1. An example of Protozoa, Anthropod, Aves, Mammal & Reptile is respectively __________?
[A] Amoeba, Lizard, Scorpion , Bat, Hen
[B] Amoeba, Scorpion, Hen, Bat , Lizard
[C] Amoeba, Scorpion, Bat ,Hen, Lizard
[D] Lizard, Amoeba, Scorpion, Bat ,Hen
Show Answer
Correct Answer: B [Amoeba, Scorpion, Hen, Bat , Lizard]
Notes:
An example of Protozoa, Anthropod, Aves, Mammal & Reptile is Amoeba, Scorpion, Hen, Bat , Lizard respectively.
2. Where does the formation of Urea takes place in our body ?
[A] Pancreas
[B] Kidney
[C] Liver
[D] Lungs
Show Answer
Correct Answer: C [Liver]
Notes:
The formation of Urea takes place in Liver. Urea which is also known as carbamide, is a waste product of many living organisms. It is the major organic component of human urine.
3. Japanese encephalitis is a disease caused by __ ?
[A] Virus
[B] Protozoa
[C] Bacteria
[D] Fungi
Show Answer
Correct Answer: A [Virus]
Notes:
Japanese encephalitis is caused by virus from the family Flaviviridae. It’s a Mosquito Borne Disease
4. Which among the following enzyme plays an important role in adding the building blocks to the primer in a sequence determined by the DNA template?
[A] Helicase
[B] Primase
[C] Polymerase
[D] Diastase
Show Answer
Correct Answer: C [Polymerase]
Notes:
Polymerase enzyme plays an important role in adding the building blocks to the primer in a sequence determined by the DNA template. It synthesizes long chains of polymers or nucleic acids.
5. The Indian Pipe Plant or Monotrapa can be best placed in which among the following groups?
[A] Parasite
[B] Saprophyte
[C] Insectivorous
[D] Lithophyte
Show Answer
Correct Answer: B [Saprophyte]
Notes:
Pipe Plant is a total saprophyte i.e. thrives on dead or decayed organic matter
6. With reference to classification of the animals, which among the following groups represents Elasmobranchs?
[A] Shark, Skates and Rays
[B] Shark, Rays and Dolphins
[C] Shark, Skates and Dolphins
[D] Skates, Dolphins and Rays
Show Answer
Correct Answer: A [ Shark, Skates and Rays]
Notes:
The term Elasmobranches is a collective name for the sharks, skates and rays. Elasmobranches have a skeleton made of cartilage, no swim bladders and rough skin made up of small dermal dentils. Elasmobranches are renowned for their highly tuned senses.
7. Which of the following is the smallest known prokaryotic organism?
[A] Mycoplasma
[B] Bacteria
[C] Chlorella
[D] Microcystis
Show Answer
Correct Answer: A [Mycoplasma]
Notes:
Mycoplasma genitalium, a parasitic bacterium which lives in the primate bladder, waste disposal organs, genital, and respiratory tracts, is thought to be the smallest known organism capable of independent growth and reproduction.
8. Which of the following is the first formed primary xylem elements?
[A] Protoxylem
[B] Xylem parenchyma
[C] Metaxylem
[D] Xylem fibres
Show Answer
Correct Answer: A [Protoxylem]
Notes:
Protoxylem is the first part of the primary xylem that matures and these cells are usually smaller than the metaxylem. Metaxylem is the part of the primary xylem that differentiates after the protoxylem and these cells are usually larger than the protoxylem.
9. At which of the following stages the sex of the offspring is determined?
[A] The conception takes place
[B] The sperm fertilises the ovum
[C] The embryo is partially developed
[D] The end of gestation period is near
Show Answer
Correct Answer: A [The conception takes place]
Notes:
Biological sex is determined by a pair of sex chromosomes: XY in males and XX in females. Genes on the X chromosome are said to be X-linked. X-linked genes have distinctive inheritance patterns because they are present in different numbers in females (XX) and males (XY).Thus usually occurs as soon as conception takes place.
10. The sensation of fatigue in the muscles after prolonged strenuous physical work is caused by? (UPSC Prelims 2000)
[A] a decrease in the supply of oxygen
[B] minor wear and tear of muscle fibres
[C] the depletion of glucose
[D] the accumulation of lactic acid
Show Answer
Correct Answer: D [the accumulation of lactic acid]
Notes:
The sensation of fatigue which the muscles feel after a prolonged and a strenuous physical workout is caused by the accumulation of lactic acid.
This is so because lactic acid buildup tends to cause fatigue and soreness in the muscles.
There is a burning sensation felt up in the muscles when buildup of acid happens in muscles during exercise. This is also known as acidosis.
