Advertisements
Advertisements
Question
Vestigial organ ______ present in human body is proof of evolution.
Options
Human hand
Appendix
Ear muscles
Tail-bone
Gradual development
Mutation
Gene
Transcription
Translocation
Advertisements
Solution
Vestigial organ appendix present in human body is proof of evolution.
Explanation:
The appendix, which is useless to humans, is a useful and fully functional organ in ruminants. Similarly, muscles of the ear pinna, which are useless to humans, are useful in monkeys for the movement of the ear pinna. Various vestigial organs like the tailbone (coccyx), wisdom teeth, and body hairs are present in the body of a human being.
Notes
Above question has three possible answers, [Option (B), (C) and (D)].
RELATED QUESTIONS
Study the following statements:-
I. Wings of birds and wings of bats are homologous organs.
II. Wings of birds and wings of insects are modified forelimbs.
III. Wings of birds and wings of insects are analogous organs.
IV. Wings of birds and forelimbs of horse are homologous organs.
The correct statements are
(A) I and II
(B) II and III
(C) III and IV
(D) I and IV
Which of the following pairs of two vegetables represent the correct homologous structures?
(A) Sweet potato and potato
(B) Sweet potato and tomato
(C) Carrot and potato
(D) Radish and carrot
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.
Explain the evolution of giraffe's neck according to Lamarck's theory of evolution.
The organs which perform different functions but have the same basic structure are known as :
(a) homologous organs
(b) analogous organs
(c) homolytic organs
(d) analytic 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.
Identify the following pairs as homologous and analogous organs:
(i) Sweet potato and potato
(ii) Eye of octopus and eye of mammals
(iii) Thorns of Bougainvillaea and tendrils of Cucurbits
(iv) Fore limbs of bat and whale
You have potato, carrot, radish, sweet potato, tomato and ginger bought from the market in your jute bag. Identify two vegetables to represent the correct homologous structures.
(A) Potato and tomato
(B) Carrot and tomato
(C) Potato and sweet potato
(D) Carrot and radish
Write a short note based on the information known to you.
Embryology
Explain any three molecular (genetic) evidences in favour of organic evolution.
Define phylogeny.
Find an odd one out.
Find an odd one out.
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?
Where is carbon dating used?
Define vestigial organs.
Give one example of homologous organs found in plants.
