Tag: science & technology

The Biological Diversity Act was enacted by the Indian Parliament in 2002 and came into force in 2003. It aims to conserve biological diversity, ensure sustainable use, and fair benefit sharing from biological resources. 1992 (B) is the Rio Convention year, 1997 (C) and 1967 (D) are unrelated.

World AIDS Day has been observed on December 1st every year since 1988. It was the first-ever global health day and is dedicated to raising awareness about the AIDS pandemic caused by HIV infection. The date was chosen to maximize media coverage.

1056 divided by 23 gives 45 remainder 21 (since 23 x 45 = 1035). To reach the next multiple of 23, we need to add (23-21) = 2 more. So 1056 + 2 = 1058, which is divisible by 23 (1058 / 23 = 46).

Let numbers be 13x and 15x. LCM(13x, 15x) = LCM(13,15) x x = 195x = 39780, so x = 204. Numbers are 13x204 = 2652 and 15x204 = 3060. Verification: LCM of 2652 and 3060 is indeed 39780, maintaining the 13:15 ratio.

Oxytocin is the hormone responsible for milk ejection (let-down reflex) during lactation. It causes the muscles around the milk-producing cells to contract, pushing milk into the ducts. Prolactin is responsible for milk production, not ejection. Thyroxine regulates metabolism and testosterone is a male sex hormone.

Kaziranga National Park in Assam is world-renowned for its population of the Indian one-horned rhinoceros. While other sanctuaries like Periyar have diverse wildlife, Kaziranga is specifically famous for having the largest population of this species. The park was established specifically to protect the rhinoceros.

Turner syndrome is characterized by 45 chromosomes with a karyotype of 45,X (22 pairs of autosomes + one X chromosome). The notation XO indicates only one sex chromosome (X) is present instead of the usual two (XX or XY). This occurs due to nondisjunction during gamete formation.

Haemophilia is called the 'royal disease' because it affected many members of European royal families, particularly the descendants of Queen Victoria of Britain. The X-linked recessive bleeding disorder was passed through several royal houses including those of Spain, Germany, and Russia.

Progesterone is a steroid hormone, not a vaccine. Vaccines like polio vaccine, BCG (for tuberculosis), and anti-rabies vaccine are biological preparations that provide immunity. Progesterone is a female sex hormone involved in menstrual cycle and pregnancy.

Hugo de Vries discovered mutation in 1900 through his work on evening primrose plants. While Mendel discovered inheritance laws earlier, mutation as a phenomenon was discovered by de Vries. Morgan later discovered chromosomal inheritance, and Huxley was an evolutionary biologist.