766: Sparkling red colour after the blast of fire crackers is due to the presence of:
(a) Strontium
(b) Sodium
(c) Sulphur
(d) Magnesium
767: Why is a plant called Prosopis juliflora often mentioned in news ?
(a) Its extract is widely used in cosmetics.
(b) It tends to reduce the biodiversity in the area in which it grows.
(c) Its extract is used in the synthesis of pesticides.
(d) None of the above
768: In a bisexual flower, if androecium and gynaecium mature at different times, the phenomenon is know as
(a) Dichogamy
(b) Herkogamy
(c) Heterogamy
(d) Monogamy
769: Why does the Government of India promote the use of 'Neem-coated Urea' in agriculture?
(a) Release of Neem oil in the soil increases nitrogen fixation by the soil microorganisms
(b) Neem coating slows down the rate of dissolution of urea in the soil
(c) Nitrous oxide, which is a greenhouse gas, is not at all released into atmosphere by crop fields
(d) It is a combination of a weedicide and a fertilizer for particular crops
770: In which one of the following States are Namchik Namphuk Coalfields located?
(a) Manipur
(b) Mizoram
(c) Meghalaya
(d) Arunachal Pradesh