Ecosystem

Which of the following is the unit of productivity of an Ecosystem?

1. kcal m-3
2. (kcal m-2) yr-1
3. g m-2
4. kcal m-2

In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100x ( kcal m-2 ) yr-1, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?

1. x10 ( kcal m-2 ) yr-1
2. x ( kcal m-2 ) yr-1
3. 10x ( kcal m-2 ) yr-1
4. 100x3x ( kcal m-2 ) yr-1

Consider the pyramid of energy of an ecosystem given below: [figure] If T4 is equivalent to 1000 J, what is the value at T1 ?

1. 1000010 J
2. 1000010 4 J
3. 10,000 J
4. 10,00,000 J

Which one of the following is not a limitation of ecological pyramids?

1. Saprophytes are not given any place in ecological pyramids
2. It assumes a simple food chain, that almost never exists in nature
3. It accommodates a food web
4. It does not take into account the same species belonging to two or more trophic levels

Identify the correct statements : Choose the correct answer from the options given below :

1. B, C, D only
2. C, D, E only
3. D, E, A only
4. A, B, C only

In the equation GPP - R = NPP GPP is Gross Primary Productivity NPP is Net Primary Productivity R here is .

1. Respiratory quotient
2. Respiratory loss
3. Reproductive allocation
4. Photosynthetically active radiation

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below :

1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct

Which one of the following will accelerate phosphorus cycle?

1. Burning of fossil fuels
2. Volcanic activity
3. Weathering of rocks
4. Rainfall and storms

Detritivores breakdown detritus into smaller particles. This process is called :

1. Catabolism
2. Fragmentation
3. Humification
4. Decomposition

All successions irrespective of the habitat proceed to which type of climax community?

1. Edaphic
2. Xeric
3. Mesic
4. Hydrophytic