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Explain struggle for existence.
( 5 mark question)
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Answers
Struggle for existence ↓↓↓↓
➡According to the theories of Darwin , individuals multiply in geometric progression.
Example : 2 , 4 , 8 , 10 .....
➡However food multiplies in arithmetic progression .
Example : 2 , 4 , 6 , 8 ........
➡ Space for accommodation of organisms is constant and does not increase .
➡This leads to intense struggle between living organisms for food , shelter, climate , breeding places , food supply and mate .
➡ Intense competition arises and the competition is of different levels such as :
(i) interspecific ( different species ) and
(ii) intraspecific ( same species ) .
➡During this process of struggle for existence , only the strongest individuals who are fit for the environment survive.
➡The ones who are strong is only selected by nature and the rest die . This is called Natural Selection.
➡The process of struggle for existence while facing competitions within or between other species is called Struggle for existence .
Explanation with example :
➡Oysters lay 60 to 80 million eggs every spawn . If all would have survived, then the oysters would have filled up the entire Earth.
➡Same with bacteria and paramecium .
➡Elephants who are the slowest breeder breeds once in 15 years average.
If all survived , the there would have been trillions of elephants up to date.
Thus natural selection and struggle for existence leads to variation and evolution of mankind !
The concept of the struggle for existence concerns the competition or battle for resources needed to live. It can refer to human society, or to organisms in nature. The concept is ancient, and the term struggle for existence was in use by the end of the 18th century.
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