Organisms and Populations

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

In which of the following pairs is the specific characteristic of a soil not correctly matched ?

1. Chernozems – Richest soil in the world
2. Laterite – Contains aluminium compound
3. Terra rossa – Most suitable for roses
4. Black soil – Rich in calcium carbonate

In which one of the following habitats does the diurnal temperature of soil surface vary most ?

1. Grassland
2. Desert
3. Shrub land
4. Forest

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. Biotic potential
2. Environmental resistance
3. Morbidity
4. Fecundity

Mycorrhiza is an example of :-

1. Ectoparasitism
2. Decomposers
3. Endoparasitism
4. Symbiotic relationship

The growth curve of bacterial population in lab is plotted against time. What will be the shape of graph?

1. Sigmoid
2. Hyperbolic
3. Ascending straight line
4. Descending straight line

Choose the correct sequence of stages of growth curve for bacteria.

1. Lag, log, stationary, decline phase
2. Lag, log, decline, stationary phase
3. Stationary, lag, log, decline phase
4. Decline, lag, log phase, stationary