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प्रश्न
"Only variations that confer an advantage to an individual organism will survive in a population". Do you agree with this statement? Give reason for your answer.
उत्तर
Yes, we agree with the statement. Some changes always appear when animals produce their progeny by sexual reproduction. One of the progeny may be taller than the other. The advantage of long legs to the progeny is that when no food is available on the ground, those with long legs can reach the leaves on tall trees, eat them and survive. On the other hand, the progeny that are short cannot reach the leaves on tall trees. They will not get any food and eventually die from starvation. Now, since long legs are a beneficial variation, the long-legged animals will live long enough to produce their offsprings. So, all the future generations will be long-legged.
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संबंधित प्रश्न
Fill in the following blank with suitable word :
The human forelimb and bat's forelimb are an example of .......... organs whereas an insect's wing and a bat's wing are an example of ........... organs.
In what way are homologous organs evidence for evolution?
A gradual change, over a long period, in a form of life is known as :
(a) erosion
(b) evolution
(c) revolution
(d) evaluation
A population of red beetles lives in green bushes in a garden. Once during the process of breeding, a green beetle is produced.
(a) State whether the change in colour of beetle is a process of evolution or not.
(b) Can the new colour of green beetle be passed on to its next generations?
(c) What will be the advantage (if any) of the green colour to the beetle?
(d) State whether the production of green colour involved a change in genetic material or not.
State the meaning of inherited traits and acquired traits. Which of the two is not passes on the next generation? Explain with the help of an example.
Very short answer question.
Define the Gene pool
Evolution occurs as a result of mutations in ______.
Which of the following is the correct pair?
The first fossil of human form, discovered was ______.
While studying the stages in the evolution of man, a well-developed chin is observed in ______.
