# 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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Geometric representation of age structure is a characteristic of:

1. Biotic community

2. Population

3. Landscape

4. Ecosystem

Subtopic:  Population Characters: Age Structure & Migration |
81%
From NCERT
AIPMT - 2007
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A country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations. A and B are twenty years apart. Select the correct interpretation about them:

Interpretations

 1 'A' is more recent and shows a slight reduction in the growth rate 2 'B' is an earlier pyramid and shows stabilised growth rate 3 'B' is more recent showing that the population is very young 4 'A' is the earlier pyramid and no change has occurred in the growth rate

Subtopic:  Population Characters: Density | Population Characters: Age Structure & Migration |
51%
From NCERT
AIPMT - 2009
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Study the four statements (a–d) given below and select the two correct ones out of them:

 a: A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers b: Predator starfish Pisaster helps in maintaining species diversity of some invertebrates c: Predators ultimately lead to the extinction of prey species d: Production of chemicals such as nicotine and strychnine by plants is metabolic disorder

The two correct statements are:
1. a and d
2. a and b
3. b and c
4. c and d

Subtopic:  Population Interactions: Predation |
68%
From NCERT
AIPMT - 2010
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Which one of the following is categorized as a parasite in a true sense?
 1 Human foetus developing inside the uterus draws nourishment from the mother 2 Head louse living on the human scalp as well as laying eggs on human hair 3 The cuckoo (koel) lays its eggs in a crow's nest 4 The female Anopheles bites and sucks blood from humans
Subtopic:  Population Interactions: Parasitism |
69%
From NCERT
AIPMT - 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 Characters: Age Structure & Migration |
84%
From NCERT
AIPMT - 2011
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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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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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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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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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