516: The crop which is sown with the commencement of Monsoon is:
(a) Rabi Crop
(b) Kharif Crop
(c) Cash Crop
(d) None of these
517: HINDALCO, an aluminium factory located at Renukut owes its site basically to
(a) proximity of raw materials
(b) abundant supply of power
(c) efficient transport network
(d) proximity to the market
518: Why is there a great concern about the microbeads' that are released into environment?
(a) They are considered harmful to marine ecosystems.
(b) They are considered to cause skin cancer in children.
(c) They are small enough to be absorbed by crop plants in irrigated fields.
(d) They are often found to be used as food adulterants.
Explanation:
Microbeads are small, solid, manufactured plastic particles that are less than 5mm and dont degrade or dissolve in water. They may be added to a range of products, including rinse-off cosmetics, personal care and cleaning products. They are considered harmful to marine and aquatic ecosystem.
519: Khetri, Kolar, Sindri and Jharia are associated with:
(a) Copper, gold, fertilisers and coal
(b) Copper, gold, coal and iron
(c) Copper, gold, coal and gypsum
(d) Iron, gold, coal and copper
520: In the context of the organic evolution, the loss of limbs of snakes is explained by the phenomenon of
(a) use and disuse of organs
(b) adaptation to living in burrows
(c) natural selection
(d) inheritance of acquired characters
Explanation:
Loss of limbs of snakes is explained by the phenomenon of use and disuse of organs given by jean Baptist Lamarck popularly called 'Lamarckism'. New organs arise from new needs and develop in the extent that they are used. Disuse of organs leads to their disappearance.