What is the primary objective of crop rotation?

The molar heat capacity of water at constant pressure is $75 \, J \, K^{-1} \, mol^{-1}$. When $1.0 \, kJ$ of heat is supplied to $100 \, g$ of water,which is free to expand,the increase in temperature of water is $...... \, K$.

The technique of obtaining a large number of plantlets by tissue culture method is called:

The bond length of $HCl$ molecule is $1.275 \ \mathring{A}$ and its dipole moment is $1.03 \ D$. The ionic character of the molecule (in percent) (charge of the electron $= 4.8 \times 10^{-10} \ esu$) is

Which of the following is an endothermic reaction?

The circle $4x^2 + 4y^2 - 12x - 12y + 9 = 0$