In plants,what is the function of $CAM$?

Which of the following plants exhibits a haplontic life cycle?

Which of the following reagents reacts with benzaldehyde to produce $1$-phenylethanol?

Let $Q$ be the set of all rational numbers in $[0,1]$ and $f:[0,1] \rightarrow [0,1]$ be defined by $f(x) = \begin{cases} x & \text{for } x \in Q \\ 1-x & \text{for } x \notin Q \end{cases}$. Then,the set $S = \{x \in [0,1] : (f \circ f)(x) = x\}$ is equal to

If the curves $x^2+p y^2=1$ and $q x^2+y^2=1$ are orthogonal to each other,then

$\lim _{x \rightarrow \infty}\left(\frac{x+5}{x+2}\right)^{x+3}$ equals