Assertion(A): | Coacervates are believed to be the precursors of life. |
Reason(R): | Coacervates were self-duplicating aggregates of proteins surrounded by lipid molecules. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion(A): | The earliest organisms that appeared on earth were non-green and presumably anaerobes. |
Reason(R): | The first autotrophic organisms were the chemoautotrophs that never released oxygen. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion(A): | Natural selection is the outcome of difference in survival and reproduction among individual that have shown variation in one or more traits. |
Reason(R): | Adaptive forms of a given trait to become more common. Less adaptive ones become less common or disappear. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion(A): | Human ancestors never used their tails so that tail expression gene has disappeared in them. |
Reason(R): | Lamarck's theory of evolution is popularly called theory of continuity of germplasm. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion(A): | Gene flow increases genetic variations. |
Reason(R): | Random introduction of new alleles into recipient population and their removal from donor population affect allele frequency. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion(A): | Among primates, chimpanzee is closest relative to the present day humans. |
Reason(R): | The banding pattern of autosomes 3 and 6 of humans and chimapanzee is remarkably similar. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion(A): | From evolutionary point of view, human gestation period is believed to be shortening. |
Reason(R): | One major evolutionary trend in humans has been the larger head undergoing relatively faster growth in the foetal stage. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion(A): | Fitness is the end result of ability to adapt and get selected by nature. |
Reason(R): | Some organisms are better adapted to survive in an otherwise hostile environment. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion(A): | According to Lamarck the rate and survival of organisms are different due to variations. |
Reason(R): | Lamarck gave the theory of pangenesis. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion(A): | Sickle cell anaemia in malaria endemic area is an example of directional selection. |
Reason(R): | Individuals for sickle cell anaemia have defective gene in X chromosomes. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |