31. The persistence of vision for the human eye is __
[A] 1/6th of a second
[B] 1/10th of a second
[C] 1/16th of a second
[D] 1/18th of a second
Show Answer
Correct Answer: C [1/16th of a second]
Notes:
The persistence of vision for the human eye is 1/16th of a second. The process of seeing begins when light rays from the objects you see pass through the cornea, the clear, dome-like structure that covers your eyes.
32. Which statement is true about Passive Immunity?
[A] This immunity causes reactions
[B] This immunity develops immediately
[C] This immunity lasts only for a few weeks or months
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Passive immunity is conferred when a person is given antibodies to a disease rather than produced through their own immune system. A newborn baby receives passive immunity from its mother through the placenta.
33. Where does the fertilization of the egg take place with the sperm?
[A] Ovaries
[B] Fallopian tubes
[C] Uterus
[D] Vagina
Show Answer
Correct Answer: B [Fallopian tubes]
Notes:
The fertilization of the egg with the sperm occurs in the fallopian tube.
34. Which of the following hormone are surges that trigger ovulation?
[A] Estrogen
[B] LH
[C] FSH
[D] Progesterone
Show Answer
Correct Answer: B [LH]
Notes:
LH hormones are surges that trigger ovulation. It is released by the anterior pituitary.
35. An animal, plant, or micro-organism whose DNA has been altered using genetic engineering techniques is called?
[A] Genetically Matured Organisms
[B] Genetically Mental Organs
[C] Genetically Modified Organisms
[D] Genetically Mutant Organism
Show Answer
Correct Answer: C [Genetically Modified Organisms]
Notes:
An animal, plant, or micro-organism whose DNA has been altered using genetic engineering techniques is called Genetically Modified Organisms.
36. Which of the following are examples of hydrophilic molecules?
[A] sugar
[B] cellulose
[C] starch
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
A molecule whose interaction with water and other polar substances is more thermodynamically favorable than its interaction with oil or other hydrophobic solvents is called a hydrophilic molecule. Sugar, salt, starch, and cellulose are examples of hydrophilic molecules.
37. ____ being a higher category, is the assemblage of families which exhibit a few similar characters:
[A] Class
[B] Species
[C] Genus
[D] Order
Show Answer
Correct Answer: D [Order]
Notes:
Order is an assemblage of families which exhibit a few similar characters. The similar characters are less in number as compared to different genera included in a family. A class includes one or more orders.
38. Which of the following microorganisms is used in milk curdling?
[A] Bacillus
[B] Lactobacillus
[C] Leuconostoc
[D] Acetobacter
Show Answer
Correct Answer: B [Lactobacillus]
Notes:
Lactobacillus acidiphilous is used in milk curdling by producing lactic acid and reducing the pH of the milk. These bacteria convert the lactose into lactic acid, which imparts the sour taste to curd. It is a genus of Gram positive facultative anaerobic or microaerophilic rod-shaped bacteria.
39. For immediate energy production in cells, one should take ____:
[A] Glucose
[B] Proteins
[C] Sucrose
[D] Vitamin C
Show Answer
Correct Answer: A [Glucose]
Notes:
Glucose provides immediate energy for our brain and red blood cells. The most pressing need of all cells in the body is for an immediate source of energy. Some cells such as brain cells have severely limited storage capacities for either glucose or ATP, and for this reason, the blood must maintain a fairly constant supply of glucose.
40. Bark of which tree is used as a condiment?
[A] Palm
[B] Neem
[C] Cinnamon
[D] Clove
Show Answer
Correct Answer: C [Cinnamon]
Notes:
Cinnamon is a spice obtained from the inner bark of several trees from the genus Cinnamomum that is used in both sweet and savoury foods. The bark must be processed immediately after harvesting while still wet. Once processed, the bark will dry completely in four to six hours, provided that it is in a well-ventilated and relatively warm environment.
