Who proposed the cell theory for plants?

$A$ Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is

Ethanol when reacted with $PCl_5$ gives $A$,$POCl_3$ and $HCl$. $A$ reacts with silver nitrite to form $B$ (major product) and $AgCl$. $A$ and $B$ respectively are

Which of the following national parks is the home of the famous musk deer or Hangul?

Which of the following elements shows polymorphism?

The transformed equation of $x^2+6xy+8y^2=10$ when the axes are rotated through an angle $\frac{\pi}{4}$ is: