171: Match List I with List II and select the correct answer using the codes given below the lists :
List I
I. Theory of Mutation
II. Theory of Evolution
III. One gene one enzyme hypothesis
IV. Operon concept
List II
(A) Beadk and Tatum
(B) Jacob and Monod
(C) Darwin
(D) De Vries
Codes:
(a) I-C, II-D, III-A, IV-B
(b) I-D, II-C, III-A, IV-B
(c) I-D, II-C, III-B, IV-A
(d) I-C, II-D, III-B, IV-A
Explanation:
A. Theory of Mutation - Devries
B. Theory of Evolution - Beadle & Tatum
C. One gene one enzyme hypothesis - Darwin
D. Operon concept - Jacob & Monod
172: Three important micronutrients essential for humans are
(a) Copper, zinc and iodine
(b) Zinc, copper and potassium
(c) Nitrogen, molybdenum and iodine
(d) Sulphur, copper and iron
173: When one enters a dark room, he is not able to see anything but after some time his vision improves. This is because:
(a) The retina of the eye comes forward
(b) The retina of the eye moves backward
(c) The pupil of the eye contracts
(d) The pupil of the eye dilates
174: With reference to the use of nano-technology in health sector, which of the following statements is/are correct?
1. Targeted drug delivery is made possible by nanotechnology.
2. Nanotechnology can largely contribute to gene therapy.
Select the correct answer using the code given below.
(a) 1 only
(b) 2 Only
(c) Both 1 and 2
(d) Neither 1 nor 2
175: The difference between a nuclear reactor and an atomic bomb is that
(a) no chain reaction takes place in nuclear reactor while in the atomic bomb there is a chain reaction
(b) the chain reaction in nuclear reactor is controlled
(c) the chain reaction in nuclear reactor is not controlled
(d) no chain reaction takes place in atomic bomb while it takes place in nuclear reactor
Explanation:
A nuclear reactor is constructed to generate electricity in which energy is produced by controlled chain reaction.