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Solution - Evolution and Classification - Tracing Evolutionary Relationships

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ConceptEvolution and Classification - Tracing Evolutionary Relationships  

Question

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

Solution

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Explain with an example for each, how the following provides evidences in favour of evolution in organisms:-

(a) Homologous organs (b) Analogous organs (c) Fossils

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 An example of homologous organs is

a) our arm and a dog’s fore-leg.
(b) our teeth and an elephant’s tusks.
(c) potato and runners of grass.
(d) all of the above.

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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

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Can the wing of a butterfly and the wing of a bat be considered homologous organs? Why or why not?

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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

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Solution for concept: Evolution and Classification - Tracing Evolutionary Relationships. For the course 8th-10th CBSE
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