TextBook Solutions for Himachal Pradesh Board of School Education Class 12 Biology Chapter 13 Organisms And Populations

• feeling of security
• can obtain food easily
• Partner is available for mating
• All the above

• by dancing
• by secretion of pheromones
• by making sound
• by defecating

• N
• D
• M
• D

The number of births during a given period in the
population that are added to the initial density is 

• Natality
• Mortality
• Migration
• Immigration

• Natality 
• Mortality
• Immigration 
• Emigration

• Parasitism
• Predation
• Both (A) and (B)
• commenalism

• Competition
• Mutualism
• Commensalism
• Amensalism

• Competition
• Mutualism
• Parasitism
• Commensalism

1. The optimal capacity of the organism to produce offspring is called........................

2. Rapid increase in human population is called........................

3. Mathematical expression of the growth of population is called........................

4. Yeast cells grown in a culture medium show........................growth curve.

5. Main cause of population explosion is........................

A.

B.

C.

D.

E.