11. What is Chloramphenicol?
[A] It is an antibiotic
[B] It is an antiseptic
[C] It is an antacid
[D] It is an analgesic
Show Answer
Correct Answer: A [ It is an antibiotic]
Notes:
Chloramphenicol is a broad spectrum antibiotic. It can be given orally in case of typhoid, dysentery, acute fever, certain form of urinary infections, meningitis and pneumonia.
12. In humans, the sound is produced by the which of the following?
[A] epiglottis
[B] oesophagus
[C] larynx
[D] medulla
Show Answer
Correct Answer: C [larynx]
Notes:
The larynx is another name for the voice box. It’s a tube about 2 inches (5cm) long in adults. It sits above the windpipe (trachea) in the neck and in front of the food pipe.
13. Which of the following is/are found in plant cells but not in those of animals? (UPSC Prelims 1987)
[A] Plastid & Cellular wall
[B] Chromosome
[C] Mitochondria & Golgi apparatus
[D] Cell wall & lysozyme
Show Answer
Correct Answer: A [Plastid & Cellular wall]
Notes:
Plant cells have a cell wall, chloroplasts and other specialized plastids, and a large central vacuole, which are not found within animal cells.
14. Photosynthesis generally occurs in which portions of the plant? (UPSC Prelims 1987)
[A] Leaf and other chloroplast bearing parts
[B] Steam and leaf
[C] Roots and chloroplast bearing parts
[D] Bark and leaf
Show Answer
Correct Answer: A [Leaf and other chloroplast bearing parts]
Notes:
Photosynthesis can take place in leaves, stem or green part of plant which containing chlorophyll.
15. Phenylketonuria is an example of an in born error of metabolism. This “error” refers to which of the following phenomenon? (UPSC Prelims 1994)
[A] hormonal overproduction
[B] atrophy of endocrine glands
[C] inherited lack of an enzyme
[D] non-disjunction
Show Answer
Correct Answer: B [atrophy of endocrine glands]
Notes:
Phenylketonuria (PKU) is an inborn error of metabolism due to atrophy of endocrine glands that results in decreased metabolism of the amino acid phenylalanine. Untreated, PKU can lead to intellectual disability, seizures, behavioral problems, and mental disorders. It may also result in a musty smell and lighter skin.
16. Which among the following is responsible for the red colour of blood?
[A] Haemoglobin
[B] Platelets
[C] Plasma
[D] None of the above
Show Answer
Correct Answer: A [Haemoglobin]
Notes:
Haemoglogin pigment is responsible for the red colour of the blood. Haemoglobin is responsible for carrying oxygen from lungs to the tissues of the body.
17. Which branch of biology is known for the study of plant fossils?
[A] Paleobotany
[B] Morphology
[C] Lichenology
[D] Agronomy
Show Answer
Correct Answer: A [Paleobotany]
Notes:
Paleobotany is the scientific study of ancient plants using plant fossils found in sedimentary rocks.
18. Which of the following is not an example of bryophytes?
[A] Marchantia
[B] Funaria
[C] Sphagnum
[D] Selaginella
Show Answer
Correct Answer: D [Selaginella]
Notes:
Selaginella is not an example of bryophytes. Selaginella, Equisetum, Pteris, etc.are examples of Pteridophyta.
19. Algae cell wall is made up of which of the following?
[A] Chitin
[B] Cutin
[C] Cellulose
[D] Suberin
Show Answer
Correct Answer: C [Cellulose]
Notes:
The Algae cell wall is made up of Cellulose.
20. In gymnosperms how many male gametes are produced by each pollen grain?
[A] 4
[B] 3
[C] 2
[D] 1
Show Answer
Correct Answer: C [2]
Notes:
In gymnosperms, there are only 2 male gametes are produced by each pollen grain.
