Answer
Verified
388.8k+ views
Hint: Natural selection is the process by which an individual or an organism adapts to its environment by bringing about various changes. It is the key mechanism to evolution.
Complete Answer:
We know that Charles Darwin is known as the ‘Father of evolution.’ He had written many books out of which “The origin of species” and “The voyage of Beagle” are few remarkable ones. He also introduced the term “Natural selection” in the year 1859.
Option a: Transgenic animals were created by Rudolf Jaenisch in the year 1974. This has nothing to do with natural selection. Therefore, this is the incorrect option.
Option b: Dolly the sheep was the first mammal to be cloned in the year 1996. This is not related to natural selection. Therefore, this is the incorrect option.
Option c: The theory of natural selection can be explained by prevalence of pesticide resistant insects. This can be explained by the example, in the year 1945 DDT was an effective insecticide against mosquitoes. It was so efficient that it would kill nearly all the mosquitoes, but after 2-4 years of introduction of DDT, it was seen that mosquitoes were not getting killed as effectively as they used to be. This happened because new strains of mosquitoes appeared which were DDT resistant. As these could survive even in the presence of DDT, they soon replaced the DDT sensitive mosquitoes. Therefore, this is the correct option.
Option d: It was in the year 1981, stem cells were discovered. This is not related to natural selection. Therefore, this is the incorrect option.
Thus, the correct option is c) prevalence of pesticide resistant insects.
Note: Another way of looking at this question is that, all the options except option c are man made, thus not naturally existing.
Complete Answer:
We know that Charles Darwin is known as the ‘Father of evolution.’ He had written many books out of which “The origin of species” and “The voyage of Beagle” are few remarkable ones. He also introduced the term “Natural selection” in the year 1859.
Option a: Transgenic animals were created by Rudolf Jaenisch in the year 1974. This has nothing to do with natural selection. Therefore, this is the incorrect option.
Option b: Dolly the sheep was the first mammal to be cloned in the year 1996. This is not related to natural selection. Therefore, this is the incorrect option.
Option c: The theory of natural selection can be explained by prevalence of pesticide resistant insects. This can be explained by the example, in the year 1945 DDT was an effective insecticide against mosquitoes. It was so efficient that it would kill nearly all the mosquitoes, but after 2-4 years of introduction of DDT, it was seen that mosquitoes were not getting killed as effectively as they used to be. This happened because new strains of mosquitoes appeared which were DDT resistant. As these could survive even in the presence of DDT, they soon replaced the DDT sensitive mosquitoes. Therefore, this is the correct option.
Option d: It was in the year 1981, stem cells were discovered. This is not related to natural selection. Therefore, this is the incorrect option.
Thus, the correct option is c) prevalence of pesticide resistant insects.
Note: Another way of looking at this question is that, all the options except option c are man made, thus not naturally existing.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
Using the following information to help you answer class 12 chemistry CBSE
Which of the following would not be a valid reason class 11 biology CBSE
Why should electric field lines never cross each other class 12 physics CBSE
Trending doubts
How do you solve x2 11x + 28 0 using the quadratic class 10 maths CBSE
Which type of bond is stronger ionic or covalent class 12 chemistry CBSE
What organs are located on the left side of your body class 11 biology CBSE
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Difference Between Plant Cell and Animal Cell
How fast is 60 miles per hour in kilometres per ho class 10 maths CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
When people say No pun intended what does that mea class 8 english CBSE