Which of the following strongly influenced Darwin when he formulated his theory of natural selection?
Correct answer D. Malthus's essay on population
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Agriculture MCQs
Page 63 of Agriculture multiple-choice questions with answers. Tap an option to check yourself.
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Hereditary variations in plants have been produced by using which agent?
Correct answer D. X-rays
When red (RR) is crossed with white (WW), all the RW offspring are pink. What does this show about the R allele?
Correct answer A. Incompletely dominant
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Why are haploids better for mutation studies, since every mutation, recessive or dominant, is expressed in them?
Correct answer B. There is only one allele of each gene in each cell
When red-flowered plants were self-pollinated, some of the 40 progeny plants had white flowers. What does this show about the parent plants?
Correct answer B. Heterozygous
What does epistasis mean?
Correct answer D. One pair of gene can completely mask the expression of another gene pair
Who proposed that human populations tend to increase faster than the food supply?
Correct answer C. Malthus
Which of the following scientists is associated with genetic engineering?
Correct answer D. Khorana
With incomplete dominance, what is seen in the F2 generation?
Correct answer A. Phenotypic ratio corresponds to the genotypic ratio
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Reciprocal recurrent selection is effective with which type of gene action?
Correct answer D. All the above
In oats, what is the result of an interspecific cross between Avena sativa and A. byzantina?
Correct answer C. Fully fertile
What is the prescribed minimum germination percentage for foundation seed of groundnut?
Correct answer D. 70
How can good germination be achieved in triploid (seedless) watermelon seed?
Correct answer A. Scarification
In which plant was gametophytic self-incompatibility first reported?
Correct answer D. Nicotiana sanderae
What is a gene that raises the natural mutation rate of another gene in the same genome called?
Correct answer D. Mutator gene
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Who first used the terms vertical resistance and horizontal resistance?
Correct answer C. Van der Plank (1963)
To which family do the largest number of vegetable crops belong?
Correct answer B. Cucurbitaceae
Leucaena leucocephala is a popular tree for which purpose?
Correct answer D. Nutritive forage
Who first showed that DNA is the genetic material?
Correct answer A. Avery et al (1944)
Under which condition do gene frequencies in a population stay constant?
Correct answer D. Random mating