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प्रश्न
What are vestigial organs?
What are vestigial organs? Give one example.
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उत्तर १
Vestigial organs are degenerated or underdeveloped organs of organisms which do not perform any function.
उत्तर २
Vestigial organs are structures which have no apparent function in a particular organism. Examples: Tailbone, wisdom teeth
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संबंधित प्रश्न
State a reason for the increased population of dark coloured moths coinciding with the loss of lichens (on tree barks) during industrialization period in England.
Which of the following is a correct set of homologous organs?
(a) Forelimbs of frog, bird and lizard
(b) Spine of cactus and thorn of bougainvillea
(c) Wings of bat and wings of butterfly
(d) Wings of a bird and wings of a bat
Four students P, Q, R and S differently reported the following set of organs to be analogous :
P. Forelimb of a frog and forelimb of a lizard
Q. Forelimb of a bird and forelimb of a human
R. Wings of a parrot and wings of a butterfly
S. Wings of a bird and wings of a bat
The two students who have reported correctly are :
(A) P and Q
(B) Q and R
(C) R and S
(D) P and S
Explain the terms analogous and homologous organs with examples.
Attempt giving a clear definition of the term species.
Explain with an example for the given, how the following provides evidence in favor of evolution in organisms :
Analogous organs
Differentiate between analogous and homologous structures.
Out of bacteria, spider, fish and chimpanzee, which organism has a better body design in evolutionary terms? Give reason for your answer.
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
The presence of which of the following types of organs in two animals indicates that they are not derived from a common ancestor?
(a) homologous organs
(b) excretory organs
(c) analogous organs
(d) reproductive 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.
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?
Select a set of homologous organs from the following:
(A) Wings of a bat and wings of a butterfly
(B) Wings of a pigeon and wings of a bat
(C) Wings of a butterfly and wings of a pigeon
(D) Forelimbs of a duck, forelimbs of a cow and forelimbs of a lizard
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
What do we call the degenerated or partially developed useless organs in living organisms? Enlist such organs in human body? How the same organs are useful in other animals?
Vestigial organ ______ present in human body is proof of evolution.
Write short notes based upon the information known to you.
Connecting link
Explain any three molecular (genetic) evidences in favour of organic evolution.
Define phylogeny.
Very short answer question:
What is vestigeal organ?
Long answer question.
Would you consider wings of butterfly and bat as homologous or analogous and why?
Explain the importance of Anatomical evidences with examples.
Give scientific reason.
Duck-billed platypus shows relationship with mammals.
Enlist the evidences of evolution.
What is carbon dating?
The fossil remains of Archaeopteryx is a connecting link between ______
Where is carbon dating used?
Basic principles of embryonic development were pronounced by:
Which is not a vestigial organ in a man?
Organs having similar functions but different origin and development are known as:
Animal husbandry and plant breeding programmes are the examples of ______.
Did aquatic life forms get fossilised? If, yes where do we come across such fossils?
How do we compute the age of a rock?
I am the connecting link of annelida and arthropoda. What is my name?
Find odd one out:
Write a note on the significance of Palaeontology.
Industrial melanism in England after 1850 is an excellent example of Natural selection. Explain how?
