Biology - Section 1 (4)

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Biology - Section 1

25. 

Radioactivity is a phenomenon of the spontaneous emission of
A. protons (alpha particles)
B. electrons (beta particles)
C. gamma rays (short wave electromagnetic waves)
D. All of the above

Answer: Option D

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26. 

Monocot root differs from dicot root in having
A. open vascular bundles
B. scattered vascular bundles
C. well developed pith
D. radially arranged vascular bundles

Answer: Option C

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27. 

Night blindness is cause by lack of which vitamin?
A. Vitamin A
B. Vitamin B
C. Vitamin C
D. Vitamin D

Answer: Option A

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28. 

Norepinephrine increases
A. respiration
B. urine production
C. saliva production
D. blood pressure

Answer: Option D

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29. 

Pigmentation of skin is due to
A. lymphocytes
B. monocytes
C. leucocytes
D. melanocytes

Answer: Option D

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30. 

On which of the following plants did Gregor Mendal perform his classical experiment?
A. Gram
B. Maize
C. Pea
D. Wheat

Answer: Option C

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31. 

Photosynthesis is a process
A. reductive and exergonic
B. reductive and catabolic
C. reductive, endergonic and catabolic
D. reductive, endergonic and anabolic

Answer: Option D

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32. 

Osmosis is the flow of solution from higher concentration to a solution of lower concentration through a semi permeable membrane. What is incorrect in this statement?
A. Exact concentration of solution is not given
B. Character of semi permeable membrane is not given
C. The flow of solution is not possible through semi permeable membrane
D. All are incorrect

Answer: Option C

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