You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?

The minimum value of $2x^2+x-1$ is:

Modern cereal $Triticale$ is developed by crossing between

$A$ large open tank has two holes in the wall. One is a square hole of side $L$ at a depth $y$ from the top and the other is a circular hole of radius $R$ at a depth $4y$ from the top. When the tank is completely filled with water,the quantities of water flowing out per second from both holes are the same. Then,$R$ is equal to

The differential equation of the family of parabolas with focus at the origin and the $x$-axis as axis is

Excretory organs in $Taenia$ are