From which plant were haploid plants first obtained through anther culture?

In male cockroaches,sperms are stored in which part of the reproductive system?

In an experiment of a simple pendulum, the errors in the measurement of length of the pendulum $(L)$ and time period $(T)$ are $3 \%$ and $2 \%$, respectively. The maximum percentage error in the value of $\frac{L}{T^2}$ is (in $\%$)

If the direction ratios of two lines are given by $3lm - 4ln + mn = 0$ and $l + 2m + 3n = 0$, then the angle between the lines is:

In the circuit shown in the following figure,the value of $Y$ is

Which alga exhibits a haplo-diplontic life cycle?