Tracheids differ from other tracheary elements in

The area of the region bounded by the curve $y=2x-x^2$ and the $X$-axis is

The probability of choosing randomly a number $c$ from the set $\{1, 2, 3, \ldots, 9\}$ such that the quadratic equation $x^2 + 4x + c = 0$ has real roots is

The products formed when heavy water is reacted with magnesium nitride are:

The distance of the point $(1, 1, 9)$ from the point of intersection of the line $\frac{x-3}{1} = \frac{y-4}{2} = \frac{z-5}{2}$ and the plane $x+y+z=17$ is

The major product of the following reaction is