The endosperm of gymnosperms is $...$

$A$ homogeneous equation of second degree in $x$ and $y$ represents which of the following?

$A$ body of mass $1\, kg$ is thrown upwards with a velocity $20\, m/s$. It momentarily comes to rest after attaining a height of $18\, m$. How much energy is lost due to air friction? $(g = 10\, m/s^2)$

Which of the following compounds is an optically inactive compound?

If $f: R \rightarrow R$ is an even function which is twice differentiable on $R$ and $f^{\prime \prime}(\pi)=1$,then $f^{\prime \prime}(-\pi)$ is equal to

Serum differs from blood in