1571: There is some concern regarding the nanoparticles of some chemical elements that are used by the industry in the manufacture of various products. Why?
1. They can accumulate in the environment, and contaminate water and soil.
2. They can enter the food chains.
3. They can trigger the production of free radicals.
Select the correct answer using the code given below.
(a) 1 and 2 only
(b) 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
1572: The deficiency of Vitamin D causes:
(a) Rickets
(b) Night blindness
(c) Pellagra
(d) Scurvy
1573: 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
1574: There is a concern over the increase in harmful algal blooms in the seawaters of India. What could be the causative factors for this phenomenon?
1. Discharge of nutrients from the estuaries.
2. Run-off from the land during the monsoon.
3. Upwelling in the seas.
Select the Correct answer from the codes given below:
(a) 1 only
(b) 1 and 2 only
(c) 2 and 3 only
(d) 1, 2 and 3
1575: The cellular and molecular control of programmed cell death is known as
(a) Apoptosis
(b) Ageing
(c) Degeneration
(d) Necrosis