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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People who have migrated from the planes to an area adjoining Rohtang Pass about six months back:

1. Have more RBCs and their haemoglobin has a lower binding affinity to 02
2. Are not physically fit to play games like football
3. Suffer from altitude sickness with symptoms like nausea, fatigue, etc.
4. have the usual RBC count but their haemoglobin has a very binding affinity to 02

Subtopic:  Adaptations (OLD NCERT) |
 68%
From NCERT
AIPMT - 2012
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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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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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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 |
 67%
From NCERT
AIPMT - 2010
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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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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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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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