If more individuals acquire peripheral character value at both the ends of the distribution curve; in such case natural selection has resulted in

(1) Stabilization

(2) Directional

(3) Disruption

(4) May be B or C depending upon population parameters

Subtopic:  Natural Selection |
 84%
From NCERT
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The mechanism of non cellular aggregates of giant macromolecules to cell with membranous envelop is

(1) Natural selection

(2) Not known

(3) Mutation

(4) Recombination

Subtopic:  Origin of Life: Chemical Evolution: 2 | Origin of Life |
 60%
From NCERT
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Which of the following could evolve by the time of 500 mya?

(1) Jawless fishes

(2) Invertebrates

(3) Sea weeds

(4) Lobefins

Subtopic:  Palentological Evidences of Evolution |
 75%
From NCERT
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Bryophytes evolved from

(1) Psilophyton

(2) Rhynia type plants

(3) Tracheophyte ancestors

(4) Chlorophyte ancestors

 59%
From NCERT
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Zosterophyllum evolved from

(1) Psilophyton

(2) Rhynia type plants

(3) Tracheophyte ancestors

(4) Chlorophyte ancestors

 65%
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Which of the following is not on the same lineage?

(1) Herbaceous lycopods

(2) Arborescent lycopods

(3) Zosterophyllum

(4) Sphenopsids

 69%
From NCERT
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Which of the following did not evolve from Psilophyton?

(1) Ferns

(2) Ginkgos

(3) Conifers

(4) Bryophytes

 81%
From NCERT
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The flourishing period of progymnosperm is

(1) Devonian

(2) Silurian

(3) Cretaceous

(4) Permian

Subtopic:  Palentological Evidences of Evolution |
 57%
From NCERT
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The flourishing period of seed ferns is

(1) Jurassic

(2) Devonian

(3) Carboniferous

(4) Triassic

Subtopic:  Palentological Evidences of Evolution |
 59%
From NCERT
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Which of the following was not flourishing in Jurassic period?

(1) Herbaceous lycopods

(2) Sphenopsids

(3) Ferns

(4) Conifers

Subtopic:  Palentological Evidences of Evolution |
 60%
From NCERT
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