Which of the following group of organisms is not included in the ecological pyramids?

1. Herbivores

2. Carnivores

3. Saprophytes

4. Predators

Subtopic:  Ecological Pyramids |
 91%
From NCERT
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In response to the changing environmental conditions, composition and structure of a community-

1. Remains constant

2. Constantly changes

3. Changes sometime

4. Never changes

Subtopic:  Ecological Succession (OLD NCERT) |
 79%
From NCERT
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What do you mean by ecological succession?

1. One community is succeeded by another

2. One community is dominant over another

3. The gradual and fairly predictable change in the species composition of a given area

4. Success of the ecological community.

Subtopic:  Ecological Succession (OLD NCERT) |
 91%
From NCERT
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During succession some species colonise an area, what does happen to the native species then?

1. Decline and even disappear

2. Flourish equally

3. Migrate

4. Decline in number

Subtopic:  Ecological Succession (OLD NCERT) |
 77%
From NCERT
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Ecological succession occurs-

1. In a species

2. In population

3. In a community

4. All of the above

Subtopic:  Ecological Succession (OLD NCERT) |
From NCERT
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Nature of change in community during succession is –

1. Orderly, sequential and parallel with the changes in the physical environment.

2. Independent of the changes in the physical environment.

3. Constant change

4. Depends upon the community

Subtopic:  Ecological Succession (OLD NCERT) |
 88%
From NCERT
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What do you mean by sere?

1. Series of communities in an area

2. The entire sequence of communities that successively change in a given area

3. The entire sequence of communities.

4. The entire sequence of communities that do not change in a given area.

Subtopic:  Ecological Succession (OLD NCERT) |
 90%
From NCERT
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The individual transitional communities in a sere are termed as-

1. Seral stages

2. Seral communities

3. Seral species

4. Both 1 and 2.

Subtopic:  Ecological Succession (OLD NCERT) |
 65%
From NCERT
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When did ecological succession start on earth?

1. after the rise of mammals

2. since life started

3. after the rise of plants

4. can’t say

Subtopic:  Ecological Succession (OLD NCERT) |
 76%
From NCERT
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Which of the following does not happen during successive seral stages?

1. Change in the diversity of species of organisms

2. Increase in the number of species and organisms

3. A decrease in the total biomass.

4. Change in the properties of soil

Subtopic:  Ecological Succession (OLD NCERT) |
 75%
From NCERT
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