The mond's process is used for refining of nickel as per following reaction.

Hence, the correct option is (B).

Stabilizing selection is a type of natural selection that favors the average individuals in a population. This process selects against the extreme phenotypes and instead favors the majority of the population that is well adapted to the environment. Stabilizing selection is often shown on a graph as a modified bell curve that is narrower and taller than the norm.

Hence, the correct option is (A).

Ethyl alcohol, 2-alkanols and carbonyl compounds containing  group show iodoform test, i.e., acetaldehyde and 2-ketones etc. So iodoform test is not given by 3-pentanone.

Hence, the correct option is (D).

Ancyclostoma (hook worm) is a parasitic nematode. Nematodes are characterized by pseudocoelomate. Pseudocoelom means false body cavity. These animals cavity between the germ layers (mesoderm) and the gut.

Hence, the correct option is (D)

The oesophagus of the cockroach opens up into a sac like structure called the crop.

The crop is followed by the gizzard or proventriculus. Gizzard is thick walled, muscular and conical bulbous structure. It has an outer thick layer of circular muscles and a thick, inner cuticle forming six highly chitinous plates called teeth.

Hence, the correct option is (C).

Apospory is defined as the development of the gametophyte from the sporophyte without the formation of spores. The spore mother cell does not undergo meiosis. It is otherwise defined as the development of an embryo of a flowering plant outside the embryo sac, from a cell of the nucellus or chalaza. 

Hence, the correct option is (A).

Let power of lens = P_L

Power of mirror = P_M

In case of silvering plane surface, refraction will take place through curve part twice, and reflection will take place through plane part once.

In case of silvering convex surface, refraction will take place via the plane part twice and reflection will take place through curve part once.

P_L= 0 here as plane part won't refract like a lens.

Hence, the correct option is (C).

Longitudinal waves involve changes in the volume and density of the medium. Since all media can sustain compressive stress, longitudinal waves can be transmitted through all three types of media.

Hence, the correct option is (D).

Intermediate product of hydrolysis of cyanide is RCONH₂ as shown in below given reaction:

Hence, the correct option is (B).