Daily NEET MCQ- March 26, 2022 - NEET MCQ

The mass of parenchymatous cells are also known as the Nucellus. It maybe massive (crassinucellate ovule) or thin (tenuinucellate ovule). Its surrounded by one or more teguments.

Ategmic means the absence of integuments. Integuments are a natural outer, protective layer. Just like skin in animals, integument in plants is thin and layered.

Passage or pore present at the end of the ovary is called a micropyle. It is a small opening through which water, air, nutrients, etc. go. This pore or passage is left by integuments.

Chalaza is the origin of the integuments or also known as the point where the nucellus attaches itself to the integument. They are usually present on the opposite sides of the ovule (opposite to the micropyle).

When carboxylic acids are heated with alcohols with suitable catalyst, esters are formed. This is a reversible reaction due to all the individual steps involved in the mechanism of this reaction are reversible in nature. It is a type of nucleophilic acyl substitution reaction.

Since the esterification of carboxylic acids is a reversible reaction, it can be shifted towards the right by using excess of alcohol or by the removal the water formed by distillation.

Glottis is a part of respiratory passage and it opens into larynx. Near the glottis is a flap like structure called epiglottis. At the time of swallowing of food this flap covers the glottis to prevent the entry of food particles into it.

In the trachea 16-20 ‘C’ shaped cartilagenous rings are present which prevent the trachea from collapsing. These rings are c shaped in order to allow easy passage of food through oesophagus.

Radial muscles are present in diaphragm. By the contraction in these muscles, diaphragm becomes flattened in shape, so, volume of thoracic cavity increases in anterior posterior axis.

Endoderm is one of the primary germ layers of embryo. It gives rise to epithelium of pharynx including the eustachian tube, the tonsils, the thyroid gland, parathyroid glands, and thymus gland; the larynx, trachea, and lungs; GIT, the urinary bladder, the vagina, and urethra. Alveoli is derived from the endoderm of the embryo.