RRB Group D GK Questions 2026

Once fertilisation is complete, the ovary enlarges and ripens into the fruit, and its wall becomes the pericarp that may be fleshy, as in a mango, or dry, as in a pea pod.

Their pollen tube carries two male gametes into the ovule; one fuses with the egg to form the diploid zygote, which is syngamy, and the other fuses with the two polar nuclei to form the triploid primary endosperm nucleus, which is triple fusion.

A stamen is the male reproductive unit of a flower and has just two parts: a stalk called the filament and a swollen head called the anther, in which pollen grains are produced.

The gas is first fixed in the mesophyll cells by the enzyme PEP carboxylase on to a three-carbon acceptor, and the pathway is named after Hatch and Slack.

Here the ATP and NADPH made in the light reaction are spent on fixing carbon dioxide into carbohydrate.

In the light reaction, water absorbed by the roots is split in the presence of light and chlorophyll, a step called photolysis of water or the Hill reaction.

Chlorophyll is built on a ring structure with a single magnesium atom held at its centre, and because magnesium is needed to make the pigment, a plant short of magnesium develops chlorosis, the yellowing of leaves between the veins.

In photosynthesis a green plant absorbs sunlight through chlorophyll and uses that energy to join carbon dioxide and water into carbohydrate.

The correct answer is B, Kamaljit Sandhu, who won the four hundred metres at the Asian Games in Bangkok in 1970 and became the first Indian woman to win an individual gold at those Games.

The correct answer is A, Koneru Humpy, who earned the Grandmaster title in 2002 as a teenager and went on to win the world women's rapid chess championship in 2019.

The correct answer is B, Arati Saha, who crossed the English Channel in 1959 and became the first Asian woman to do so; in 1960 she also became the first Indian sportswoman to be awarded the Padma Shri. Option A is wrong because Bula Choudhury, also a swimmer from Bengal…

The correct answer is B, Saina Nehwal, who won the bronze in the women's singles at the London Olympics in 2012, the first Olympic medal in badminton for India; in 2015 she also became the first Indian woman to reach the world number one ranking in the sport.

She won the world amateur championship in 2002, 2005, 2006, 2008, 2010 and 2018, six titles in all, which earned her the name Magnificent Mary, and she added an Olympic bronze in the fifty-one kilogram class at London in 2012.

The correct answer is C, Sakshi Malik, who won the bronze in the fifty-eight kilogram freestyle category at the Rio de Janeiro Olympics in 2016, coming back from behind in the last seconds of her bout.

Anju Bobby George won the bronze in the long jump at the World Athletics Championships in Paris in 2003, the first medal won by any Indian, man or woman, at those championships.

P. T. Usha finished fourth in that final at Los Angeles in 1984, behind the bronze medallist by one hundredth of a second, the narrowest miss by any Indian athlete at the Olympic Games.

The correct answer is B, Bachendri Pal, who reached the summit on 23 May 1984 with an Indian expedition and was honoured with the Padma Shri and later the Padma Bhushan.

She won the bronze medal in the sixty-nine kilogram class in weightlifting at the Sydney Olympics in 2000, the first Olympic medal by an Indian woman in any sport.

The German meteorologist Alfred Wegener put forward the continental drift theory in 1912, holding that all continents once formed a single supercontinent called Pangaea, surrounded by a single ocean called Panthalassa, which later split into Laurasia in the north and Gondwana in the south.

Its thick ice sheet lifts its average elevation above that of every other continent, and it has no permanent population, only the changing crews of research stations maintained under the Antarctic Treaty system; it is also the coldest, driest and windiest continent and counts as the largest cold desert.