In a haplontic life cycle,how many of the four haploid nuclei degenerate?

For a normal eye,the cornea of the eye provides a converging power of $40 \ D$ and the least converging power of the eye lens behind the cornea is $20 \ D$. Using this information,the distance between the retina and the cornea-eye lens can be estimated to be.......... $cm$.

Which of the following statements is $NOT$ a part of $IPM$ (Integrated Pest Management)?

The following figure shows a logic gate circuit with two inputs $A$ and $B$ and an output $C$. The voltage waveforms of $A$,$B$,and $C$ are as shown in the figure. The logic gate is:

The acceleration due to gravity on the moon is $\left(\frac{1}{6}\right)$ times the acceleration due to gravity on the earth. If the ratio of the density of the earth $\rho_{e}$ to the density of the moon $\rho_{m}$ is $\frac{5}{3}$,then the radius of the moon $R_{m}$ in terms of the radius of the earth $R_{e}$ is: