11. Pollination by which among the following is called as ornithophily?
[A] Rodents
[B] Aquatic animals
[C] Ants
[D] Birds
Show Answer
Correct Answer: D [Birds]
Notes:
Ornithophily refers to the pollination assisted by the birds. Ornithology is a branch of science which studies about birds. Dr. Salim Ali is a famous Indian ornithologist.
12. Who were the first scientists successfully isolated insulin in 1921?
[A] Frederick Banting and Charles Herbert Best
[B] Robert Hooke and Gregor Mendel
[C] Charles Darwin and Antonie van Leeuwenhoek
[D] Rachel Carson and Theodor Schwann
Show Answer
Correct Answer: A [Frederick Banting and Charles Herbert Best]
Notes:
Insulin was the first peptide hormone discovered. Canadians Frederick Banting and Charles Herbert Best were the first scientists successfully isolated insulin from the dog pancreas in 1921. They achieved this tremendous feat while working in Canada’s University of Toronto J.J.R. Macleod Laboratory.
13. What was “Albert Szent-Gyorgyi” famous for?
[A] As a Hungarian biochemist
[B] As a Hungarian physicist
[C] As a Hungarian mathematician
[D] As a Hungarian novelist
Show Answer
Correct Answer: A [As a Hungarian biochemist ]
Notes:
Albert Szent-Gyorgyi was a Hungarian biochemist who won the Nobel Prize in Physiology or Medicine in 1937. He is credited with first isolating vitamin C and discovering the components and reactions of the citric acid cycle. He was also active in the Hungarian Resistance during World War II and entered Hungarian politics after the war.
14. Which of the following is the function of contractile vacuole?
[A] To carry out pinocytosis
[B] To carry out metabolic process
[C] To pump excess water out of the cell
[D] To carry out phagocytosis
Show Answer
Correct Answer: C [To pump excess water out of the cell]
Notes:
Contractile vacuoles that regulate intracellular water balance by storing and expelling excess water from the cell.
15. Which of the following are blue-green algae?
[A] Prokaryotes
[B] Eukaryotes
[C] Both 1 and 2
[D] Neither 1 nor 2
Show Answer
Correct Answer: A [Prokaryotes]
Notes:
Blue-green algae or cyanobacteria are prokaryotes. They lack membrane bound organelles and a nucleus.
16. Which of the following is hemoglobin?
[A] Primary structure
[B] Secondary structure
[C] Tertiary structure
[D] Quaternary structure
Show Answer
Correct Answer: D [Quaternary structure]
Notes:
Hemoglobin has a quaternary structure. It consists of two pairs of separate proteins, designated α and β chains.
17. Which virus belongs to the family Flaviviridae?
[A] Rubella virus
[B] Yellow fever virus
[C] Hepatitis C virus
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
Flaviviridae contains three genera which are Flavivirus, Hepacivirus, and Pestivirus. Flaviviruses have enveloped and spherical virions. The flavivirus genome consists of non-segmented single-stranded positive-sense RNA (ribonucleic acid).
18. Cooci which are mostly single or in pairs are called?
[A] Streptococci
[B] Diplococci
[C] Tetracocci
[D] None of these
Show Answer
Correct Answer: B [Diplococci]
Notes:
A diplococcus is a round bacterium (a coccus). It usually occurs as two joined cells.
19. Most of the gymnosperms have__?
[A] Only antheridia
[B] Both antheridia and archegonia
[C] Archegonia but no antheridia
[D] Both absent
Show Answer
Correct Answer: C [Archegonia but no antheridia]
Notes:
Archegonia is found in bryophytes, pteridophytes and gymnosperms. It occurs in antheridia bryophytes and pteridophytes.
20. Drying, wilting, and dropping of leaves of a plant due to insufficient water supply, excessive transpiration, or any vascular disease is called
[A] Guttation
[B] Phyllotaxy
[C] Wilting
[D] Phyllode
Show Answer
Correct Answer: C [Wilting]
Notes:
Drying, wilting, and dropping of leaves of a plant due to insufficient water supply, excessive transpiration, or any vascular disease is called Wilting.
