Question: The higher concentration of which gas in air can cause stiffness of flower buds ?
$\mathrm{SO}_{2}$
$\mathrm{NO}_{2}$
$\mathrm{CO}_{2}$
$\mathrm{CO}$
Correct Option: 1
Solution:
Due to acid rain in plants high concentration of $\mathrm{SO}_{2}$ makes the flower buds stiff and makes them fall.
