All the following are examples of analogous organs except:
1. | Thorn and tendrils of Bougainvillea and Cucurbita |
2. | Sweet potato and Potato |
3. | Flippers of Penguins and Dolphins |
4. | Eye of the Octopus and of Mammals |
Industrial melanism is an example of:
1. | Natural selection | 2. | Mutation |
3. | Racial difference | 4. | Predation |
Stabilizing selection acts to _________ in a species' population.
1. elaborate new traits
2. alter traits
3. push for directional change
4. maintain a certain phenotype
Match each item in Column I with one item in Column II and chose your answer from the codes given below.
Column I |
Column II |
I. Homologous organs II. Analogous organs III. Vestigeal organs |
1. Eye of an octopus and the eye of a mammal 2. Thorn of Bougainvillea and tendril of Cucurbita 3. Body hair and wisdom teeth in humans |
Codes:
I | II | III | |
1. | 1 | 2 | 3 |
2. | 3 | 1 | 2 |
3. | 2 | 1 | 3 |
4. | 1 | 3 | 2 |
For natural selection to bring about evolution, the trait selected by the nature must be:
1. | Dominant | 2. | Recessive |
3. | Mutant | 4. | Inherited |
1. | they all are top predators in a food chain |
2. | they are all herbivores and hence get to feed on large amounts of available primary production |
3. | of lack of competition from any other mammals |
4. | the Australian environment is not conducive for the survival of true placental mammals |
1. | Homology | 2. | Analogy |
3. | Phenotypic plasticity | 4. | Vestigeality |
COLUMN I | COLUMN II | ||
(a) | Adaptive radiation | (i) | Fast emergence of resistance in bacteria against antibiotics |
(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) | Dispersion and diversification of Australian marsupials |
(a) | (b) | (c) | (d) | |
1. | (ii) | (i) | (iv) | (iii) |
2. | (i) | (iv) | (iii) | (ii) |
3. | (iv) | (iii) | (ii) | (i) |
4. | (iii) | (ii) | (i) | (iv) |