11. Which of the following does not hold true for Animal belonging to Phylum chordate?
[A] A post-anal part(tail) is present
[B] Notochord present
[C] Pharynx perforated by gill slits.
[D] Heart is dorsal(if present)
Show Answer
Correct Answer: D [Heart is dorsal(if present)]
Notes:
Chordata is a familiar phylum that includes organisms like mammals, fish, birds, reptiles, and amphibians (all vertebrates); sea squirts (tunicates); and lancelets (cephalochordates).
12. How Green plants in the sea are useful for the respiration of fish? (UPSC Prelims 1979).
[A] They give out oxygen
[B] They give out carbon dioxide
[C] The give out oxygen and carbon dioxide simultaneously
[D] They take oxygen and give out carbon dioxide
Show Answer
Correct Answer: A [They give out oxygen]
Notes:
Oxygen is a natural element which no animal can live without. Fish and other aquatic animals depend on oxygen gas dissolved in water as much as people depend on oxygen gas in air. Many people are surprised to learn that fish and other aquatic organisms don’t use oxygen from water molecules (H2O). This is because the single oxygen molecule (O) is bound to the two hydrogen molecules (H2) and is not useable in this form. Instead, aquatic organisms depend on dissolved oxygen gas (O2), a colorless, tasteless and odorless substance that enters the water from plants and the atmosphere.
13. Which blood group is referred to as universal recipient?
[A] AB +ve
[B] AB -ve
[C] O +ve
[D] O -ve
Show Answer
Correct Answer: A [AB +ve]
Notes:
Persons with AB +ve blood group are called as universal recipients as they can get blood from persons with any of the blood groups. AB -ve cannot be regarded as universal donor as it cannot accept blood from persons with Rh factor.
14. Which of the following biologist is related to Cell Theory?
[A] Carl Linnaeus
[B] Theophrastus
[C] Theodor Schwann
[D] Francis Galton
Show Answer
Correct Answer: C [Theodor Schwann]
Notes:
The classical cell theory was proposed by Theodor Schwann in 1839. There are three parts to this theory. The first part states that all organisms are made up of cells. The second part states that cells are the basic units of life. The third part, which claims that cells come from pre-existing cells that have multiplied, was described by Rudolf Virchow in 1858.
15. Who among the following discovered Vitamin C?
[A] Albert Szent-Györgyi
[B] Funk
[C] Evans and Bishop
[D] Henrik Dam
Show Answer
Correct Answer: A [Albert Szent-Györgyi]
Notes:
Albert Szent-György is the scientist who discovered Vitamin C. Vitamin C is a water-soluble vitamin. The chemical name is Ascorbic acid.
16. Which of the following is a sexual spore?
[A] Ascospore
[B] Sporangiospore
[C] Conidia
[D] Zoospore
Show Answer
Correct Answer: A [Ascospore]
Notes:
The ascospore is a spore contained in an ascus; this type of spore is typical of fungi classified as ascomycetes.
17. Which of the following is the simplest amino acid?
[A] Glycine
[B] Tyrosine
[C] Alanine
[D] Asparagine
Show Answer
Correct Answer: A [Glycine]
Notes:
Glycine is the simplest amino acid. It contains a single hydrogen atom as a side chain. It is also a type of proteinogenic amino acid.
18. Which of the following is required by viruses for growth?
[A] bacteria
[B] plants
[C] animals
[D] living cells
Show Answer
Correct Answer: D [living cells]
Notes:
Virus, infectious agent of small size and simple structure that can multiply only in living cells of animals, plants or bacteria.
19. Which virus belongs to the family Caliciviridae?
[A] Hepatitis B virus
[B] Hepatitis D virus
[C] Hepatitis E virus
[D] All of these
Show Answer
Correct Answer: C [Hepatitis E virus]
Notes:
The Caliciviridae family contains five genera are Norovirus, Sapovirus, Lagovirus, Vesivirus, and Nebovirus.
20. Which of the following tissue provides strength to the plant?
[A] Intercalary
[B] Parenchyma
[C] Sclerenchyma
[D] Collenchyma
Show Answer
Correct Answer: C [Sclerenchyma]
Notes:
Sclerenchyma provides strength to the plant. It is found in the covering of seeds and nuts, around the vascular tissues in stems and the veins of leaves.
