11. Haemophilia is a genetic disorder that leads to which of the following conditions? (UPSC Prelims 1998)
[A] Decrease in haemoglobin level
[B] rheumatic heart disease
[C] decrease in WBC
[D] non-clotting of blood
Show Answer
Correct Answer: D [non-clotting of blood]
Notes:
Hemophilia is a mostly inherited genetic disorder that impairs the body’s ability to make blood clots, a process needed to stop bleeding. Rarely a new mutation may occur during early development or haemophilia may develop later in life due to antibodies forming against a clotting factor.
12. Which one among the following is not a good source of nutritional calcium? (UPSC Prelims 2006)
[A] Rice
[B] Ragi
[C] Skimmed milk
[D] Egg
Show Answer
Correct Answer: B [Ragi]
Notes:
Ragi contains only 344 mg of calcium and in 100 gm of ragi protein is 7.3 gm., fat 1.3 gm, fibre 3.6 gms, carbohydrates 72 gms, moisture 13.1 gm.
13. Which vitamin is also called as riboflavin?
[A] Vitamin B1
[B] Vitamin B2
[C] Vitamin B3
[D] Vitamin B6
Show Answer
Correct Answer: B [Vitamin B2]
Notes:
Vitamin B2 is also called as riboflavin. Chemical formula of vitamin B2 is C17H20N4O6.
14. Study of Porifera (sponges) is known as __?
[A] Parazoology
[B] Palaeozoology
[C] Zoophytology
[D] None of these
Show Answer
Correct Answer: A [Parazoology]
Notes:
Parazoology is the branch of zoology that deals with the study of parazoa, primitive multicellular animals that lack true tissues and organs. It encompasses the study of Porifera (sponges), one of the most primitive animal phyla that date back to the Precambian era over 600 million years ago.
15. Which of the following is a sexual spore?
[A] Ascospore
[B] Sporangiospore
[C] Conidia
[D] Zoospore
Show Answer
Correct Answer: A [Ascospore]
Notes:
The ascospore is a spore contained in an ascus; this type of spore is typical of fungi classified as ascomycetes.
16. What is Rancidity?
[A] Deterioration of Fat
[B] Deterioration of Glucose
[C] Deterioration of Protein
[D] Deterioration of Vitamins
Show Answer
Correct Answer: A [Deterioration of Fat]
Notes:
The process of oxidation of oily and Fatty food, which changes its taste and smell is known as Rancidity. Rancidity generally occurs in Fat.
17. Which of the following happens in Gram-positive cells?
[A] second outer membrane that helps to retain the crystal violet stain
[B] multiple layer of peptidoglycan that helps to retain the crystal violet stain
[C] thick capsule that traps the crystal violet stain
[D] periplasmic space that traps the crystal violet
Show Answer
Correct Answer: B [multiple layer of peptidoglycan that helps to retain the crystal violet stain]
Notes:
Multiple layer of peptidoglycan that helps to retain the crystal violet stain is happens in Gram-positive cells. Gram-positive organisms have a thicker peptidoglycan cell wall than Gram-negative bacteria.
18. Which of the following is not an auxiliary pigment?
[A] Chlorophyll ‘a’
[B] Chlorophyll ‘e’
[C] Phycocyanin
[D] Xanthophyll
Show Answer
Correct Answer: A [Chlorophyll ‘a’]
Notes:
Chlorophyll ‘a’ is an essential pigment, it is not helpful.
19. What does it mean for pea grains to be coiled around any support?
[A] Seismonasty
[B] Thigmotaxis
[C] Gravitropism
[D] Thigmotrophism
Show Answer
Correct Answer: D [Thigmotrophism]
Notes:
An example of tropism is thigmotropism, which is a plant’s response to moving toward or away from environmental stimuli.
20. It is a colorless gas that acts as a signal hormone, which of the following is it?
[A] Benzene
[B] Nitric Oxide
[C] Ozone
[D] None of the above
Show Answer
Correct Answer: B [Nitric Oxide]
Notes:
Nitric Oxide is a colorless gas that acts as a signal hormone. Nitric oxide (NO) is a gaseous reactive oxygen species. It has evolved as a signaling hormone in many physiological processes in animals.
