When does the growth rate of a population following the logistic model equal zero? The logistic model is given as dN/dt = rN(1-N/K)

(1) when N nears the carrying capacity of the habitat

(2) when N/K equals zero

(3) when death rate is greater than birth rate

(4) when N/K is exactly one

Subtopic:  Population: Logistic Growth Model |
 60%
NEET - 2016
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Gause's principle of competitive exclusion states that

1. Competition for the same resources excludes species having different food preferences
2. No two species can occupy the same niche indefinitely for the same limiting resources
3. Larger organisms exclude smaller ones through competition
4. More abundant species will exclude the less abundant species through competition
Subtopic:  Population Interactions: Competition |
 67%
From NCERT
NEET - 2016
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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 |
From NCERT
NEET - 2015
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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 |
 89%
From NCERT
NEET - 2015
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Most animals are tree dwellers in a 

1. coniferous forest

2. thorn woodland

3. temperate deciduous forest

4. tropical rainforest

Subtopic:  Introduction to Ecology |
 59%
NEET - 2015
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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


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 |
 89%
NEET - 2015
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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 (OLD NCERT) |
 87%
From NCERT
NEET - 2014
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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. 10         

2. 15           

3. 05           

4. zero

Subtopic:  Population Characters: Density |
 90%
From NCERT
NEET - 2013
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Consider the following four conditions (I-IV) and select the correct pair of them as adaptation 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 (OLD NCERT) |
 78%
From NCERT
NEET - 2011
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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 Dynamic |
 85%
From NCERT
NEET - 2011
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