In the case of peppered moth (Biston betularia) the black -coloured form became dominant over the light- coloured form in England during industrial revolution.This is an example of:
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Solution
In the case of peppered moth (Biston betularia) the black coloured form became dominant over the light coloured form in England during industrial revolution. This is an example of natural selection. This group is about species that gain protection from predators due to selection caused by nature.
What is true about the isolated small tribal populations?
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Solution
There is a decline in population as boys marry girls only from their own tribe in the isolated small tribal populations.
A high density of elephant population in an area can result in
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Solution
It is competition between individuals of same species.The intraspecific competition may be very severe because all the members of a species have similar requirements of food, habitat, mate, etc and they also have similar adaptations to get their needs.
Two plants can be conclusively said to belong to the same species if they
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Solution
When the members of a species are inter - fertile and produce fertile off springs.
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?
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Solution
If a population (e.g.reindeer population) is allowed to grow in a predator free environment, the population grows beyond carrying capacity and there occurs population crash due to sudden shortage of food. Such growth curves also occur in insect populations during rainy season, and in algal blooms.
Geometric representation of age structure is a characteristic of
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Solution
Geometric representation of age structure a characteristic of population.
Praying mantis is a good example of
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Solution
Praying mantis is a good example of camouflage.Camouflage is the natural colouring of an animal which enables it to blend in with its surroundings.
The formula for exponential population growth is
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Solution
The formula of exponential growth is dN/dt = rN where dN/dt is the rate of change in population size,r is the biotic potential and N is the population size.
Niche overlap indicates
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Solution
Niche indicate the habitat of a particular species and the interaction of that species with the resources present in the habitat. Niche overlap means that two or more species sharing the resources present in a particular niche.
Which one of the following pairs is mismatched?
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Solution
Prairies is a grassland whereas epiphytes and ephemerals are found in desert. In Tundra much of the ground stays frozen round the year, this condition is called permafrost.The Acacia trees are common in African savannas. In coniferous forest all plants do not shed their leaves at the same time hence forest remain ever green.