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Q. No.Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?
| 1. | Overproduction, variations, constancy of population size, natural selection |
| 2. | Variations, constancy of population size, overproduction, natural selection |
| 3. | Overproduction, constancy of population size, variations, natural selection |
| 4. | Variations, natural selection, overproduction, constancy of population size |
Select the correct statement from the following:
| 1. | Mutations are random and directional. |
| 2. | Darwinian variations are small and directionless. |
| 3. | Fitness is the end result of the ability to adapt and get selected by nature. |
| 4. | All mammals except whales and camels have seven cervical vertebrae. |
Match List-I with List-II:
| List-I | List-II | ||
| (a) | Adaptive radiation | (i) | Selection of resistant varieties due to excessive use of herbicides and pesticides |
| (b) | Convergent evolution | (ii) | Bones of forelimbs in Man and Whale |
| (c) | Divergent evolution | (iii) | Wings of Butterfly and Bird |
| (d) | Evolution by anthropogenic action | (iv) | Darwin Finches |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (i) | (iv) | (iii) |
| 2. | (i) | (iv) | (iii) | (ii) |
| 3. | (iv) | (iii) | (ii) | (i) |
| 4. | (iii) | (ii) | (i) | (iv) |
Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?
| 1. | Overproduction, variations, constancy of population size, natural selection |
| 2. | Variations, constancy of population size, overproduction, natural selection |
| 3. | Overproduction, constancy of population size, variations, natural selections |
| 4. | Variations, natural selection, overproduction, constancy of population size |
Given below are four statements (A-D) each with one or two blanks. Select the option which correctly fills up the blanks in two statements
Statements:
| (A) | Wings of butterflies and birds look alike and are the results of , evolution |
| (B) | Miller showed that CH4, H2, NH3, and , when exposed to electric discharge in a flask resulted in the formation of . |
| (C) | Vermiform appendix is a organ and an evidence pf evolution. |
| (D) | According to Darwin evolution took place due to and of the fittest. |
Options:
| 1. | (A) - (i) convergent, (B) - (ii) oxygen, (ii) nucleosides |
| 2. | (B) - (i) water vapour, (ii) amino acids, (C) - (i) rudimentary (ii) anatomical |
| 3. | (C) - (i) vestigial, (ii) anatomical, (D) - (i) mutations, (ii) multiplication |
| 4. | (D) - (i) small variations, (ii) survival, (A) - (i) convergent |
Adaptive radiations refers to
1. Power of adaptation in an individual to a variety of environments.
2. Adaptations due to geographical isolation.
3. Evolution of different species from a common ancestor.
4. Migration of members of a species to different geographical areas.
Darwin's in his natural selection Theory did not believe in any role of which one of the following in organic evolution?
1. Parasites and predators as natural enemies
2. Survival of the fittest
3. Struggle for existence
4. Discontinuous variations
Diversification in plant life appeared:
| 1. | Due to abrupt mutations |
| 2. | Suddenly on earth |
| 3. | By seed dispersal |
| 4. | Due to long periods of evolutionary changes |
Select the correct statement from the following:
| 1. | Darwin variations are small and directionless |
| 2. | fitness is the end result of the ability to adapt and gets selected by nature |
| 3. | all mammals except whales and have seven cervical vertebrae |
| 4. | Mutations are random and directional |
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