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प्रश्न
Find an odd one out.
विकल्प
Leaf venation
Size of seeds
Leaf petiole
Leaf shape
उत्तर
Size of seeds
APPEARS IN
संबंधित प्रश्न
State the connecting links between Peripatus with Annelida and Arthopoda.
Given below is the list of vegetables available in the market. Select from these the two vegetables having homologous structures:
Potato, sweet potato, ginger, radish, tomato, carrot, okra (Lady’s finger)
(A) Potato and sweet potato
(B) Radish and carrot
(C) Okra and sweet potato
(D) Potato and tomato
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
With the help of any two suitable examples explain the effect of anthropogenic actions on organic evolution.
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
Explain the terms analogous and homologous organs with examples.
Enlist any four sequential evolutionary names of human ancestors.
How do homologous organs help in providing evidence for organic evolution?
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
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.
Write short notes based upon the information known to you.
Connecting link
Explain with suitable examples importance of anatomical evidence in evolution.
_______ is a connecting link between Annelida and Arthropoda.
Explain any three molecular (genetic) evidences in favour of organic evolution.
Define phylogeny.
Answer the following question:
What are homologous structures? Give an example. Is it necessary that homologous structures always have a common ancestor? Justify your answer.
Very short answer question.
What are homologous organs?
The decaying process of C-14 occurs continuously in dead organisms only.
Give scientific reason.
Peripatus is said to be the connecting link between Annelida and Arthropoda.
Write a short note:
Embryological evidences
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.
Biogenetic law states that ______.
Why do all the gametes formed in human females have an X chromosome?
Evolution has exhibited a greater stability of molecular structure when compared with morphological structures. Comment on the statement and justify your opinion.
Cucurbits do not develop thick and woody stem as they are:
Palaeontological evidence for evolution refers to the ______.
Study of fossils is ______.
Which is not a vestigial organ in a man?
Flippers of Penguins and Dolphins are examples of:
Analogous organs arise due to ______.
How do we compute the age of a fossil?
Complete the following chart:
Give a scientific reason.
Morphological evidences suggest that dog, sheep and wolf have a common origin.
What is the function of the appendix of our digestive system?
Write down the difference between homologous and analogous organs.
Define the term:
Homologous organs
Industrial melanism in England after 1850 is an excellent example of Natural selection. Explain how?
