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

1. Ecological niche

2. Biotic community

3. Ecosystem

4. Population

Subtopic:  Introduction to Ecology |
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In which of the following interactions both partners are adversely affected?

1. Competition 

2. Predation

3. Parasitism

4. Mutualism

Subtopic:  Population Interactions: Competition |
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The following graph depicts changes in two populations (A and B) of herbivores in grassy field. A possible reason for these changes is that 

333402
1. both plant populations in this habitat decreased
2. population-B competed more successfully for food than population-A
3. population-A produced more offspring than population-B
4. population-A consumed the members of population-B

 

Subtopic:  Population Interactions: Competition |
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Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to:

1. Western Ghat

2. Meghalaya

3. Corbett National Park

4. Keoladeo National Park

Subtopic:  Response of Organisms to Abiotic Factors |
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A sedentary sea anemone gets attached to the shell lining of a hermit crab. The association is :

1. Symbiosis

2. Commensalism

3. Amensalism

4. Ectoparasitism

Subtopic:  Population Interactions: Commensalism, Protocooperation & Mutualism |
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A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is :

1. 15

2. 05

3. zero

4. 10

Subtopic:  Population Characters: Density |
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According to Darwin, organic evolution is due to:

1. Interspecific competition

2. Competition within closely related species.

3. Reduced feeding efficiency in one species due to the presence of interfering species.

4. Intraspecific competition

Subtopic:  Population Interactions: Competition |
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Cuscuta is an example of :
1.  Brood parasitism
2.  Predation
3.  Endoparasitism
4.  Ectoparasitism

Subtopic:  Population Interactions: Parasitism |
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Consider the following four conditions (I-IV) and select the correct pair of them as adaption to environment in desert lizards. 
The conditions: 
I. Burrowing in soil to escape high temperature 
II. Losing heat rapidly from the body during high temperature 
III. Bask in sun when temperature is low 
IV. Insulating body due to thick fatty dermis

1.  (I) and (III)

2.  (II) and (IV)

3.  (I) and (II)

4.  (III) and (IV)

Subtopic:  Adaptations |
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What type of human population is represented by the following age pyramid? 

 

1.  Stable population

2.  Declining population

3.  Expanding population

4.  Vanishing population

Subtopic:  Population Characters: Age Structure & Migration |
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