11. Which of the following is the most common use of the reserprine derived from the plant ‘Serpentina’?
[A] Alleviate pain
[B] Alleviate high blood pressure
[C] Alleviate low blood pressure
[D] Cure rickets
Show Answer
Correct Answer: B [Alleviate high blood pressure]
Notes:
Reserpine drug is derived from the roots of certain species of the tropical plants. It is derived from the powdered whole root of the Indian shrub Rauwolfia serpentine. It can be used to treat snakebites, insomnia, hypertension (high blood pressure), and insanity.
12. Sex of a child is determined by which of the following?
[A] Chromosomes of father
[B] Chromosomes of mother
[C] Rh factor of parents
[D] None of these
Show Answer
Correct Answer: A [Chromosomes of father]
Notes:
Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome. An X chromosome combines with the mother’s X chromosome to make a baby girl (XX) and a Y chromosome will combine with the mother’s to make a boy (XY).
13. When compared to the mammals, birds are less sensitive to temporary deprivation of water, because?
[A] The water requirement per unit weight is less in birds than in mammals.
[B] Absorption of water from the gut is more efficient in birds than in mammals.
[C] Urea excretion in mammals entails a greater loss of water than that in birds.
[D] None of these
Show Answer
Correct Answer: A [The water requirement per unit weight is less in birds than in mammals.]
Notes:
When compared to the mammals, birds are less sensitive to temporary deprivation of water, because the water requirement per unit weight is less in birds than in mammals.
14. Who is known as the ‘Father of Bacteriology’?
[A] Louis Pasteur
[B] Leeuwenhoek
[C] Robert Hooke
[D] Edward Jenner
Show Answer
Correct Answer: A [Louis Pasteur]
Notes:
Louis Pasteur is considered as father of Bacteriology. Louis Pasteur was a French chemist and microbiologist who was one of the most important founders of medical microbiology. He pioneered the study of molecular heterogeneity; discovered that microorganisms cause fermentation and disease; Initiated the process of pasteurization and developed vaccines against anthrax and rabies.
15. The most abundant biomolecule on earth is__?
[A] Minerals
[B] Salts
[C] Carbohydrates
[D] Vitamins
Show Answer
Correct Answer: C [Carbohydrates]
Notes:
Carbohydrate is a biomolecule that is found in the most abundance on earth. Carbohydrates are mostly produced by green plant cells, algae and some bacteria.
16. What is the condition called when a virus enters a cell but does not replicate itself immediately?
[A] lysogeny
[B] fermentation
[C] symbiosis
[D] synergism
Show Answer
Correct Answer: A [lysogeny]
Notes:
Lysogeny is a type of life cycle that occurs when a bacteriophage infects certain types of bacteria.
17. Viruses reproduce in living cells by__?
[A] replication
[B] duplication
[C] multiplication
[D] all of these
Show Answer
Correct Answer: A [replication]
Notes:
DNA replication is the process by which a double-stranded DNA molecule is copied to produce two identical DNA molecules.
18. Which of the following is a group of plants that has the largest ovule, the largest gamete and the largest tree?
[A] Angiosperms
[B] Gymnosperms
[C] Pteridophytes
[D] Bryophytes
Show Answer
Correct Answer: B [Gymnosperms]
Notes:
A group of plants that has the largest ovule, the largest gamete and the largest tree is Gymnosperms.
19. Chemotaxis is a phenomenon of__?
[A] swimming away of bacteria
[B] swimming towards a bacteria
[C] swimming away or towards of bacteria in presence of chemical compound
[D] All of the above
Show Answer
Correct Answer: C [swimming away or towards of bacteria in presence of chemical compound]
Notes:
Chemotaxis is a phenomenon of swimming away or towards of bacteria in presence of chemical compound.
20. Dicotyledonous branches are found in which of the following?
[A] Fern
[B] Funaria
[C] Liverworts
[D] Marchantia
Show Answer
Correct Answer: C [Liverworts]
Notes:
Dicotyledonous branches are found in Liverworts. Liverworts are also moss-like land plants that do not have a vascular system.
