Which one of the following is not a functional unit of an ecosystem?
1. Energy flow
2. Decomposition
3. Productivity
4. Stratification
The upright pyramid of number is absent in
1. pond
2. forest
3. lake
4. grassland
Which one of the following statements is correct for secondary succession?
1. It occurs on a deforested site
2. It follows primary succession
3. It is similar to primary succession except that it has a relatively fast pace
4. It begins on a bare rock
Which one of the following statements for pyramid of energy is incorrect, whereas the
remaining three are correct ?
1. It shows energy content of different trophic level organisms
2. It is inverted in shape
3. It is upright in shape
4. Its base is broad
Mass of living matter at a trophic level in an area at any time is called
1. Detritus
2. Humus
3. Standing state
4. Standing crop
Of the total incident solar radiation the proportion of PAR is
1. about 60%
2. less than 50%
3. more than 80%
4. about 70%
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
Which one of the following is one of the characteristics of a biological community ?
1. Stratification
2. Natality
3. Mortality
4. Sex-ratio
The correct sequence of plants in a hyrdosere is
1. Oak→Lantana →Scirpus→Pistia→Hydrilla→Volvax
2. Volvax→Hydrilla→Pistia→Scirpus→Lantana→Oak
3. Pistia→Volvax→Scirpus→Hydrilla→Oak→Lantana
4. Oak →Lantana→Volvax→Hydrilla→Pistia→Scirpus
Which one of the following types of organisms occupy more than one tropic level in a
pond ecosystem?
1. Phytoplankton
2. Fish
3. Zooplankton
4. Frog