Animals devoid of respiratory,excretory,and circulatory organs are:

$\int_0^{\pi / 2} \sin ^8 x \cos ^2 x \, dx$ is equal to

The atomic numbers of Vanadium $(V)$,Chromium $(Cr)$,Manganese $(Mn)$,and Iron $(Fe)$ are $23, 24, 25$,and $26$ respectively. Which of the following has the highest second ionization enthalpy?

$A$ Carnot engine whose low temperature reservoir is at $7^{\circ} C$ has an efficiency of $50 \%$. It is desired to increase the efficiency to $70 \%$. By how many degrees should the temperature of the high temperature reservoir be increased? (in $K$)

Match the terms given in List-$I$ with the suitable option provided in List-$II$,regarding the experiment to calculate the resistance and figure of merit of a galvanometer using the half-deflection method.

List-$I$	List-$II$
$A$. Figure of merit $(k)$	$P$. in series
$B$. Current sensitivity $(S_I)$	$Q$. to get power loss minimized
$C$. Deflection is made half by using resistance	$R$. in shunt/parallel
$D$. High resistance box connected	$S$. current per unit deflection
	$T$. deflection per unit current

The cork cambium, cork, and secondary cortex are collectively called $........$.