A:
Ginkgo
biloba is living fossil.
R:
Organism which have persisted and remain unchanged for the past several million
years while their relatives disappeared.
In
the following questions a statement of assertion (A) is followed by a statement
of reason (R).
1. If both Assertion & Reason are true and the
reason is the correct explanation of the assertion, then mark (1)
2.
If both Assertion & Reason are true but the reason is not the correct explanation
of the assertion, then mark (2)
3. If Assertion is true statement
but Reason is false, then mark (3)
4. If both Assertion and Reason
are false statements, then mark (4)
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Â Palentological Evidences of Evolution |
 66%
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Hints
A:
Some mutations are spontaneous, others are due to environmental mutagens.
R: Mutations due to replication errors are very rare.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
R: Mutations due to replication errors are very rare.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Â Modern Theory of Evolution |
 64%
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A: Coacervates
are believed to be the precursors of life.
R: Coacervates were self-duplicating aggregates of proteins surrounded by lipid molecules.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
R: Coacervates were self-duplicating aggregates of proteins surrounded by lipid molecules.
In the following questions a statement of assertion (A) is followed by a statement of reason (R).
1. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)
2. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
3. If Assertion is true statement but Reason is false, then mark (3)
4. If both Assertion and Reason are false statements, then mark (4)
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Â Definition & Types of Evolution |Â Cosmic Evolution |
Please attempt this question first.
Hints
Allopatric speciation
A. New species evolve when one (or) more population of a species becomes separated from the other population of the species due to geographical barrier
B. Small groups of individuals break off from the larger group and form a new species
C. Over the time, cessation of the gene flow between geographically isolated population leads to the reproductive isolation
D. The initial stage of allopatric speciation is polymorphism that does not depend on space within a population
E. As a result of natural selection, geographically separate population become adapted to local conditions and thus they are genetically differentiated
Choose the correct answer from the options given below:
1. A and E only
2. A, E, and C only
3. A, B, and D only
4. A , B, C and E
A. New species evolve when one (or) more population of a species becomes separated from the other population of the species due to geographical barrier
B. Small groups of individuals break off from the larger group and form a new species
C. Over the time, cessation of the gene flow between geographically isolated population leads to the reproductive isolation
D. The initial stage of allopatric speciation is polymorphism that does not depend on space within a population
E. As a result of natural selection, geographically separate population become adapted to local conditions and thus they are genetically differentiated
Choose the correct answer from the options given below:
1. A and E only
2. A, E, and C only
3. A, B, and D only
4. A , B, C and E
Subtopic: Â Concept of Speciation |
 53%
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Even harmful mutations do not get eliminated from the gene pool due to
1. Genetic drift
2. Higher frequency due to dominant nature
3. Being recessive and persisting in heterozygous condition
4. Survival value
1. Genetic drift
2. Higher frequency due to dominant nature
3. Being recessive and persisting in heterozygous condition
4. Survival value
Subtopic: Â Hardy Weinberg Law |
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Hints
Given below are two statements
Statement I : In sympatric speciation, gene flow is reduced by polyploidy, sexual selection and habitat differentiation
Statement II: Hybrid zones, which produce offspring of mixed ancestry, are the predicted outcome when species with incomplete reproductive barrier come into contact with one another.
In light of the above statements, choose the most appropriate answer from the options given below
1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct
Statement I : In sympatric speciation, gene flow is reduced by polyploidy, sexual selection and habitat differentiation
Statement II: Hybrid zones, which produce offspring of mixed ancestry, are the predicted outcome when species with incomplete reproductive barrier come into contact with one another.
In light of the above statements, choose the most appropriate answer from the options given below
1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct
Subtopic: Â Concept of Speciation |
 61%
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Hints
What will happen to the population of two forms of Biston betularia (peppered moth) inhabiting the region polluted due to emission of soot from industries?
A. Population of dark colored moth will increase
B. Population of both the forms will decrease
C. Population of light colored moth will increase
D. Population of dark colored moth will increase while the population of light colored moth will decrease
E. Population of both the forms will increase
Choose the correct answer from the options given below:
1. A and D only
2. C, D, and E only
3. C and D only
4. B, C, and D only
A. Population of dark colored moth will increase
B. Population of both the forms will decrease
C. Population of light colored moth will increase
D. Population of dark colored moth will increase while the population of light colored moth will decrease
E. Population of both the forms will increase
Choose the correct answer from the options given below:
1. A and D only
2. C, D, and E only
3. C and D only
4. B, C, and D only
Subtopic: Â Natural Selection |
 91%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
Genetic drift operates in
1. Small isolated population
2. Fast reproductive population
3. Large isolated population
4. Slow reproductive population
1. Small isolated population
2. Fast reproductive population
3. Large isolated population
4. Slow reproductive population
Subtopic: Â Difference Between Drift & Selection |
 83%
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At a particular locus, frequency of "A" allele is 0.6 and that of "a" is 0.4. What would be the frequency of heterozygotes in a random mating population at equilibrium?
1. 0.36
2. 0.16
3. 0.24
4. 0.48
1. 0.36
2. 0.16
3. 0.24
4. 0.48
Subtopic: Â Hardy Weinberg Law |
 80%
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The eye of octopus and eye of dog show different structural patterns, yet they perform similar functions. This is an example of
1. Analogous organs that have evolved due to divergent evolution
2. Homologous organs that have evolved due to convergent evolution
3. Homologous organs that have evolved due to adaptive radiation
4. Analogous organs that have evolved due to convergent evolution
1. Analogous organs that have evolved due to divergent evolution
2. Homologous organs that have evolved due to convergent evolution
3. Homologous organs that have evolved due to adaptive radiation
4. Analogous organs that have evolved due to convergent evolution
Subtopic: Â Concept of Organic Evolution: Evidence |
 89%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
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