The wings of a bird and that of an insect are:

1. Analogous structures

2. Homologous structure

3. Vestigial structures

4. Useless structures

Subtopic:  Concept of Organic Evolution: Evidence: 2 | Concept of Organic Evolution: Evidence |
 89%
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Directional selection favours:

(1) Both extremes of a trait

(2) Intermediate form of a trait

(3) Environmental differences

(4) One extreme form over the other extreme form and over intermediate forms of the trait

Subtopic:  Natural Selection |
 74%
From NCERT
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Most often the factor that initiates the speciation of two populations is:

(1) Geographic isolation

(2) Inability of the gametes to fuse

(3) Different courtship behaviours

(4) Different copulatory organs

Subtopic:  Concept of Speciation |
 82%
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The oldest fossils resemble:

1. Amoeba

2. Red algae

3. Heterotrophic bacteria

4. Autotrophic bacteria

Subtopic:  Palentological Evidences of Evolution |
 81%
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Reptilian ancestors of the mammals were the :-
1. Therapsids
2. Thecodonts
3. Pterosaurs
4. Plesiosaurs
 

Subtopic:   A BRIEF ACCOUNT OF EVOLUTION |
 76%
From NCERT
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Given below is the representative evolutionary history of vertebrates through geological periods. A, B, C, and D respectively are:

 

A B C D
1. Dinosaurs Thecodonts Therapsids Pelycosaurs
2.  Dinosaurs Therapsids Thecodonts Pelycosaurs
3. Pelycosaurs Therapsids Thecodonts Dinosaurs
4.  Therapsids Dinosaurs Pelycosaurs Thecodonts
Subtopic:  Palentological Evidences of Evolution |
 74%
From NCERT
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Karn & Penrose showed that birth weight follows a normal distribution, that mortality for newborns is greater for those either under-or over-weight, and that the mean birth weight (7 lbs) coincides with that showing minimum mortality. The type of natural selection operating here is shown by the graph :

1. (a)

2. (b)

3. (c)

4. Both (a) and (b)

Subtopic:  Natural Selection |
 59%
From NCERT
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The following two plants exhibit :

1. Analogous organs

2. Vestigial organs

3. Rudimentary organs

4. Homologous organs

Subtopic:  Concept of Organic Evolution: Evidence: 1 | Concept of Organic Evolution: Evidence |
 89%
From NCERT
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In the apparatus of Urey and Miller experiment, the gases [G] contained in the flask are :

 

1. Methane, Carbon dioxide, Ammonia and Water vapour
2. Methane, Hydrogen cyanide, Ammonia and Water vapour
3. Methane, Ammonia, Hydrogen and Water vapour
4. Carbon dioxide, Oxygen, hydrogen and ammonia 

Subtopic:  Urey & Miller Experiment |
 66%
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Lamarck's theory of evolution is also called

1. Theory of special creation

2. Inheritance of acquired characters

3. Survival of the fittest

4. None of these

Subtopic:  Theory of Evolution & Lamarckism |
 87%
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