The term ecosystem was coined by
(1) AG Tansley
(2) E Haeckel
(3) E Warming
(4) EP Odum
In which of the following both pairs have the correct combination?
1. | Gaseous nutrient cycle Sedimentary nutrient cycle |
Carbon and nitrogen Sulphur and phosphorus |
2. | Gaseous nutrient cycle Sedimentary nutrient cycle |
Carbon and sulphur Nitrogen and phosphorus |
3. | Gaseous nutrient cycle Sedimentary nutrient cycle |
Nitrogen and sulphur Carbon and phosphorus |
4. | Gaseous nutrient cycle Sedimentary nutrient cycle |
Sulphur and phosphorus Carbon and nitrogen |
Vertical distribution of different species occupying different levels in a biotic community is
known as
1. divergence
2. stratification
3. zonation
4. pyramid
Secondary succession takes place on/in
(1) bara rock
(2) degraded forest
(3) newly created pond
(4) newly cooled lava
The mass of living material at a tropic level at a particular time is called
1. Gross primary productivity
2. Standing state
3. Net primary productivity
4. standing crop
Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with
four blanks (A-D). Identify the blanks.
A | B | C | D | |
1. | Rock minerals | Detritus | Litterfall | Producers |
2. | Litterfall | Producer | Rock minerals | Detritus |
3. | Detritus | Rock minerals | Producer | Litterfall |
4. | Producer | Litterfall | Rock minerals | Detritus |
Secondary productivity is rate of formation of new organic matter by
1. producer
2. parasite
3. consumer
4. decomposer
Which one of the following is not a gaseous biogeochemical cycle in ecosystem?
1. Oxygen cycle
2. Phosphorus cycle
3. Nitrogen cycle
4. Carbon cycle
Identify the possible link A in the following food chain
Green plant -> Insect -> Frog -> A -> Eagle
1. rabbit
2. wolf
3. cobra
4. parrot
Given below is an imaginary pyramid of numbers. What could be one of the possibilities
about certain organisms at some of the different levels?
1. Level PC is insects and level SC is small insectivorous birds.
2. Level PP is phytoplanktons in sea and whale on top level TC
3. level one PP is pipal trees and the level SC is sheep
4. Level PC is rats and level SC is cats