11. Camel uses its hump for which of the following purposes? (UPSC Prelims 1993)
[A] Storing water
[B] storing fat
[C] balancing the body during walking in desert sand
[D] temperature regulation
Show Answer
Correct Answer: B [storing fat]
Notes:
A camel’s hump does not hold water at all – it actually stores fat. The camel uses it as nourishment when food is scarce. If a camel uses the fat inside the hump, the hump will become limp and droop down. The hump is not used for water storage, but camels can go for long periods of time without water.
12. Which one of the following genetic diseases is sex-linked? (UPSC Prelims 1999)
[A] Royal haemophilia
[B] Tay-Sachs disease
[C] Cystic fibrosis
[D] Hypertension
Show Answer
Correct Answer: A [Royal haemophilia]
Notes:
Royal haemophilia is sex- linked disease. Clotting of blood is abnormally delayed even small cut will result in non stop bleeding in the affected individual. Queen Victoria was a carrier of this disease and produce haemophilic descendents, so haemophilia is a royal disease.
13. In which of the following Alpha-keratin, a protein is present? (UPSC Prelims 2002)
[A] Blood
[B] skin
[C] wool
[D] eggs
Show Answer
Correct Answer: B [skin]
Notes:
Alpha-keratin, or α-keratin, is a type of keratin found in vertebrates. This protein is the primary component in hairs, horns, mammalian claws, nails and the epidermis layer of the skin. α-keratin is a fibrous structural protein, meaning it is made up of amino acids that form a repeating secondary structure.
14. To which of the following kingdoms does the yeast belong to?
[A] Bacteria
[B] Virus
[C] Fungus
[D] None of the above.
Show Answer
Correct Answer: C [Fungus]
Notes:
Yeast is an unicellular eukaryotic micro organism belonging to the family of fungus.
15. Mammology is the branch of science related to the study of?
[A] mammals
[B] breasts
[C] mollusks
[D] none of these
Show Answer
Correct Answer: A [mammals]
Notes:
Mammology is a branch of biology that deals with the study of mammals.
16. Serology is related to which of the following statements?
[A] Study of dietetics
[B] Study of snakes
[C] Study of serum
[D] Study of seeds
Show Answer
Correct Answer: C [Study of serum]
Notes:
Serology is the study of blood serum (the clear fluid that separates when blood clots).
17. Hugo de Vries is related to which of the following theory of biology?
[A] aquatic ape theory
[B] modern anatomy
[C] Mutation Theory
[D] theory of evolution
Show Answer
Correct Answer: C [Mutation Theory]
Notes:
Hugo de Vries is a Dutch botanist and geneticist who pioneered the experimental study of biological evolution. His rediscovery of Gregor Mendel’s principles of heredity and his theory of biological mutation in 1900.
18. In which group maximum nutritional diversity is found?
[A] Monera
[B] Plantae
[C] Fungi
[D] Animalia
Show Answer
Correct Answer: A [Monera]
Notes:
The state of Monera has the highest nutritional diversity. Photoautotrophic, chemoautotrophic and heterotrophic have all possible types of nutrition
19. The viruses in an attenuated vaccine?
[A] have no genome
[B] continue to replicate
[C] are usually larger than bacteria
[D] is altered with chemicals
Show Answer
Correct Answer: B [continue to replicate]
Notes:
The viruses in an attenuated vaccine continue to replicate. Attenuated vaccines do not usually cause disease like those caused by the wild form of the organism.
20. Which of the following is true about the cell wall of Gram-positive bacteria?
[A] It consists of multiple layers
[B] It is thicker than that associated with gram-negative bacteria
[C] It contains teichoic acids
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
The cell wall of Gram-positive bacteria are: consists of multiple layers, thicker than that associated with gram-negative bacteria and contains teichoic acids.
