Which group includes microorganisms that lack a defined nucleus but contain genetic material (nucleoid)?

Most acidic among the given compounds is:

$\int \frac{dx}{1-\cos x-\sin x}$ is equal to

In the symbiotic association between fungi and plants (mycorrhiza),which nutrient does the fungus absorb from the soil and provide to the plant?

What is the time (in $sec$) required for depositing all the silver present in $125 \ mL$ of $1 \ M \ AgNO_3$ solution by passing a current of $241.25 \ A$? $(1 \ F = 96500 \ C)$

Two non-reactive monoatomic ideal gases have their atomic masses in the ratio $2 : 3$. The ratio of their partial pressures,when enclosed in a vessel kept at a constant temperature,is $4 : 3$. The ratio of their densities is :-