The vertical distribution of different species occupying different levels in a biotic community is known as:

1. divergence
2. stratification
3. zonation
4. pyramid

The mass of living material at a tropic level at a particular time is called:

In an ecosystem, the rate of production of organic matter during photosynthesis is termed as:

1. net primary productivity

2. gross primary productivity

3. secondary productivity

4. net productivity

Most animals are tree dwellers in a:

If 20 J of energy is trapped at the producer level, then how much energy will be available to peacocks as food in the following chain? 
Plant → mice → snake → peacock

Which one of the following processes during decomposition is correctly described?

Secondary productivity is the rate of formation of new organic matter by:

1. Parasite

2. Consumer

3. Decomposer

4. Producer

Pheretima and its close relatives derive nourishment from:

1. Sugarcane roots

2. Decaying fallen leaves and soil organic matter

3. Soil insects

4. Small pieces of fresh fallen leaves of maize

Identify the possible link A in the following food chain.
Green plant$\to$Insect$\to$Frog$\to$A$\to$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?