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प्रश्न
Write avian characters of Archaeopteryx.
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उत्तर
- Feathery exoskeleton.
- Forelimbs are modified into wings.
- Jaws are modified into beak.
- Skull bone is completely fused.
- Large rounded cranium.
- Cranium with large orbits and a single condyle.
- Limb bones are bird like.
- Hind limbs with four toes first toe is opposible.
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संबंधित प्रश्न
Give two examples of vestigial organs in human beings and plants.
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
Explain with an example for the given, how the following provides evidence in favor of evolution in organisms :
Analogous organs
Vestigial organ ______ present in human body is proof of evolution.
Answer the following question.
Wisdom teeth : Vestigial organs :: Lungfish : ....................
What are homologous structures?
Find an odd one out.
Did aquatic life forms get fossilised? If, yes where do we come across such fossils?
What is the function of the appendix of our digestive system?
Industrial melanism in England after 1850 is an excellent example of Natural selection. Explain how?
