Question 18
According to the evolutionary theory, formation of a new species is generally due to

(a) sudden creation by nature
(b) accumulation of variations over several generations
(c) clones formed during asexual reproduction
(d) movement of individuals from one habitat to another

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Solution

(b) accumulation of variations over several generations

Evolutionary theory is a theory of biological evolution developed by Charles Robert Darwin and others, stating that all species of organisms arise and develop through the natural selection of small, inherited variations that increase the individual's ability to compete, survive, and reproduce. It occurs due to the accumulation of variations over several generations.

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Question 21
Reproduction is essential to living organisms in order to

(a) keep the individual organism alive
(b) fulfil their energy requirement
(c) maintain growth
(d) maintain the continuity of species from one generation to another generation

Q. Question 15
Which of the following statements is not true with respect to variation?

(a) All variations in a species have equal chance of survival.
(b) Change in genetic composition results in variation.
(c) Selection of variants by environmental factors forms the basis of evolutionary processes.
(d) Variation is minimum in asexual reproduction.

Q. Assertion :Algae and fungi switch to asexual method of reproduction before the onset of adverse conditions. Reason: Asexual reproduction may introduce variations and leads to the formation of many clones.

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Question 18 According to the evolutionary theory, formation of a new species is generally due to (a) sudden creation by nature (b) accumulation of variations over several generations (c) clones formed during asexual reproduction (d) movement of individuals from one habitat to another

Question 18
According to the evolutionary theory, formation of a new species is generally due to

(a) sudden creation by nature
(b) accumulation of variations over several generations
(c) clones formed during asexual reproduction
(d) movement of individuals from one habitat to another