Daily NEET MCQ- April 24, 2022 - NEET MCQ

Communication is the very act of transmission of information. Irrespective of its nature, every communication system has three essential elements, namely a transmitter, a medium or channel, and a receiver.

The purpose of a transmitter is to convert the message signal produced by the source of information into a suitable form that can be transmitted through the channel that connects the transmitter and the receiver.

The lower aldehydes and ketones are miscible in water in all proportions due to the ability of the polar carbonyl group to form hydrogen bonds with water molecules. However, the solubility rapidly decreases as the length of the alkyl chain increases. Precisely, aldehydes and ketones with more than 4 carbon atoms are practically insoluble in water.

It can be inferred that B has a higher boiling point than A. Since hydrocarbons, ethers and aldehydes have lower boiling points than ketones of similar molecular masses, none of them can be compound A. Also, alcohols have a higher boiling point than similar ketones hence, the compound A is propanol.

Methanal, ethanal and acetone are lower carbonyl compounds and are not much fragrant to be used as flavouring agents.

Directional selection is also known as progressive selection. This selection always operates in a changing environment. After this natural selection, mean value always changed.

The graph given belongs to directional selection as the graph shifts to one direction. The resistance of insects to DDT is an example of directional selection. A single mutation which occurred in a specific gene helped them to breakdown the toxin. It shows that it favored one extreme value.

In disruptive selection, the members of both extreme are selected. The average gets rejected. Most of the individuals get values other than the mean character value. The naturally selected members are shown by two peaks.

In disruptive selection, most of the individuals get the periphery values at both ends of the curve given in the graph. The population gets divided into two different groups. Hence, they have two peaks which resemble a two-humped camel.

Marine mollusca is also known as limpets. They are aquatic snails with a conical shaped shell with a muscular foot. They are members of the family Gastropoda. Their shell pattern shows disruptive selection.