Q. No.Which one of the following is one of the characteristics of a biological community?
1.
Stratification
2.
Natality
3.
Mortality
4.
Sex-ratio
Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?
1. Phytoplankton
2. Fish
3. Zooplankton
4. Frog
1. low moisture content
2. poor nitrogen content
3. anaerobic environment around them
4. low cellulose content
Which of the following ecosystem types has the highest annual net primary productivity?
1. Tropical rainforest
2. Tropical deciduous forest
3. Temperate evergreen forest
4. Temperate deciduous forest
| (A) | removal of 80% of tigers from an area resulted in greatly increased growth of vegetation |
| (B) | removal of most of the carnivores resulted in an increased population of deer |
| (C) | the length of food chains is generally limited to 3-4 trophic levels due to energy |
| (D) | the length of food chains may vary from 2 to 8 trophic levels |
Which two of the above statements are correct?
1. B and C
2. C and D
3. A and D
4. A and B
1. temperate deciduous forests
2. alpine forests
3. scrub forests
4. tropical rain forests
Which one of the following is not used for the construction of ecological pyramids?
| 1. | Dry weight | 2. | Number of individuals |
| 3. | Rate of energy | 4. | Fresh weight |
The biomass available for consumption by the herbivores and the decomposers is called:
1. net primary productivity
2. secondary productivity
3. standing crop
4. gross primary productivity
2. about 50%
3. more than 80%
4. about 70%
| 1. | Detritus | 2. | Humus |
| 3. | Standing state | 4. | Standing crop |
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