2446: Seven men, A, B, C, D, E, F and G are standing in a queue in that order. Each one is wearing a cap of a different colour like violet, indigo, blue, green, yellow, orange and red. D is able to see in front of him green and blue but not violet. E can see violet and yellow, but not red. G can see caps of all colours other than orange. If E is wearing an indigo coloured cap, then the colour of the cap worn by F is
(a) blue
(b) violet
(c) red
(d) orange
2447: In the Indian context the term De-notified tribes refers to
(a) tribes which are aboriginals
(b) nomadic tribes
(c) tribes practising shifting cultivation
(d) tribes which were earlier classified as criminal tribes
2448: The International Rice Research Institute is located in:
(a) The Philippines
(b) Thailand
(c) Indonesia
(d) Malaysia
2449: With regard to the transmission of the Human Immuno deficiency Virus, which one of the following statements is not correct ?
(a) The chance of transmission from female to male are twice as likely as from male to female
(b) The chances of transmission are more if a person suffers from other sexually transmitted infections
(c) An infected mother can transmit the infection, at childbirth and by breast feeding
(d) The risk of contraction infection from transfusion of infected blood is much higher than an exposure to contaminated needle
2450: With reference to food chains. In ecosystems, consider the following statements:
1. A food chain illustrates the order in which a chain of organisms feed upon each other.
2. Food chains are found within the populations of a species.
3. A food chain illustrates the numbers of each organism which are eaten by others.
Which of the statements given above is/are correct?
(a) 1 only
(b) 1 and 2 only
(c) 1, 2 and 3
(d) None