Most animals are tree dwellers in a:

1. coniferous forest
2. thorn woodland
3. temperate deciduous forest
4. tropical rainforest

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? 

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