1. Digestion is not a function of which of the following ?
[A] Biotin
[B] Pepsin
[C] Renin
[D] None of the above
Show Answer
Correct Answer: A [Biotin]
Notes:
Biotin also called vitamin H, vitamin B₇ or vitamin B₈ is a water-soluble B vitamin. It is also known as vitamin H. Biotin is not a used in the Digestion of food.
2. Which among the following contributes to the replenishment of soil?
[A] Bacteria
[B] Fungi
[C] Algae
[D] Earthworm
Show Answer
Correct Answer: D [Earthworm]
Notes:
Earthworm contributes to the replenishment of soil. As the earthworm moves through the soil, it creates burrows. This allows air and water to move more readily through the soil. The worms also feed on the decaying organic matter, which helps to improve soil fertility.
3. Which among the following is not a function of Sympathetic nerves in Autonomic nervous system?
[A] Enhancing the heart beats
[B] constricting the blood vessels
[C] dilate pupils
[D] contract urinary bladder
Show Answer
Correct Answer: D [contract urinary bladder]
Notes:
contract urinary bladder is a function of Parasympathetic nerves. Sympathetic nerves relax urinary bladder.
4. Who among the following established that genetic code of all organisms is spelled out in three-letter words, each set of three nucleotides codes for a specific amino acid?
[A] Hargobind Khorana
[B] Barbara McClintock
[C] Theodor O. Diener
[D] Joseph L. Goldstein
Show Answer
Correct Answer: A [Hargobind Khorana]
Notes:
Hargobind Khurana’s work on the interpretation of the genetic code and its function in protein synthesis, showing how the order of nucleotides in nucleic acids, which carry the genetic code of the cell, encode the proteins synthesized by the cell . They established the biological language or genetic code common to all living organisms, is spelled out in three-letter words: each set of three nucleotides codes for a specific amino acid.
5. White-nose syndrome (WNS) is an emerging disease among which of the following fauna?
[A] Bats
[B] Snow leopard
[C] Bumblebee
[D] Forest owlet
Show Answer
Correct Answer: A [ Bats]
Notes:
White-nose syndrome (WNS) is an emergent disease of hibernating bats that has spread from the north-eastern to the central United States at an alarming rate.
6. BT Seed is associated with which among the following?
[A] Rice
[B] Wheat
[C] Cotton
[D] Oil Seeds
Show Answer
Correct Answer: C [Cotton]
Notes:
The cotton incorporated the cry1Ac gene from the soil bacterium Bacillus thuringiensis (Bt), making the cotton toxic to bollworms. It is a cheaper alternative to Bt cotton hybrid seed.
7. Which of the following microorganisms causes Ring worm? (UPSC Prelims 1990)
[A] Bacterium
[B] Fungus
[C] Virus
[D] Worm
Show Answer
Correct Answer: B [Fungus]
Notes:
Ringworm isn’t a worm. It’s a skin infection that’s caused by moldlike fungi that live on the dead tissues of your skin, hair, and nails. It can occur at any place and on your scalp. When one gets it between the toes, it’s what people call athlete’s foot.
8. Mitochondrial DNA in an individual comes from which of the following sources? (UPSC Prelims 1991)
[A] Male parent
[B] Female parent
[C] Both parents
[D] Neither of the parents
Show Answer
Correct Answer: C [Both parents]
Notes:
Mitochondrial DNA is the small circular chromosome found inside mitochondria. The mitochondria, and thus mitochondrial DNA, are passed almost exclusively from mother to offspring through the egg cell. Electron microscopy reveals mitochondrial DNA in discrete foci.
9. Which one of the following vitamins is considered to be a hormone? (UPSC Prelims 1994)
[A] A
[B] B
[C] C
[D] D
Show Answer
Correct Answer: D [D]
Notes:
Vitamin D is a hormone the kidneys produce that controls blood calcium concentration and impacts the immune system. It is also known as calcitriol, ergocalciferol, calcidiol and cholecalciferol.
10. What is the name of the vessel that delivers the nutrient rich blood from the stomach and small intestine to the liver? (UPSC Prelims 2006)
[A] Left hepatic artery
[B] Hepatic vein
[C] Right hepatic artery
[D] Hepatic portal vein
Show Answer
Correct Answer: D [Hepatic portal vein]
Notes:
The portal vein or hepatic portal vein is a blood vessel that carries blood from the gastrointestinal tract, gallbladder, pancreas and spleen to the liver. This blood contains nutrients and toxins extracted from digested contents.
