The magnitude of the electrode potential of a metal is a measure of its relative tendency to lose or gain electrons. i.e., it is a measure of the relative tendency to undergo oxidation (loss of electrons) or reduction (gain of electrons).

M → Mⁿ⁺ + ne^– (oxidation potential)

Mⁿ⁺ + ne^– → M (reduction potential)

Hence, the correct option is (C).

Some of the polar crystals when heated produce an electric current. This phenomenon is called Pyro-electricity or pyroelectric effect.

Hence, the correct option is (A).

The IUPAC name of the given compound is 3, 4-dihydroxy-2-methylpentanal.

Aldehyde has a higher priority than alcohol, so the numbering is done as shown in the figure. The longest continuous chain contains 5 carbon atoms and at 3rd and 4th position hydroxy group is present. At 2nd carbon atom, one methyl group is present. Alphabetically 'h' comes first then 'm'.

Hence, the correct option is (B).

According to the question, the magnetic field is uniform and the kinetic energy for each particle is the same.

We know that,

Membranes differ in their protein content. Myelin, a membrane that serves as an insulator around certain nerve fibers, has a low content of protein (18%). Relatively pure lipids are well suited for insulation. In contrast, the plasma membranes or exterior membranes of most other cells are much more active. They contain many pumps, channels, receptors, and enzymes. The protein content of these plasma membranes is typically 50%. Energy-transduction membranes, such as the internal membranes of mitochondria and chloroplasts, have the highest content of protein, typically 75%.

Hence, the correct option is (A).

2,4 ^_ DNPH is used for the test of carbonyl group in laboratory as a red coloured precipitate is formed:

Hence, the correct option is (D).

Order of rate of electrophilic addition reaction with HBr will be (I) > (II) > (III) > IV).

Rate of electrophilic addition with HBr will be determined by carbocation stability :

(I) is most stable because (+) charge is stabilized by resonance from two rings

(II) is stable because (+) charge is stabilized by resonance from ring

(III) is less stable than (II) because although (+) charge is in resonance with ring but another ring which is not in resonance will apply its – I charge,

(IV) (+) charge is in resonance with  but its resonance is not so strong as that of benzene ring

Hence, the correct option is (B).

Monoculture is the agricultural practice of producing or growing a single crop or plant species over a wide area and for a large number of consecutive years. Monocultures can lead to the quicker spread of pests and diseases, where a uniform crop is susceptible to a pathogen. 'Crop monoculture' is the practice of growing the same crop year after year.

Hence, the correct option is (C).