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

Which of the following reacts with benzene in the presence of anhydrous aluminum chloride to form acetophenone?

$A$ piece of copper and another of germanium are cooled from room temperature to $80 \, K$. Which of the following is a correct statement?

What is the science that deals with the study of plants from various perspectives called?

The refractive index of the material of a double convex lens is $1.5$ and its focal length is $5 ~cm$. If the radii of curvature are equal,the value of the radius of curvature (in $cm$) is

Consider two statements $S_1$ and $S_2$. $S_1$: If $f(x)$ is a differentiable function with $f^{\prime}(x) = 0$ in $(a, b)$ and $f(x)$ is increasing in $(a, b)$,then $\frac{f(x)}{f^{\prime}(x)}$ is also increasing in $(a, b)$. $S_2$: Both $\sin x$ and $\tan x$ are increasing functions in $\left(0, \frac{\pi}{2}\right)$. Which of the following is true?