The logistic population growth is expressed by the equation:

1. dNdt=rNN-KN

2. dtdN=NrK-NK

3. dNdt=rNK-NK

4. dNdt=rN

Subtopic:  Population: Logistic Growth Model |
 82%
From NCERT
AIPMT - 2011
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Which one of the following is most appropriately defined:

1. Amensalism is a relationship in which one species is benefited whereas the other is unaffected
2. Predator is an organism that catches and kills other organism for food.
3. Parasite is an organism which always lives inside the body of another organism and may kill it.
4. Host is an organism which provides food to another organism.
Subtopic:  Population Interactions: Predation |
 68%
From NCERT
AIPMT - 2010
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Cuscuta is an example of:
1.  Brood parasitism
2.  Predation
3.  Endoparasitism
4.  Ectoparasitism

Subtopic:  Population Interactions: Parasitism |
 70%
AIPMT - 2012
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The age pyramid with broad base indicates:
1. high percentage of old individuals
2. low percentage of young individuals
3. a stable population
4. high percentage of young individuals 
Subtopic:  Age Pyramid |
 81%
From NCERT
NEET - 2013
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Which one of the following is not a parasitic adaptation?
1. Development of adhesive organs
2. Loss of digestive organs
3. Loss of reproductive capacity
4. Loss of unnecessary sense organs
Subtopic:  Population Interactions: Parasitism |
 78%
From NCERT
NEET - 2013
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Annual migration does not occur in the case of:

1. Salmons

2. Siberian crane

3. Salamander

4. Arctic tern

Subtopic:  Population Characters: Age Structure & Migration |
 60%
AIPMT - 2006
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Niche overlap indicates:

1. active cooperation between two species
2. two different parasites on the same host
3. sharing of one or more resources between the two species
4. mutualism between two species

Subtopic:  Introduction to Ecology |
 61%
AIPMT - 2006
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The formula for exponential population growth is:

1. dt/dN= rN

2. dN/rN= dt

3. rN/dN= dt

4. dN/dt= rN

Subtopic:  Population: Exponential Growth Model |
 82%
From NCERT
AIPMT - 2006
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Praying mantis is a good example of:

1. Mullerian mimicry

2. Warning colouration

3. Social insects

4. Camouflage

Subtopic:  Population Interactions: Predation |
AIPMT - 2006
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A high density of elephant population in an area can result in:

1. mutualism

2. Intraspecific competition

3. Interspecific completion

4. Predation on one another

Subtopic:  Population Interactions: Competition |
 68%
AIPMT - 2007
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