Ecosystem

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?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

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

1. Net primary productivity
2. Standing state
3. Standing crop
4. Gross primary productivity

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

1. Stratification
2. Pyramid
3. Divergence
4. Zonation

Secondary Succession takes place on/in :

1. Newly created pond
2. Newly cooled lava
3. Bare rock
4. Degraded forest