11. Which of the following branches of Biology is not associated with snakes ?
[A] Herpetology
[B] Ophiology
[C] Serpentology
[D] Saurology
Show Answer
Correct Answer: D [Saurology]
Notes:
All of the three –Herpetology, Ophiology and Serpentology are associated to the study of snakes.While Saurology is associated to the study of Lizards. Thus Option [D] is correct.
12. Which of the following is the reason behind bleeding through nose in high mountain regions? (UPSC Prelims 1979).
[A] The pressure of the blood capillaries is higher than the outside pressure
[B] The pressure at high altitudes is greater than that in the plains
[C] The blood pressure increases at high altitudes
[D] The blood pressure decreases at high altitudes
Show Answer
Correct Answer: A [The pressure of the blood capillaries is higher than the outside pressure]
Notes:
As altitude increases, the availability of oxygen decreases, making the air thinner and drier. Dry climates can cause drying and cracking inside the nose, which can lead to a nosebleed. The climate inside nose gets drier. This makes the blood vessels exposed inside your nose more likely to burst there than at lower altitudes.
13. 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.
14. Which among the following blood groups is referred as the universal donor blood group?
[A] O -ve
[B] O +ve
[C] AB -ve
[D] AB +ve
Show Answer
Correct Answer: A [O -ve]
Notes:
The person with O-ve blood group is considered as the universal donor. Whereas a person with O +ve is not a universal donor as O +ve consists of Rh(Rhesus) factor which makes it incompatible for Rh -ve bloods.
15. Where is eustachian tube present in the human body?
[A] Heart
[B] Lungs
[C] Ear
[D] Small Intestine
Show Answer
Correct Answer: C [Ear]
Notes:
Eustachian tube connects the middle ear and nasopharynx. This tube controls the pressure inside the ear and makes it equal to the pressure outside the body.
16. In which of the following organisms is the nuclear membrane absent?
[A] Nostoc
[B] Volvox
[C] Agaricus
[D] Penicillium
Show Answer
Correct Answer: A [Nostoc]
Notes:
Nostoc, also known as star jelly, troll’s butter, witch’s butter, and witch’s jelly, is a genus of cyanobacteria. Nostoc does not have a nuclear membrane. This is a characteristic of prokaryotic cells, which lack a nucleus. The genetic material in these cells is found in the cytoplasm, not enclosed within a nuclear membrane. On the contrary, Volvox, Agaricus, and Penicillium are all eukaryotic organisms, hence possess a nuclear membrane.
17. Which of the following causes chloroplasts to be green?
[A] because they contain the pigment cobalt
[B] because they contain the pigment chlorophyll
[C] because they contain the pigment carotenoids
[D] because they contain the pigment betacyanins
Show Answer
Correct Answer: B [because they contain the pigment chlorophyll]
Notes:
Chloroplasts are green because they contain the pigment chlorophyll, which is important for photosynthesis. Chlorophyll occurs in many different forms. Chlorophyll a and b are the major pigments of higher plants and green algae.
18. What is a nucleotide made of?
[A] purine, pyrimidine and phosphate
purine, pyrimidine and phosphate
[B] purine, sugar and phosphate
[C] nitrogen base, sugar and phosphate
[D] pyrimidine, sugar and phosphate.
Show Answer
Correct Answer: B [purine, sugar and phosphate]
Notes:
Nucleotide is an organic compound. It is a nitrogenous purine or pyrimidine base attached to a sugar (ribose or deoxyribose) and a phosphate group.
19. Which is the last stage of gametophytic generation?
[A] Gametes
[B] Zygote
[C] Spore mother cells
[D] Spores
Show Answer
Correct Answer: A [Gametes]
Notes:
Gametes are the last stage of gametophytic generation. Gametes can be described as the sex cells of plants.
20. Which is the innermost tissue and gives rise to the xylem and phloem?
[A] Protoderm
[B] Procambium
[C] Ground Meristem
[D] Promeristem
Show Answer
Correct Answer: B [Procambium]
Notes:
Procambium is the innermost tissue and gives rise to the xylem and phloem. It helps in transporting water and nutrients to different parts of the plant.
