Organisms and Populations

A high density of elephant population in an area can result in :-

1. Mutualism
2. Interspecific competition
3. Predation on one another
4. Intraspecific competition

Annual migration does not occur in the case of

1. Arctic tern
2. salmon
3. Siberian crane
4. salamander

The formula for exponential population growth is-

1. dN/dt = rN
2. dt/dN = rN
3. rN/dN = dt
4. dN/rN = dt

Praying mantis is a good example of-

1. Warning colouration
2. Camouflage
3. Mullerian mimicry
4. Social insects

Niche overlap indicates-

1. Sharing of one or more resources between the two species
2. Mutualism between two species
3. Active cooperation between two species
4. Two different parasites on the same host

More than 70% of world's fresh water is contained in –

1. Polar ice
2. Greenland
3. Antarctica
4. Glaciers and Mountains

At which latitude, heat gain through insolation approximately equals heat loss through terrestrial radiation -

1. 40 North and South
2. 42 12 North and South
3. 66 North and South
4. 22 12 North and South

Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example

1. Poison fangs in snakes
2. Enlargement of body size by swallowing air in puffer fish
3. Colour change in chameleon
4. Melanism in moths

Which one of the following pairs is mismatched ?

1. Tundra - permafrost
2. Savanna - acacia trees
3. Prairie - epiphytes
4. Coniferous forest - evergreen trees

Certain characteristic demographic features of developing countries are -

1. High fertility, low or rapidly falling mortality rate, rapid population growth and a very young age distribution
2. High mortality, high density, uneven population growth and a very old age distribution
3. High fertility, high density, rapidly rising mortality rate and very young age distribution
4. High infant mortality, low fertility, uneven population growth and a very young age distribution