1. Primary producers
2. Secondary producers
3. Primary consumers
4. Secondary consumers
5. Decomposers
Secondary consumers
1. Producers
2. Consumers
3. Carnivores
4. Decomposers
Decomposers
1. Pyramid of biomass
2. Pyramid of number
3. Pyramid of energy
4. Both (a) and (c)
Pyramid of energy
1. High mountains
2. Sea
3. Rivers
4. Desert
Sea
1. Character displacement
2. Competitive exclusion
3. Primary succession
4. Secondary succession
Primary succession
1. Producers
2. Producers and herbivores
3. Procedures and detritivores
4. Detritivores
Procedures and detritivores
1. Littoral zone
2. Limnetic zone
3. Profundal zone
4. Benthic region
Limnetic zone
1. Nekton
2. Benthos
3. Viruses
4. None of these
Nekton
1. Bidirectional
2. Unidirectional
3. All around
4. None of these
Unidirectional
1. Carnivores
2. Herbivores
3. Decomposers
4. Omnivores
Herbivores