Advertisements
Advertisements
प्रश्न
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?
Advertisements
उत्तर
- Degenerated or partially developed useless organs are called vestigial organs.
- Wisdom tooth, Appendix, Body hairs, Coccyx, are some vestigial organs in human body.
- Coccyx supports the tail in other animals. Body hairs protect from cold.
APPEARS IN
संबंधित प्रश्न
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.
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
Write the similarity between the wing of a butterfly and the wing of a bat. What do you infer from the above with reference to evolution?
How analogy and homology considered as an evidence in support of evolution ?
An example of homologous organs is
Attempt giving a clear definition of the term species.
Name the scientists who Discovered the fossil of Australopithecus
Name any two temporary embryonic structures in vertebrates which provide evidence for evolution.
Name two animals having homologous organs and two having analogous organs. Name these organs.
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 organs which perform similar functions but have different basic structure are called :
(a) asymmetric organs
(b) analogous organs
(c) homologous organs
(d) homophonic organs
One pair of organs in the following animals are not homologous. This is :
(a) forelimbs in humans and lizard
(b) forelimbs in lizard and frog
(c) wings in butterfly and bat
(d) wings in bat and bird
The organs P and Q of two animals have different structures but similar functions. On the other hand, the two organs R and S of two other animals have the same basic structure but different functions.
(a) What are the organs like P and Q known as?
(b) Name the organs like P and Q. Also name the animals which have such organs.
(c) What are the organs like R and S called?
(d) Name the organs like R and S. Also name the animals which have such organs.
In a class, students were asked to observe the models/slides/pictures of the skeletons of forelimbs and wings of different organisms. After the observations the students made the following groups of homologous structures. Select the correct group :
(A) Wings of a bird and a butterfly
(B) Wings of a pigeon and a bat
(C) Wings of a butterfly and a bat
(D) Forelimbs of a cow, a duck and a lizard
Complete the following chart:
“Appearance of melanised moths post-industrialisation in England is a classic example of evolution by natural selection.” Explain.
What do you mean by vestigial structures? Name four vestigial organs found in man.
Differentiate between connecting links and the missing links.
Short answer question.
Give the significance of fossils.
Find an odd one out.
Match the following.
| Column A | Column B |
| 1) Morphological evidences | a) Tail-bone or wisdom teeth |
| 2) Paleontological evidences | b) Leaf venation |
| c) Fossils |
Give scientific reason.
Peripatus is said to be the connecting link between Annelida and Arthropoda.
Write a short note:
Embryological evidences
Complete the flowchart.
Define the evidence of evolution shown in the figure.
Biogenetic law states that ______.
How do you differentiate homologous organs from analogous organs?
Select vestigial organs from the following.
Select the correct statement.
Define vestigial organs.
Why do all the gametes formed in human females have an X chromosome?
Organs having similar functions but different origin and development are known as:
The bones of forelimbs of whale, bat, cheetah and man are similar in structure, because ______.
Give an example for convergent evolution and identify the features towards which they are converging.
How do we compute the age of a rock?
Industrial melanism in England after 1850 is an excellent example of Natural selection. Explain how?
Define Palaeontology.
