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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Formation of tropical forests needs mean annual temperature and mean annual precipitation as:

1. 18 – 25oC and 150 - 400cm

2. 5 – 15oC and 50 – 100 cm

3. 30 – 50oC and 100 – 150cm

4. 5 – 15oC and 100 – 200 cm

Subtopic:  Introduction to the Chapter |
 76%
From NCERT
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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 |
 57%
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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Zero growth means:

1. natality balance mortality

2. natality is more than mortality

3. natality is less than mortality

4. natality is zero

Subtopic:  Population Characters: Natality & Mortality |
 80%
From NCERT
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Biotic potential or potential natality means:

1. Natural increase of population under ideal/optimum conditions

2. Potential of organisms in a biome

3. Number of organisms in a biome

4. Species of maximum number in a population

Subtopic:  Population Characters: Density |
 72%
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Overlapping region between two ecosystems is called:

1. Biome

2. ecotone

3. Niche

4. Photic zone

Subtopic:  Introduction to Ecology |
 56%
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Benthic organisms are found in:

1. Surface of marine water

2. Middle of water in sea

3. Bottom of sea

4. On-ground

Subtopic:  Abiotic Factors: soil |
 77%
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Predation and parasitism are which type of interactions?

1. (+, +)

2. (+, O)

3. (-, -)

4. (+, -)

Subtopic:  Population Interactions: Predation | Population Interactions: Parasitism |
 89%
From NCERT
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