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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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

The table below gives the populations(in thousands) of ten species(A--J) in four areas (a-d) consisting of the number of habitats given within brackets against each. Study the table and answer the question as follows: 
which area out of a to d shows maximum species diversity? 

1. b

2. c

3. a

4. d

Subtopic:  Population Dynamic |
AIPMT - 2008
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The population of an insect species shows an explosive increase in numbers during the rainy season followed by its disappearance at the end of the season. What does this show?

1. S-shaped or sigmoid growth of this insect
2. the food plants mature and die at the end
of the rainy season
3. Its population growth curve is of J-type
4. The population of its predators increases
enormously

Subtopic:  Population: Logistic Growth Model |
 58%
AIPMT - 2007
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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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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur:

1. a normal distribution

2. a bi-modal distribution

3. a T-shaped curve

4. a skewed curve

Subtopic:  Population Dynamic |
AIPMT - 2007
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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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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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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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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

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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NEET 2023 - Target Batch - Aryan Raj Singh
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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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