## 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

Select the correct statement from the following:

• Darwinian variations are small and directionless

• Fitness is the end result of the ability to adapt and gets selected by nature

• All mammals except whales and camels have seven cervical vertebrae

• Mutations are random and directional

B.

Fitness is the end result of the ability to adapt and gets 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.

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.

262 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

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

A.

N
738 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

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