Organisms and Populations

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

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

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