The process of pollination by birds is also known as
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Bubbles of air rise up through liquids due to
In hydel power station, the motion produced in turbines is due to
Which one of the following films was not directed by Satyajit Ray?
Which of the following is a greenhouse gas or a gas which can deplete the ozone layer?
____ is the most electropositive and ___ is the most electronegative element of the third period of modern periodic table.
Presence of large amounts of nutrients in waters also causes excessive growth of _________ algae.
There are ............ metalloids in the modern periodic table.