RRB Group D GK Questions 2026

The National Forest Policy of 1952 fixed the goal of keeping about one-third of the total land area of the country under forest, with a larger share in the hills and mountains, where slopes need tree cover to hold the soil, and a smaller share in the plains.

Harry Champion and S. K. Seth revised the earlier survey of Indian forest types in 1968 and grouped the forests into major groups such as moist tropical, dry tropical, montane subtropical, montane temperate, sub-alpine and alpine, each divided further into types, using the climatic controls of rainfall, humidity and temperature.

Mangroves grow in the salty, waterlogged mud of deltas and creeks, where the soil holds almost no oxygen, so the roots send up narrow pegs called pneumatophores above the mud surface to breathe, and many species also stand on arching stilt roots for support in the soft ground.

The sundari, whose botanical name is Heritiera fomes, is the dominant mangrove of the Ganga and Brahmaputra delta and gives the Sundarbans its name; its timber is hard and was long used for boats and posts.

These forests grow where annual rainfall exceeds 200 centimetres, on the windward western slopes of the Western Ghats, in the Andaman and Nicobar Islands, in upper Assam and along the hills of the north-east.

Melocanna baccifera, the muli bamboo, covers large tracts of Mizoram and the neighbouring hills and flowers only once in about half a century, after which the whole stand dies.

Indian forests are classified administratively into reserved, protected and unclassed forests, and the first two together are described as the permanent forest estate, that is land maintained permanently for timber and other forest produce and for the protection of soil and water.

Tropical deciduous forest is called monsoon forest because it is the natural vegetation of the monsoon climate, growing where rainfall lies between 70 and 200 centimetres and where a marked dry season follows the rains.

Red sanders, or red sandalwood, is a tree of the dry deciduous forest and grows almost entirely in the Seshachalam and Palakonda hills of the Eastern Ghats in Andhra Pradesh, where it is prized for its dark red heartwood; it is not a thorn forest species.

Fires are sorted into classes by what is burning, and a fire fed by flammable liquids such as petrol, diesel, kerosene, oil, paint or thinner is a class B fire.

The receptors that pick up taste are called gustatory receptors, and they sit inside the taste buds on the tongue.

In a class 3 lever the fulcrum is at one end, the effort is applied in the middle and the load sits at the far end.

Pitch is how shrill or how flat a sound seems to the ear, and it is decided by frequency, the number of vibrations per second measured in hertz.

The first equation of motion is written as v equals u plus a t, so it tells how the velocity of a body changes with time.

A clinical thermometer is marked from 35 to 42 degrees Celsius, which on the Fahrenheit scale is 94 to 108 degrees.

A shortage of iodine makes the thyroid gland in the neck swell, a condition called goitre. The thyroid needs iodine to make the hormone thyroxine, and when iodine is short the gland grows larger to trap whatever little is available, so the neck looks visibly swollen.

A block lying quietly on a table is in equilibrium, so the forces on it must add up to zero, but that does not mean there are no forces at all.

An echo is the sound heard when a wave is reflected from a distant obstacle and comes back, so in the time measured the sound covers the distance to the cliff and then the same distance back again.

Plant tissues are first divided into meristematic tissue, whose cells keep dividing, and permanent tissue, whose cells have stopped dividing and have taken a fixed shape and job.

The middle ear holds three tiny bones, the smallest in the human body, called the malleus, the incus and the stapes, which in everyday English are the hammer, the anvil and the stirrup.