The primary producers of the deep-sea hydrothermal vent ecosystem are
1. coral reefs
2. green algae
3. chemosynthetic bacteria
4.blue-green-algae

Which ecosystem has the maximum biomass
1. Forest ecosystem
2. Grassland ecosystem
3. Pond ecosystem
4. Lake ecosystem

Presence of plants arranged into well-defined vertical layers depending on their height can be seen best in

1. Tropical Savannah
2. Tropical Rain Forest
3. Grassland
4. Temperate Forest

Niche is
1. all the biological factors in the organism's environment
2. the functional role played by the organism where it lives
3. the range of temperature that the organism needs to live
4. the physical space where an organism lives

What type of ecological pyramid would be obtained with the following data?
Secondary consumer : 120 g
Primary consumer : 60 g
Primary producer : 10 g
1. Inverted pyramid of biomass
2. Upright pyramid of biomass
3. Upright pyramid of numbers
4. Pyramid of energy

Pneumatophores occur in
1. Halophytes
2. Submerged hydrophytes
3. Carnivorous plants
4. Free-floating hydrophytes

Great Barrier Reef along east coast of Australia is a
1. Population
2. Community
3. Biome
4. Ecosystem

The accompanying figure represents an ecological pyramid. It is

A physical structure that is characteristic of each type of ecosystem is due to:

Stratification of an ecosystem means: