What is meant by $Tin \ Cry$?

Let $a, b$ and $c$ be three positive real numbers such that the sum of any two of them is greater than the third. All the values of $\lambda$ such that the roots of the equation $x^2+2(a+b+c)x+3\lambda(ab+bc+ca)=0$ are real,are given by

Which of the following does not exist?

The shield-shaped cotyledon seen in monocot seeds is known as:

Two wires of the same material have lengths in the ratio $1:2$ and their radii are in the ratio $1:\sqrt{2}$. If they are stretched by applying equal forces,the increase in their lengths will be in the ratio:

In which of the following arrangements is the order $NOT$ according to the property indicated against it?