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Q. No.A country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations. A and B are twenty years apart. Select the correct interpretation about them:
Interpretations
| 1. | 'A' is more recent and shows a slight reduction in the growth rate |
| 2. | 'B' is an earlier pyramid and shows stabilised growth rate |
| 3. | 'B' is more recent showing that the population is very young |
| 4. | 'A' is the earlier pyramid and no change has occurred in the growth rate |
A population has more young individuals compared to older individuals. What would be the status of the population after some years?
1. It will decline
2. It will stabilize
3. It will increase
4. It will first decline and then stabilize
Which of the following would necessarily decrease the density of a population in a given habitat?
1. Natality> mortality
2. Immigration> emigration
3. Mortality and emigration
4. Natality and immigration
The impact of immigration on population density is:
| 1. | Negative |
| 2. | Both positive and negative |
| 3. | Neutralized by natality |
| 4. | Positive |
A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is:
1. 15
2. 05
3. zero
4. 10
When the number of:
| 1. | deaths exceeds number of births and also number of emigrants equals number of immigrants |
| 2. | births plus number of immigrants equal number of deaths plus number of emigrants |
| 3. | birth plus number of emigrants is more than the number of deaths plus number of immigrants |
| 4. | birth plus number of immigrants is more than the sum of number of deaths and number of emigrants |
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Q. No.
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