Certain characteristic demographic features of developing countries are.
1. High fertility, high density, rapidly rising mortality rate and a very young age distribution.
2. High infant mortality, low fertility, uneven population growth and a very young age distribution.
3. High mortality, high density, uneven population growth and a very old age distribution.
4. High fertility, low or rapidly falling mortality rate, rapid population growth and a very young age distribution.

Subtopic:  Age Pyramid |
 73%

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A terrestrial animal must be able to
1. Conserve water.
2. Active pump salts out through the skin.
3. Excrete large amounts of salts in urine.
4. Excrete large amounts of water in urine.

Subtopic:  Introduction to the Chapter |
 72%

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In which one of the following habitats does the diurnal temperature of soil surface vary most?
1. Forest
2. Desert
3. Grassland
4. Shrub land

Subtopic:  Introduction to Ecology |
 71%

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An ecosystem which can be easily damaged but can recover after some time if damaging effects stops will be having
1. High stability and low resilience.
2. Low stability and low resilience.
3. High stability and high resilience.
4. Low stability and high resilience.

Subtopic:  Population Attributes |
 54%

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Animals have the innate ability to escape from predation. Select the incorrect example.
1. Color change in chameleon.
2. Poison fangs in snakes.
3. Melanin in moths.
4. Enlargement of body size by swallowing air in puffer fish.

Subtopic:  Population Interactions: Predation |

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Niche overlap indicates
1. active cooperation between two species.
2. two different parasites on the same host.
3. sharing resources between two species
4. mutualism between two species.

Subtopic:  Adaptations (OLD NCERT) |
 63%

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Annual migration does not occur in the case of
1. Salmon
2. Siberian crane.
3. Salamander.
4. arctic tern.

Subtopic:  Response of Organisms to Abiotic Factors (OLD NCERT) |
 63%

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Exponential population growth is represented by
1. dt/dn=rN
2. dN/rN= dt
3. rN/dN= dt
4. dN/dt = rN

Subtopic:  Population: Exponential Growth Model |
 91%
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Praying mantis is a good example of
1. mullerianmimicary.
2. warning colouration.
3. social insect
4. camouflage.

Subtopic:  Adaptations (OLD NCERT) |
 54%

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The population of an insect species shows an explosive increase in number during rainy season followed by its disappearance at the end of the season. What does this show?

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