2786: Assertion (A) :
The frequency of floods in North Indian plains has increased during the last couple of decades.
Reason (R) :
There has been reduction in the depth of river valleys due to deposition of silt.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
2787: India is a party to the Ramsar Convention and has declared many areas as Ramsar Sites. Which of the following statements best describes as to how we should maintain these sites in the context of this Convention ?
(a) Keep all the sites completely inaccessible to man so that they will not be exploited
(b) Conserve all the sites through ecosystem approach and permit tourism and recreation only
(c) Conserve all the sites through ecosystem approach for a period without any exploitation, with specific criteria and specific period for each site, and then allow sustainable use of them by future generations.
(d) Conserve all the sites through ecosystem approach and allow their simultaneous sustainable use
2788: The best quality of hard wood for the manufacture of furniture is obtained from
(a) Cedrus deodara
(b) Pinus longifolia
(c) Dalbergia sissio
(d) Mangifera indica
2789: Which one of the following important trade centres of ancient India was on the trade route connecting Kalyana with Vengi ?
(a) Tagara
(b) Sripura
(c) Tripuri
(d) Tamralipti
2790: The trees of spruce, fir, pine, etc. are found in which of the following natural regions of the earth?
(a) Laurentian type
(b) Alpine type
(c) Taiga type
(d) Siberian type