286: In India, cluster bean (Guar) is traditionally used as a vegetable or animal feed, but recently the cultivation of this has assumed significance.
Which one of the following statements is correct in this context ?
(a) The oil extracted from seeds is used in the manufacture of biodegradable plastics
(b) The gun made from its seeds is used in the extraction of shale gas
(c) The leaf extract of this plant has the properties of anti-histamines
(d) It is a source of high quality biodiesel
287: Mixed farming means:
(a) Simultaneous cultivation of a number of crops in a single field
(b) Alternate cropping in a field
(c) Growing fruits and vegetables in the same field
(d) None of these
288: Which of the following can be found as pollutants in the drinking water in some parts of India?
1. Arsenic
2. Sorbitol
3. Fluoride
4. Formaldehyde
5. Uranium
Select the correct answer using the codes given below.
(a) 1 and 3 only
(b) 1, 3 and 5 only
(c) 2, 4 and 5 only
(d) 1, 2, 3, 4 and 5
289: A person travelled a distance of 50 km in 8 hours. He covered a part of the distance on foot at the rate of 4 km per hour and a part on a bicycle at the rate of 10 km per hour. How much distance did he travel on foot?
(A) 20 km
(B) 10 km
(C) 40 km
(D) 30 km
290: Assertion (A) :
The southern half of India lies within the tropics and the northern half belongs to the warm temperate zone
Reason (R) :
The tropic of cancer runs almost halfway through India
(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