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.

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 

Which one of the following is not a functional unit of an ecosystem?

1. Energy flow                 

2. Decomposition

3. Productivity                 

4. Stratification