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प्रश्न
Write a short note based on the information known to you.
Embryology
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उत्तर
- Embryology is the study of the formation and development of the embryo and fetus.
- Embryology is used as one of the pieces of evidence of evolution.
- Comparative studies of embryos in vertebrates show that there is considerable similarity at the initial stages, but this similarity gradually decreases.
- This similarity in embryonic development reflects the common origin of organisms.
APPEARS IN
संबंधित प्रश्न
Explain with an example for the given, how the following provides evidence in favor of evolution in organisms:
Homologous organs
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?
Differentiate between analogy and homology giving one example each of plant and animal respectively.
Four students A, B, C and D reported the following set of organs to be homologous. Who is correct ?
(A) Wings of a bat and a butterfly
(B) Wings of a pigeon and a bat
(C) Wings of a pigeon and a butterfly
(D) Forelimbs of cow, a duck and a lizard
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 evolution of giraffe's neck according to Lamarck's theory of evolution.
What are homologous organs?
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.
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?
Define fossil.
Differentiate between connecting links and the missing links.
______ is a vestigial organ in human beings.
Complete the flowchart.
Enlist the evidences of evolution.
The fossil remains of Archaeopteryx is a connecting link between ______
Define vestigial organs.
Why do all the gametes formed in human females have an X chromosome?
Give an example for convergent evolution and identify the features towards which they are converging.
As shown in figure below some organisms that share a common ancestor have features that have different functions, but similar structures.
These are known as ______. Give example.
