A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: A
Solution :
With the aid of electron microscope, ribosomes and several other submicroscopic cell organelles were observed. They are extremely minute in size. For example, the ribosome is a spheroidal particle of 23 nm. The resolving power of electron microscope is 2 ?10 Å and a magnification of 100,000?300,000 can be obtained in an electron microscope.
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