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Organisms and Populations

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CBSE Gujarat Board Haryana Board

### Previous Year Papers

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Class 10 Class 12

If the mean and the median pertaining to a certain character of a population are of the same value, which of the following is most likely to occur

• a normal distribution

• a bi-modal distribution

• a T-shaped curve

• a skewed curve

A.

a normal distribution

For a normal distribution the, mean, median and mode are actually equivalent.

For a normal distribution the, mean, median and mode are actually equivalent.

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

D.

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

A.

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

B.

by secretion of pheromones
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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
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