Ectophloic siphonostele is found in ...........

From which plant are flax fibers obtained?

If $\alpha, \beta, \gamma$ are the roots of $x^3-2x^2+3x-4=0$,then the value of $\alpha^2\beta^2+\beta^2\gamma^2+\gamma^2\alpha^2$ is

Let $n = 1! + 4! + 7! + \ldots + 400!$. Then the ten's digit of $n$ is

If $a, b$ and $c$ form a geometric progression with common ratio $r$,then the sum of the ordinates of the points of intersection of the line $ax + by + c = 0$ and the curve $x + 2y^2 = 0$ is

Which of the following is a natural polymer?