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प्रश्न
Read the following statement and justify the same in your own words with the help of a suitable example.
There is evidence of foetal science among chordates.
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उत्तर
- Early embryos of fish, amphibians, reptiles, birds, and mammals have very similar structures.
- As they continue to expand, they develop new patterns.
- The earliest commonality of vertebrate embryos demonstrates that all vertebrate classes shared a common ancestor during evolution.
- This is known as embryological evidence for vertebrate evolution.
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संबंधित प्रश्न
Select two pairs from the following which exhibit divergent evolution. Give reasons for your answer.
(i) Forelimbs of cheetah and mammals
(ii) Flippers of dolphins and penguins
(iii) Wings of butterflies and birds
(iv) Forelimbs of whales and mammals
How analogy and homology considered as an evidence in support of evolution ?
Attempt giving a clear definition of the term species.
Select and write analogous structures from the list given below :
1) Wings of butterfly and birds
2) Vertebrate hearts
3) Tendrils of Bougainvillea and Cucurbita
4) Tubers of sweet potato and potato
Wing of an insect and forelimb of a bird are :
(a) analogous organs
(b) analeptic organs
(c) homologous
(d) homophobic organs
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?
Write a short note based on the information known to you.
Embryology
Complete the following chart:
Find an odd one out.
Write a short note:
Embryological evidences
Biogenetic law states that ______.
Select the correct statement.
Where is carbon dating used?
Define vestigial organs.
Palaeontological evidence for evolution refers to the ______.
Organs having similar functions but different origin and development are known as:
You have studied the story of Peppermoths in England. Had the industries been removed, what impact could it have had on the moth population? Discuss.
Evolutionary convergence is the development of a ______.
Give one example of homologous organs found in plants.
