11. How Green plants in the sea are useful for the respiration of fish? (UPSC Prelims 1979).
[A] They give out oxygen
[B] They give out carbon dioxide
[C] The give out oxygen and carbon dioxide simultaneously
[D] They take oxygen and give out carbon dioxide
Show Answer
Correct Answer: A [They give out oxygen]
Notes:
Oxygen is a natural element which no animal can live without. Fish and other aquatic animals depend on oxygen gas dissolved in water as much as people depend on oxygen gas in air. Many people are surprised to learn that fish and other aquatic organisms don’t use oxygen from water molecules (H2O). This is because the single oxygen molecule (O) is bound to the two hydrogen molecules (H2) and is not useable in this form. Instead, aquatic organisms depend on dissolved oxygen gas (O2), a colorless, tasteless and odorless substance that enters the water from plants and the atmosphere.
12. Where does the Fat stored in human body? (UPSC Prelims 1983)
[A] Muscular tissue
[B] Connective tissue
[C] Adipose tissue
[D] Epithelial tissue
Show Answer
Correct Answer: C [Adipose tissue]
Notes:
Adipose tissue is an anatomical term for loose connective tissue composed of adipocytes. Its main role is to store energy in the form of fat, although it also cushions and insulates the body.
13. Bile is secreted by which of the following organs? (UPSC Prelims 1985)
[A] Liver
[B] Gall bladder
[C] Kidney
[D] Pancreas
Show Answer
Correct Answer: A [Liver]
Notes:
Bile or gall is a dark green to yellowish brown fluid, produced by the liver of most vertebrates that aids the digestion of lipids in the small intestine. In humans, bile is produced continuously by the liver and stored and concentrated in the gallbladder.
14. Which among the following is the longest bone in human body?
[A] Stapes
[B] Femur
[C] Pelvis
[D] Sternum
Show Answer
Correct Answer: B [Femur]
Notes:
Femur is the longest and strongest bone in the human body. It is also called as the thigh bone.
15. What does B denote in the term RBCs ?
[A] Build
[B] Blood
[C] Bloody
[D] Building
Show Answer
Correct Answer: B [Blood]
Notes:
The term RBC stands for Red Blood Cells (RBCs) which performs the function of transferring oxygen to other tissues of the body. The RBCs are also known as Red Blood Corpuscles.
16. The Study of Bryophytes & pteridophytes is known by Which terms?
[A] Cytology
[B] Bryology
[C] Mycology
[D] Pomology
Show Answer
Correct Answer: B [Bryology]
Notes:
Bryology is the branch of botany that deals with the scientific study of bryophytes such as mosses, liverworts, and hornworts.
17. How many bacterial cells are there in the human body?
[A] around 28 trillion
[B] around 38 trillion
[C] around 48 trillion
[D] around 58 trillion
Show Answer
Correct Answer: B [around 38 trillion]
Notes:
The number of bacterial cells inside the human body is approximately 38 trillion. This is very close to the estimated 30 trillion human cells in the body.
18. Which of the following can be done in the cultivation of plant viruses?
[A] tissue culture
[B] cultures of separated cells
[C] whole plants
[D] all of these
Show Answer
Correct Answer: D [all of these]
Notes:
The cultivation of plant viruses can be done in tissue culture, cultures of separated cells and whole plants.
19. Which of the following can affect proteins and nucleic acids, but not viruses?
[A] Denaturation
[B] Enzyme treatment
[C] Pressure
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
Because it affects proteins upon denaturation, this nuclease enzymes affect nucleic acids and the pressure will affect the structure but not the virus.
20. Which of the following are non-motile, highly thickened asexual spores called?
[A] Hypnospores
[B] Aplanospores
[C] Macrozoospores
[D] Microzoospores
Show Answer
Correct Answer: A [Hypnospores]
Notes:
Hypnospores are thick-walled structures that form under unfavorable conditions. Under prolonged unfavorable conditions, the protoplasm of hypnospores divides to form cysts. Cysts are capable of forming new thallus.
