Ecosystem

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

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

Which ecosystem has the maximum biomass ?

1. Pond ecosystem
2. Lake ecosystem
3. Grassland ecosystem
4. Forest ecosystem

Which of the following would appear as the pioneer organisms on bare rocks?

1. Lichens
2. Green algae
3. Liverworts
4. Mosses

Which one of the following is a characteristic feature of cropland ecosystem ?

1. Absence of weeds
2. Absence of soil organisms
3. Ecological succession
4. Least genetic diversity

The term ecosystem was coined by :

1. E.P. Odum
2. E. Haeckel
3. E. Warming
4. A.G. Tansley

The primary producers of the deep-sea hydrothermal vent ecosystem are

1. chemosynthetic bacteria
2. coral reefs
3. green algae
4. blue-green algae

An association of individuals of different species living in the same habitat and having functional interactions is -

1. Ecological niche
2. Ecosystem
3. Population
4. Biotic community

Most animals that live in deep oceanic waters are -

1. primary consumers
2. detritivores
3. tertiary consumers
4. secondary consumers

During ecological succession :

1. the establishment of a new biotic community is very fast in its primary phase.
2. the numbers and types of animals remain constant.
3. the changes lead to a community that is in near equilibrium with the environment and is called pioneer community
4. the gradual and predictable change in species composition occurs in a given area

In which of the following both pairs have correct combination?

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