1. Which of the following correctly defines “Mother-of-pearl”?
[A] An oyster which yields the pearl
[B] A special large sized pearl found in Japan
[C] A hard iridescent substance forming the inner layer of certain shells
[D] Female individuals of certain species of shelled mollusk
Show Answer
Correct Answer: C [ A hard iridescent substance forming the inner layer of certain shells ]
Notes:
Nacre also known as mother of pearl, is an organic-inorganic composite material produced by some mollusks as an inner shell layer; it is also what makes up the outer coating of pearls. It is strong, resilient, and iridescent.
2. A gene is a functional unit of ___?
[A] Life
[B] Cell
[C] DNA
[D] Chromosomes
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Correct Answer: D [Chromosomes]
Notes:
A gene is a functional unit of chromosomes. They are made up of DNA. Some genes also act as instructions to make molecules called proteins. However, not all genes code for proteins.
3. Enteric fermentation is fermentation that takes place in the digestive systems of ruminant animals. It is one of the reasons for increased ________emissions?
[A] Carbondioxide
[B] Methane
[C] Ammonia
[D] Sulphur
Show Answer
Correct Answer: B [Methane]
Notes:
Enteric fermentation is a digestive process that takes place in the digestive systems of ruminant animals by which carbohydrates are broken down by microorganisms into simple molecules for absorption into the bloodstream of an animal.
4. Ornithophily refers to the pollination through which among the following?
[A] Wind
[B] Insects
[C] Birds
[D] Water
Show Answer
Correct Answer: C [Birds]
Notes:
Ornithophily refers to the pollination through birds. Birds which are involved in ornithophily are specialist nectarivores with brushy tongues and long bills, that are either capable of hovering flight or light enough to perch on the flower structures.
5. The Gram Positive Bacteria can be identified by the Gram staining because of the following reasons?
[A] The cell walls have more lipids compared to peptidoglycan
[B] The Cells walls have more Peptidoglycan compared to Lipids
[C] The Cells membrane has more fatty acids
[D] The plasma has Peptidoglycans
Show Answer
Correct Answer: B [The Cells walls have more Peptidoglycan compared to Lipids]
Notes:
The cell wall which is made up of Peptidoglycan as well as lipids gets violet due to the reaction of the CV+. After the decolorization with alcohol, the lipids gets dissolved and the bacteria with higher Peptidoglycan remain violet. These are called Gram Positive bacteria.
6. Which of the following branches of Biology is not associated with snakes ?
[A] Herpetology
[B] Ophiology
[C] Serpentology
[D] Saurology
Show Answer
Correct Answer: D [Saurology]
Notes:
All of the three –Herpetology, Ophiology and Serpentology are associated to the study of snakes.While Saurology is associated to the study of Lizards. Thus Option [D] is correct.
7. Anatomically, the beak of birds is equivalent of which of the following?
[A] Teeth
[B] Cheeks
[C] Jaws
[D] None of the above
Show Answer
Correct Answer: C [Jaws]
Notes:
The beak, bill or rostrum is an external anatomical structure of birds that is used for eating and for preening, manipulating objects, killing prey, fighting, probing for food, etc. All beaks are composed of two jaws, generally known as the upper mandible (or maxilla) and lower mandible (or mandible).
8. Which organs have different basic structures, yet present a similarity in appearance and perform analogous functions?
[A] Kidney and liver
[B] Heart and lungs
[C] Wings of a bat and a bird
[D] Brain and spinal cord
Show Answer
Correct Answer: C [Wings of a bat and a bird]
Notes:
This is a unique example of convergent evolution in which organs can serve similar purposes but originate from very different original structures. Wings of a bat and bird serve the same purpose, flight, yet they have different underlying structures, resulting from a different evolutionary path.
9. Which of the following is a non-poisonous snake?
[A] Python
[B] Hognose snake
[C] Garter snake
[D] Ribbon snake
Show Answer
Correct Answer: A [Python]
Notes:
Python is a non-poisonous snake. Pythons are large muscular snakes which grow up to 35 feet and weigh as much as 300 pounds. Pythons are well known for the way they kill their preys by squeezing then to death and then swallowing them all at once.
10. Which of the following micro-organism causes diseases like polio and chicken pox?
[A] Bacteria
[B] Protozoa
[C] Algae
[D] Virus
Show Answer
Correct Answer: D [Virus]
Notes:
Poliomyelitis or polio is an infection caused by the polio virus. It is a serious disease affecting a person’s brain and spinal cord. Chickenpox, also known as varicella, is a highly contagious disease caused by the initial infection with varicella zoster virus (VZV).
