11. A man whose blood group is not known meets with a serious accident and needs blood transfusion immediately. Which one of the blood groups mentioned below and readily available in the hospital will be safe for transfusion? (UPSC Prelims 2001)
[A] O, Rh-
[B] O, Rh+
[C] AB, Rh-
[D] AB, Rh+
Show Answer
Correct Answer: B [O, Rh+]
Notes:
There is no A and B antigen on RBC of “O– ”bloodgroup , So O, Rh– is known as universal blood donor.
12. Which one of the following statements is correct? (UPSC Prelims 2002)
[A] Prions are the smallest free-living cells
[B] The cell wall of Mycoplasmas is made up of amino sugars
[C] Viroids consist of a single-stranded RNA molecule
[D] Rickettsias lack cell wall
Show Answer
Correct Answer: C [Viroids consist of a single-stranded RNA molecule]
Notes:
Viroids are the smallest infectious pathogens known. They are composed solely of a short strand of circular, single-stranded RNA that has no protein coating. All known viroids are inhabitants of higher plants, in which most cause diseases, ranging in economic importance.
13. Which vitamin is also called as ascorbic acid?
[A] Vitamin A
[B] Vitamin C
[C] Vitamin D
[D] Vitamin K
Show Answer
Correct Answer: B [Vitamin C]
Notes:
Vitamin C is also called as ascorbic acid. Deficiency in vitamin C leads to scurvy. Chemical formula of vitamin C is C6H8O6.
14. Who is the father of Modern Embryology?
[A] Antonie Van Leeuwenhoek
[B] Stephen Hales
[C] Karl Ernst von Bayer
[D] Georges Cuvier
Show Answer
Correct Answer: C [Karl Ernst von Bayer]
Notes:
Karl Ernst von Bayer was a Prussian-Estonian embryologist who discovered the mammalian ovum and notochord and founded the new science of comparative embryology with comparative anatomy.
15. Germplasm theory was given by which of the following biologists?
[A] August Weismann
[B] Georges Cuvier
[C] Arthur Tansley
[D] None of these
Show Answer
Correct Answer: A [August Weismann]
Notes:
Germ-plasm theory, the concept of the physical basis of heredity, articulated by the 19th century biologist August Weismann.
16. Which of the following person related to the invention of DDT?
[A] Paul Muller
[B] Roe Berth
[C] Frances Kelsey
[D] Jack Horner
Show Answer
Correct Answer: A [Paul Muller]
Notes:
DDT was first synthesized in 1874 by Austrian chemist Othmar Zidler. The insecticidal action of DDT was discovered in 1939 by the Swiss chemist Paul Hermann Müller.
17. Green Algae are known as__?
[A] Rhodophyceae
[B] Chlorophyceae
[C] Phaeophyceae
[D] Green tide
Show Answer
Correct Answer: B [Chlorophyceae]
Notes:
Algae is a Thalloid plant and autotrophic in nature. Mostly algae is aquatic and contains chlorophyll. Green algae is also known as Chlorophyceae.
18. Which of the following comprise plant decomposers?
[A] Monera and fungi
[B] Plantae and fungi
[C] Monera and Animalia
[D] Animalia and Protista
Show Answer
Correct Answer: A [Monera and fungi]
Notes:
Decomposers are a type of bacteria and fungi that break down dead and decaying organic matter into simpler things like carbon dioxide, water, simple sugars and mineral salts, and return nutrients to the soil.
19. Gonyaulax, which are known for causing red tides, belong to which of the following?
[A] Algae
[B] Fungi
[C] Protista
[D] Bacteria
Show Answer
Correct Answer: C [Protista ]
Notes:
Red tides are caused by Gonyaulax which are small, microscopic organisms that grow in water and also called dinoflagellates.
20. Which of the following cell organelles contain RNA?
[A] Plastids
[B] Mitochondria
[C] Ribosomes
[D] Lysosomes
Show Answer
Correct Answer: C [Ribosomes]
Notes:
Ribosomes are small organelles that contain RNA and specific proteins within the cytoplasm.
