1646: Among living organisms, which one of the following is the most responsible factor for bringing about the origin of a new species?
(a) Isolation
(b) Mutation
(c) Natural Selection
(d) Sexual Reproduction
1647: Which one of the following pairs of metals constitutes the lightest metal and the heaviest metal, respectively?
(a) Lithium and mercury
(b) Lithium and osmium
(c) Aluminium and osmium
(d) Aluminium and mercury
1648: Other than resistance to pests, what are the prospects for which genetically engineered plants have been created?
1. To enable them to withstand drought
2. To increase the nutritive value of the produce
3. To enable them to grow and do photosynthesis in spaceships and space stations
4. To increase their shelf life
Select the correct answer using the codes given below :
(a) 1 and 2 only
(b) 3 and 4 only
(c) 1, 2 and 4 only
(d) 1, 2, 3 and 4
1649: What does venture capital mean?
(a) A short-term capital provided to industries
(b) A long-term start-up capital provided to new entrepreneurs
(c) Funds provided to industries at times of incurring losses
(d) Funds provided for replacement and renovation of industries.
1650: The January isotherm taken as a basis for dividing India into tropical and sub-tropical zones is
(a) 21°C
(b) 18°C
(c) 12°C
(d) 15°C