A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is

(1) ectoparasitism

(2) symbiosis

(3) commensalism

(4) amensalism

Subtopic:  Population Interactions: Commensalism, Protocooperation & Mutualism |
NEET - 2013
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Asymptote in a logistic growth curve is obtained, when

(1) The value of 'r' approaches zero

(2) K = N

(3) K > N

(4) K < N

Subtopic:  Population: Logistic Growth Model |
 74%
NEET - 2017
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Mycorrhizae are the example of

(1) fungistasis                 

(2) amensalism

(3) antibiosis                   

(4) mutualism

Subtopic:  Population Interactions: Commensalism, Protocooperation & Mutualism |
 92%
From NCERT
NEET - 2017
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Which of the following is correct for r-selected species?

(1) Large number of progeny with small size

(2) Large number of progeny with large size

(3) Small number of progeny with small size

(4) Small number of progeny with large size

Subtopic:  Life History Variations |
 70%
NEET - 2016
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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 |
 88%
From NCERT
NEET - 2016
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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 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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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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