If '+' sign is assigned to beneficial interaction, '-' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by'+''-' refers to:

1. mutualism

2. amensalism

3. commensalism

4. parasitism

Subtopic:  Population Interactions: Parasitism |
 89%
From NCERT
NEET - 2016
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Which one of the following population interactions is widely used in medical science for the production of antibiotics ?

1. Commensalism
2. Mutualism
3. Parasitism
4. Amensalism

Subtopic:  Population Interactions: Amensalism |
 61%
NEET - 2018
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The principle of competitive exclusion was stated by?

1. C. Darwin

2. G. F. Gause

3. MacArthur

4. Verhulst and Pearl

Subtopic:  Population Interactions: Competition |
 81%
From NCERT
NEET - 2016
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Mycorrhizae are the example of:

1. Amensalism

2. Antibiosis

3. Mutualism

4. Fungistasis

Subtopic:  Population Interactions: Commensalism, Protocooperation & Mutualism |
 91%
From NCERT
NEET - 2017
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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 the death rate is greater than the birth rate
4. when N/K is exactly one
Subtopic:  Population: Logistic Growth Model |
 69%
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 known as:

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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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 |
 92%
From NCERT
AIPMT - 2013
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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 |
 67%
From NCERT
AIPMT - 2013
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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 |
 84%
From NCERT
AIPMT - 2011
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