During implantation,the blastocyst becomes embedded in which layer of the uterus?

The Biuret test is not given by:

If the coefficient of $x$ in the expansion of $\left(x^2+\frac{k}{x}\right)^5$ is $270$,then $k$ is equal to

An ideal gas undergoes a thermodynamic cycle as shown in the figure. Which of the following graphs represents the same cycle?

The network shown in the figure is a part of a complete circuit. If at a certain instant the current $i$ is $5\, A$ and is decreasing at the rate of $10^3\, A/s$,then $V_A - V_B$ is......$V$.

If you suspect a major deficiency of antibodies in a person,to which of the following would you look for confirmatory evidence?