Daily NEET MCQ- March 2, 2022 - NEET MCQ

When a light wave enters from the air medium into the glass medium, the energy of the wave decreases because a part of the light wave is reflected in the air. Therefore, in this way, energy will be affected.

The dehydrogenation of secondary alcohols give ketones. Aldehydes are obtained by the dehydrogenation of primary alcohols.

Lepidopterans are an order of insects consisting of moths and butterflies. Some insects of this order can be killed by the bacteria Bacillus thuringiensis. A few examples of lepidopterans are tobacco budworm, armyworm, bettles, etc.

When a wave undergoes refraction, the phase change will be zero. The phase change is what guides the process. Therefore, no phase change occurs to a wave during refraction.

Oxidation and dehydrogenation of secondary alcohols results in ketones. The same reactions with primary alcohols give aldehydes.

Insect resistance transgenic cotton has been developed by inserting a piece of DNA from a soil bacterium. The bacterium used in this is Agrobacterium tumefaciens. This organism is responsible for causing crown gall disease in an insect.

The activated Bt toxin binds to the midgut epithelial cells. These cells line the inner and outer surface of our bodies such as skin, alimentary canal, urinary tract, and organs.

When a wave is reflected in the rarer medium from the surface of a denser medium, it undergoes a phase change of π radian. Therefore, when a wave undergoes reflection at a denser medium, the phase change will be π radian.

Rosenmund reaction is exclusively used for the preparation of aldehydes by the substitution of chloride by hydrogen. Given this, methanal cannot be formed from this reaction because its corresponding acyl chloride, i.e., formyl chloride, is unstable at room temperature. Benzaldehyde is formed from benzoyl chloride.

 The toxic content of B. thuringiensis consists of protoxins. These protoxins are protein in nature. These are cry proteins that kill the insect by forming crystals in its gut. Protoxins are endotoxins which can be used as biopesticides.