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प्रश्न
Give two examples of vestigial organs in human beings and plants.
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उत्तर
Vestigial organs are remains of a structure that were functional in some ancestor but is no longer functional in present body.
Some examples of such organs in humans are:
(a) Appendix: The appendix is a small projection of the side of the large intestine near the cecum. It looks kind of like a tail and is found near where the small and large intestines meet. No one knows the actual original function of the appendix.
(b) The tail bone: Attached to the bottom of the sacrum is the coccyx or tailbone. This small, bony projection seems to be a leftover structure of primate evolution. It is believed that human ancestors once had tails and lived in trees. The coccyx would be where the tail was attached to the skeleton.
Some examples of such organs in plants are:
(1) Sexual organs of dandelions: The common dandelion reproduces asexually through a process known as apomixis. However, they still have all of the functional parts that most flowering plants use to reproduce sexually, namely the stamen and pistil.
(2) Grass often has small, undeveloped structures that strongly resemble those of flowering plants.
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संबंधित प्रश्न
Mammals : _________ : : Amphibia : Fishes
What are vestigial organs?
(a) Select the homologous structures from the combinations given below:
(i) Forelimbs of whales and bats
(ii) Tuber of potato and sweet potato
(iii) Eyes of octopus and mammals
(iv) Thorns of Bougainvillea and tendrils of Cucurbita
(b) State the kind of evolution they represent.
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
Enlist any four sequential evolutionary names of human ancestors.
Name the scientists who Discovered the fossil of Australopithecus
What are homologous organs?
How do homologous organs help in providing evidence for organic evolution?
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
The forelimbs of a frog, a bird and a man show the same basic design (or basic structure) of bones. What name is given to such organs?
Out of bacteria, spider, fish and chimpanzee, which organism has a better body design in evolutionary terms? Give reason for your answer.
The presence of which of the following types of organs in two organisms indicates that they are derived from the same ancestor?
(a) analogous organs
(b) respiratory organs
(c) digestive organs
(d) homologous organs
Write the names of those animals in whom some vestigial organs in human body are functioning.
Explain with suitable examples importance of anatomical evidence in evolution.
Answer the following question.
Wisdom teeth : Vestigial organs :: Lungfish : ....................
_______ is a connecting link between Annelida and Arthropoda.
Complete the following chart:
Choose the correct option of the following question:
Wings of Insect and Birds are examples of :
Long answer question.
Would you consider wings of butterfly and bat as homologous or analogous and why?
Find an odd one out.
Appendix : vestigial organ : : Peripatus : ____________
Give scientific reason.
Vertebrates have slowly originated from invertebrates.
Give scientific reason.
Duck-billed platypus shows relationship with mammals.
Write a short note:
Embryological evidences
Enlist the evidences of evolution.
Observe the given images and answer the following questions.
- Which evolutionary evidence does it indicate?
- What does it prove?
- State another example of evolutionary evidence.
The degenerated and non-functional organs found in an organism are called ______.
Select vestigial organs from the following.
Which of these is not a vestigial organ in human beings?
Study of fossils is ______.
The process of mating of individuals, which are more closing related than the average of the population to which they belong is called ______.
The study of fossil evidence of evolution is called ______
Organs having similar functions but different origin and development are known as:
Which of the following is used as an atmospheric pollution indicator?
Animal husbandry and plant breeding programmes are the examples of ______.
What were the characteristics of life forms that had been fossilised?
What are we referring to? When we say 'simple organisms' or 'complex organisms'.
Explain natural selection with the example of industrial melanism.
Give one example of homologous organs found in plants.
