## Chapter Chosen

Organisms and Populations

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CBSE Gujarat Board Haryana Board

## Previous Year Papers

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Class 10 Class 12

Two plants can be conclusively said to belong to the same species if they

• can reproduce freely with each other and form seeds

• have more than 90 per cent similar genes

• look similar and possess identical secondary metabolites

• have same number of chromosomes

A.

can reproduce freely with each other and form seeds

Fitness (survival of the fittest) is a result of selection and proliferation of only those organisms which were most suitably adapted to the environment and get selected by nature.

Fitness (survival of the fittest) is a result of selection and proliferation of only those organisms which were most suitably adapted to the environment and get selected by nature.

300 Views

Population density is denoted by the symbol
• N
• D
• M
• D

A.

N
738 Views

The departure of a individual from a population is called :
• Natality
• Mortality
• Immigration
• Emigration

D.

Emigration
574 Views

To live in groups is beneficial because :
• feeling of security
• can obtain food easily
• Partner is available for mating
• All the above

D.

All the above
878 Views

Ants give information to their companions :
• by dancing
• by secretion of pheromones
• by making sound
• by defecating

B.

by secretion of pheromones
697 Views

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

:
• Natality
• Mortality
• Migration
• Immigration

A.

Natality
587 Views