Two opposite forces operate in the growth and development of every population. One of them relates to the ability to reproduce at a given rate. The force opposing it is called.
1. Morbidity.
2. Fecundity.
3. Biotic potential.
4. Environmental resistance.

The maximum growth rate occurs in
1. Senescent phase.
2. Lag phase.
3. Exponential phase.
4. Stationary phase.

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.

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.

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

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.

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.

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.

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

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