Questions

Ans. E.
In the given sentences, boiled down is the phrasal verb that should have been used which means summarizing something, to reduce or simplify
(something) to the most basic, essential, or fundamental element(s). In this context it means that the one who had more power succeeded. 'Boiled down' should be followed by 'to' and not 'for', hence option D is incorrect.

During respiration, about 97% of oxygen is transported by Red Blood Cells in blood and the remaining 3% gets dissolved in the plasma.Around 20-25% of carbon dioxide is carried by haemoglobin as carbamino-haemoglobin.

Oxygen enters the blood from the lungs and carbon dioxide is expelled out of the blood into the lungs. The blood serves to transport both gases. Oxygen is carried to the cells. Carbon dioxide is carried away from the cells.

All  are  correct  except  D,  as  Jet streams  are  phenomena  of  winter. It   is   believed   that   jet   stream exercises  an  important  influence on the winter weather in India.