Triangular age pyramid represents
1. Expanding population.
2. Declining population.
3. Mature population.
4. Both 1. and 3.

Choose the incorrect match regarding population interactions.
                                Species A        Species B
1. Amensalism                –                  –
2. Parasitism                  +                  –
3. Commensalism           +                  0
4. Mutualism                  +                  +

Population density will increase if

1.  Number of births and number of deaths increase.

2.  Number of births and number of immigrants is high.

3.  Number of immigrants and number of deaths is high.

4.  Number of births and number of immigrants is low.

Statement - 1 : Herbivores and plants appears to be more adversely affected by competition than carnivores.
Statement - 2 : Competition is a process in which fitness of one species is significantly lower in the presence of another species.
 

Options
1.  Both statements are correct.

2.  Both statements are incorrect.

3.  1 is incorrect.

4.  2 is incorrect.

“Sexual deceit” is employed by

1. Ophrys to get pollinated.

2. Orchids on mango for shelter.

3. Cuckoo on crow.

4. Abingdon torgoise in Galapagos island.

Which of the following factors increases population density more significantly if new habitat is colonized?

1. Natality 

2. Mortality

3. Immigration 

4. Emigration

The population with the following age pyramid:

1. Will grow exponentially in near future

2. Will grow steadily in the future

3. Is likely to remain stable in future

4. Is likely to decline in future

Consider the following statements:

Which of the above statements are true?

Natality refers to:
1. Death rate
2. Birth rate
3. Number of individuals leaving the habitat
4. Number of individuals entering the habitat