SSC GD Constable GK Questions 2026

A red blood cell lives about one hundred and twenty days. As it ages its membrane grows stiff, and the narrow winding channels of the spleen trap such cells so that the macrophages lining them can break the cells down and salvage the iron of their haemoglobin.

The heartbeat is not started by a nerve from the brain; the heart generates its own rhythm, and the patch of specialised tissue that does so fastest sets the pace for the rest.

In the ABO system the antigens sit on the surface of the red blood cell and the antibodies float in the plasma.

An artery is defined by direction, not by the kind of blood it holds: it carries blood away from the heart.

The nephron is the structural and functional unit of the kidney, and each human kidney holds about one million of them.

It is a leaf-shaped flap of cartilage at the root of the tongue that swings down and covers the opening of the windpipe every time food is swallowed, so that the bolus is guided into the oesophagus instead of the trachea; when it fails we choke and cough.

Most of the carbon dioxide produced by the tissues enters the red blood cells, where the enzyme carbonic anhydrase combines it with water to form carbonic acid, which at once splits into hydrogen and bicarbonate ions; the bicarbonate then travels in the plasma to the lungs, where the reaction is…

It is a dome-shaped sheet of muscle that separates the chest cavity from the abdomen, and when it contracts it flattens, which increases the volume of the chest, lowers the pressure inside the lungs and draws air in; the intercostal muscles between the ribs assist by lifting the rib cage…

The right lung is divided into three lobes, an upper, a middle and a lower, while the left lung has only two, because the heart is tilted towards the left side of the chest and takes up room there; the left lung even carries a notch called the cardiac notch…

The gastric glands secrete hydrochloric acid, which makes the contents of the stomach strongly acidic; pepsin can work only in such a medium, and the acid also kills most of the bacteria swallowed along with food.

At roughly six to seven metres it is by far the longest part of the nine-metre alimentary canal, it is where digestion is completed by pancreatic and intestinal juices, and its inner wall carries millions of finger-like villi that give a vast surface for absorbing glucose, amino acids, fatty acids…

Bile is made in the liver, stored and concentrated in the gall bladder and poured into the duodenum, and it carries bile salts and bile pigments but not a single digestive enzyme.

It is secreted by the three pairs of salivary glands and breaks starch into the smaller sugar maltose, which is why starch is the only class of food whose digestion actually begins in the buccal cavity.

It is the largest gland as well as the heaviest internal organ of the human body, it lies in the upper right part of the abdomen, and its chief contribution to digestion is bile, which is stored in the gall bladder and emulsifies fat.

Inhalation, also called inspiration, is the phase of breathing in which the diaphragm flattens and the intercostal muscles pull the ribs up and out, so the chest cavity enlarges, the pressure inside the lungs falls below the pressure of the atmosphere and oxygen rich air rushes in through the nostrils…

The works, begun in the time of the Mysore state and later named after Sir M. Visvesvaraya, lies on the Bhadra river and is remembered in geography as the plant that uses electricity generated from water power, along with charcoal from the nearby forests, because the region has no coking…

An agro-based industry uses a farm product as its raw material, and sugar is made from sugarcane, which is why the mills stand in the cane belts of Uttar Pradesh, Maharashtra, Karnataka and Tamil Nadu; cotton textiles, jute, vegetable oil, tea and paper from bagasse belong to the same class.

Because their raw material is light, valuable and easy to move, and because they need little power or water, such units are free of the usual pulls of ore, coal and bulky material; electronics, computer assembly, diamond cutting and software are the standard examples, and they depend mainly on skilled…

The city has a very large number of cotton textile mills and hosiery units, helped by cotton grown nearby, the hydel power of the Western Ghats and a long tradition of engineering workshops that make textile machinery, and so it is called the Manchester of South India, as Ahmedabad is…

Rishra stands on the Hugli near Kolkata, and the mill set up there in 1855 began an industry that is still packed into a narrow belt along that river.