4386: Consider the following kinds of organisms:
1. Bacteria
2. Fungi
3. Flowering Plants
Some species of which of the above kinds of organisms are employed as biopesticides?
(a) 1 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
4387: Six persons A, B, C, D, E and F are standing in a row. C and D are standing close to each other alongside E. B is standing beside A only. A is fourth from F. Who are standing on the extremes?
(A) A and F
(B) B and F
(C) B and D
(D) None of the above
4388: Gypsum is added to cement clinker to
(a) Increase the tensile strength of the cement
(b) Bind the particles of calcium silicate
(c) Decrease the rate of setting of cement
(d) Facilitate the formation of colloidal gel
4389: Which one of the following pairs is not correctly matched?
(a) William Dickson : Motion Picture film
(b) Charles Babbage : Programmable computer
(c) Nicholas Stern : Construction technology
(d) Brian Greene : String theory
4390: What could be the main reasons for the formation of African and Eurasian desert belt ?
1. It is located in the sub-tropical high pressure cells.
2. It is under the influence of warm ocean currents.
Which of the statements given above is/are correct in this context?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2