid?

1. Line 1 and Line 2
2. Line 3 and Line 4
3. Line 1 and Line 3
4. Line 2 and Line 3

Q. Hybrid vigour is mostly due to

1. Homozygosity of the pure characters
2. Superiority of all the genes
3. Heterozygosity
4. Mixing of the male and the female cytoplasm

Q. With regards to the assertion and reason, choose the correct option.
Assertion: In case of vegetatively propagated crops, pure line selection is not required.
Reason: Hybrid vigour is a property of vegetatively propagated plants.

1. Both the assertion and reason are true and the reason is the correct explanation for the assertion.
2. Both the assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but the reason is false
4. Both the assertion and reason are false.

Q. Phenomenon in which hybrids acquire the superior characteristics of both the parents is known as

1. Heterosis
2. Hybrid vigour
3. Inbreeding
4. Superiority