Q. No.Biosphere is
| 1. | a component in the ecosystem |
| 2. | composed of the plants present in the soil |
| 3. | life in the outer space |
| 4. | composed of all living organisms present on earth which interact with the physical environment |
Geometric representation of age structure is a characteristic of:
1. Biotic community
2. Population
3. Landscape
4. Ecosystem
1. 10
2. 9
3. 25
4. 15
1. zero
2. 0.1
3. 10
4. 1.0
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 |
What type of human population is represented by the following age pyramid?
1. Stable population
2. Declining population
3. Expanding population
4. Vanishing population
1. high percentage of old individuals
2. low percentage of young individuals
3. a stable population
4. high percentage of young individuals
| 1. | pre-reproductive individuals are more than reproductive individuals. |
| 2. | reproductive individuals are less than post-reproductive individuals. |
| 3. | reproductive and pre-reproductive individuals are equal in number. |
| 4. | pre-reproductive individuals are less than reproductive individuals. |
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
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