Daily NEET MCQ- April 18, 2022 - NEET MCQ

Mirage is an optical illusion observed in deserts or over hot extended surfaces like a coal-tarred road, due to which a traveler sees a shimmering pond of water some distance ahead of him and in which the surrounding objects like trees appear inverted.

The faces of a diamond are cut suitably so that light entering it suffers total internal reflections repeatedly and gets collected inside but it comes out through only a few faces. Diamond sparkles when seen in the direction of emerging light.

A primary cell is one in which the electrode reactions occur only once and cannot be reversed by applying electrical energy. Therefore, primary cells cannot be recharged. A mercury cell is an example of a primary cell, whereas a nickel-cadmium storage cell is an example of a secondary cell.

A dry cell is constructed using zinc and graphite. It consists of a zinc cylinder through whose centre passes a graphite rod. The zinc cylinder acts as an anode, whereas the graphite rod acts as a cathode.

In a dry cell, zinc loses electrons and the zinc ions dissolve into the electrolyte. As a result, the zinc cylinder of the dry cell develops holes as it is used. To prevent the leakage of electrolyte through these holes, an iron or steel sheet is used to cover the cylinder.

Fungi produce various kinds of thick-walled spores that help to survive unfavorable conditions and germinate on the availability of a suitable environment. Along with these such spores are also produced by bacteria, lower plants, and algae.

Seeds in higher plants serve as a means to tide over a period of stress and also helping in dispersal. A seed is an embryonic plant, a viable offspring that is enclosed in the protective outer covering.

The zooplankton species in lakes and ponds enter diapause stage under unfavorable conditions. Diapause is a stage of suspended development. It is like hibernation in higher animals except it is used to avoid hot, dry summers in tropical areas.

Migration is the movement of organisms from one geographical location to another. It can be temporary or permanent. The annual migration is a yearly cycle. Among the above-given options, the annual migration is not seen in salamanders.

Hibernation is a stage of suspended development seen in higher organisms. It occurs in winters. It is mostly seen in endotherms in which all the metabolic activities are slowed down. It is a periodic cycle.