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प्रश्न
Complete the following diagram:
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उत्तर
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संबंधित प्रश्न
Four students P, Q, R and S differently reported the following set of organs to be analogous :
P. Forelimb of a frog and forelimb of a lizard
Q. Forelimb of a bird and forelimb of a human
R. Wings of a parrot and wings of a butterfly
S. Wings of a bird and wings of a bat
The two students who have reported correctly are :
(A) P and Q
(B) Q and R
(C) R and S
(D) P and S
Attempt giving a clear definition of the term species.
Explain with an example for the given, how the following provides evidence in favor of evolution in organisms :
Fossils
Explain the evolution of giraffe's neck according to Lamarck's theory of evolution.
The presence of which of the following types of organs in two animals indicates that they are not derived from a common ancestor?
(a) homologous organs
(b) excretory organs
(c) analogous organs
(d) reproductive organs
One pair of organs in the following animals are not homologous. This is :
(a) forelimbs in humans and lizard
(b) forelimbs in lizard and frog
(c) wings in butterfly and bat
(d) wings in bat and bird
X, Y, and Z are three animals. The animal X can fly but animal Y can only run on ground or walls. The forelimbs of animals X and Y have the same basic design but they are used for different purposes such as flying and running respectively. The animal Z became extinct an long time ago. The study of fossils of Z tells us that it had some features like those of X and some like those of Y. In fact, Z is said to form a connecting link in the evolutionary chain of X and Y.
(a) What could the animals X, Y and Z be?
(b) What name is given to the forelimbs like those of X and Y which have the same basic design but different functions?
(c) Name one feature in which Z resembled X.
(d) Name one feature in which Z resembled Y.
(e) Which is the correct evolutionary chain involving X, Y and Z : X → Z → Y or Y → Z → X?
Explain any three molecular (genetic) evidences in favour of organic evolution.
Appendix : vestigial organ : : Peripatus : ____________
A human hand, a front leg of a cat, a front flipper of a whale and a bat’s wing look dissimilar and adapted for different functions. What is the name given to these organs?
How do you differentiate homologous organs from analogous organs?
Which of these is not a vestigial organ in human beings?
The fossil remains of Archaeopteryx is a connecting link between ______
Palaeontological evidence for evolution refers to the ______.
Organs having similar functions but different origin and development are known as:
Animal husbandry and plant breeding programmes are the examples of ______.
What were the characteristics of life forms that had been fossilised?
The evolutionary story of moths in England during industrialisation reveals, that 'evolution is apparently reversible'. Clarify this statement.
Explain natural selection with the example of industrial melanism.
Evolutionary convergence is the development of a ______.
