How many tripeptides can be prepared by linking the amino acids glycine,alanine and phenylalanine?

If the angle between the pair of lines $x^2+2 \sqrt{2} x y+k y^2=0, k>0$ is $45^{\circ}$,then the area (in square units) of the triangle formed by the pair of bisectors of the angles between these lines and the line $x+2 y+1=0$ is

Which of the following tissues is present in the leaves of $Pinus$ and serves to conduct water and food?

Which of the following organisms is not correctly matched with its taxonomic category?

In a $\triangle ABC$,the expression $\frac{\cos C+\cos A}{c+a}+\frac{\cos B}{b}$ is equal to

Under which one of the following conditions do real gases approach the ideal gas behaviour?