What is the optimal soil $pH$ for plant growth?

Ecdysone is produced by

How many $ATP$ molecules are released when one molecule of glucose is oxidized in our liver cells?

The number of angular and radial nodes of $4d$ orbital respectively are

Complete hydrolysis of cellulose yields ........

$A$ closed hollow insulated cylinder is filled with gas at $0^{\circ} C$ and also contains an insulated piston of negligible weight and negligible thickness at the middle point. The gas in one side of the piston is heated to $100^{\circ} C$. If the piston moves $5 ~cm$, the total length of the hollow cylinder is: (in $~cm$)