ï»¿ The population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show? from Biology Organisms and Populations Class 12 Nagaland Board

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The population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show?

• S-shaped or sigmoid growth of this insect

• The food plants mature and die at the endÂ of the rainy season

• Its population growth curve is of J-type

• The population of its predators increasesÂ enormously

C.

Its population growth curve is of J-type

Its population growth curve is J-shaped in which density increases rapidly in exponential fashion and then stops abruptly as environmental resistance or another limiting factor becomes effective more or less suddenly.

Its population growth curve is J-shaped in which density increases rapidly in exponential fashion and then stops abruptly as environmental resistance or another limiting factor becomes effective more or less suddenly.

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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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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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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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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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