11. ‘Pace-maker’ is associated with which of the following body organs?
[A] Liver
[B] Brain
[C] Heart
[D] Lungs
Show Answer
Correct Answer: C [Heart]
Notes:
A pacemaker is a small device that’s placed in the chest or abdomen to help control abnormal heart rhythms. This device uses electrical pulses to prompt the heart to beat at a normal rate.
12. Which one of the following is a membrane that protects the developing embryo from desiccation? (UPSC Prelims 1995)
[A] Amnion
[B] Allantois
[C] Chorion
[D] Yolk sac
Show Answer
Correct Answer: A [Amnion]
Notes:
The amnion or amniotic sac protects everyone embryo from desiccation, it contains amniotic fluid which cushions the embryo from shocks.
13. A person with ‘AB’ blood group is sometimes called a universal recipient because of the? (UPSC Prelims 1995)
[A] lack of antigen in his blood
[B] lack of antibodies in his blood
[C] lack of both antigens and antibodies in his blood
[D] presence of antibodies in his blood
Show Answer
Correct Answer: B [lack of antibodies in his blood]
Notes:
Type AB is considered the universal recipient, as they have both A and B antigens on their red blood cells, and thus their body does not have antibodies against A or B antigen cells, so they can receive blood from any blood type.
14. Who is called the father of Immunology?
[A] Gregor Mendel
[B] Edward Jenner
[C] Francis Galton
[D] Hugo de Vries
Show Answer
Correct Answer: B [Edward Jenner]
Notes:
Edward Jenner is an English surgeon and discoverer of smallpox vaccination. That’s why he is called the father of immunology.
15. Phototropism Theory is related to which of the following scientist?
[A] Jane Goodall
[B] Charles Darwin
[C] Francis Galton
[D] None of these
Show Answer
Correct Answer: B [Charles Darwin]
Notes:
Plant physiologists have investigated phototropism for over 100 years. The best known early research on phototropism was by Charles Darwin.
16. Who introduced the three kingdoms of classification?
[A] RH Whittaker
[B] Ernest Haeckel
[C] Copeland
[D] Carolus Linnaeus
Show Answer
Correct Answer: B [Ernest Haeckel]
Notes:
Plantae, Protista and Animalia are the three kingdom of Classification introduced by Ernest Haeckel.
17. Where are glycolipids located in the plasma membrane?
[A] Inner leaflet of the plasma membrane
[B] The outer leaflet of the plasma membrane
[C] evenly distributed in inner and outer leaflets
[D] It varies by cell type
Show Answer
Correct Answer: B [The outer leaflet of the plasma membrane]
Notes:
Glycolipids are found in the outermost leaflet of the plasma membrane, their carbohydrate portions visible on the cell surface.
18. 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.
19. Which bacteria are used in production of biogas/gobar gas plants?
[A] Methanogens
[B] Ethanogens
[C] Propanogens
[D] N-butane
Show Answer
Correct Answer: A [Methanogens]
Notes:
Methanogens belong to the Euryarchaeota of the Archaebacteria. They convert inorganic organic compounds into methane and carbon dioxide.
20. 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.
