Thursday, February 27, 2020

WBCS Polity and Constitution MCQs Prelims and Mains

class 10 biology mcq questions pdf For UPSC | SSC | Rail | RRB | State PSC P35


Biology 35

171. A short day plant has a critical day length of 14 hours. It will flower when the day length is
(A) 12 hours
(B) 16 hours
(C) 15 hours
(D) 18 hours

Correct Answer: [A] 12 hours.
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172. The technique of DNA sequencing was discovered by
(A) Frederick Sanger
(B) E.M. Southern
(C) H.G. Khorana
(D) Watson and Crick

Correct Answer: [A] Frederick Sanger.
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173. Fruit fall can be prevented by spraying
(A) Cytokinins
(B) NAA
(C) IAA
(D) Abscisic acid

Correct Answer: [C] IAA.
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174. Chemically Sporopollenin is a
(A) Protein
(B) Lactic acid
(C) Co-polymer of carotenoids & fatty acid
(D) Carbohydrate

Correct Answer: [C] Co-polymer of carotenoids & fatty acid.
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175. The simple microscope was first invented by
(A) Purkinje
(B) Robert Brown
(C) Robert Hooke
(D) Leeuwenhoek

Correct Answer: [D] Leeuwenhoek.
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