If the function
$ f(x) = \begin{cases} \frac{\cos ax - \cos 9x}{x^2}, & \text{if } x \neq 0 \\ 16, & \text{if } x = 0 \end{cases} $
is continuous at $ x = 0 $, then $ a = ? $
In Bohr model of hydrogen atom, if the difference between the radii of \( n^{th} \) and\( (n+1)^{th} \)orbits is equal to the radius of the \( (n-1)^{th} \) orbit, then the value of \( n \) is:
Match the following:
Assertion (A): Endosperm is haploid in Gymnosperms Reason (R): Female gametophytic tissue acts as endosperm in Gymnosperms
In the following group of plants, sporophytes are dependent on gametophytes.