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प्रश्न
Write the names of those animals in whom some vestigial organs in human body are functioning.
Write name of those animals in which these vestigial organs are functional.
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उत्तर
- It is useful in monkeys and other animals, such as rabbits, cows, and horses, for the movement of the ear pinna.
- Appendix is fully functional in ruminants for the digestion of cellulose.
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संबंधित प्रश्न
Give two examples of vestigial organs in human beings and plants.
Explain the terms analogous and homologous organs with examples.
Wing of an insect and forelimb of a bird are :
(a) analogous organs
(b) analeptic organs
(c) homologous
(d) homophobic organs
There are five animals A, B, C, D and E. The animal A uses its modified forelimbs for flying. The animal B uses its forelimbs for running whereas the animal C uses its forelimbs for grasping. The animal D can live on land as well as in water and uses its forelimbs to prop up the front end of its body when at rest. The animal E which respires by using spiracles and tracheae uses wings for flying but its wings are analogous to the modified forelimbs of animal A.
(a) What could the animals A, B, C, D and E be?
(b) Why are the forelimbs of animals A, B, C, D called homologous organs?
(c) What does the existence of homologous organs in animals A, B, C and D tell us about their ancestors ?
(d) Why are the modified forelimbs of animal A and the wings of animal E called analogous organs?
(e) State whether animals A and E have a common ancestor or not.
Vestigial organ ______ present in human body is proof of evolution.
The most common types of fossils are ------------------------.
What are homologous structures?
Similarities in the initial stages indicate the _______ evidence.
Find an odd one out.
Name the parts shown in the diagram.
Human jaw
Give scientific reason.
Duck-billed platypus shows relationship with mammals.
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?
Appearance of antibiotic-resistant bacteria is an example of ______.
Fossils are generally found in ______.
Did aquatic life forms get fossilised? If, yes where do we come across such fossils?
How do we compute the age of a living tree?
How do we compute the age of a rock?
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.
Find the odd one out:
