31. Which of the following is commonly known as the narrow-mouthed frog?
[A] Ranidae
[B] Hylidae
[C] Myrohylidae
[D] Bufonidae
Show Answer
Correct Answer: C [Myrohylidae]
Notes:
Mycrohylidae is commonly known as narrow-mouthed frogs. It is a geographically widespread family of frogs.
32. Which part of the ear has no role to play in hearing but is very important?
[A] Ear ossicles
[B] Organ of Corti
[C] Eustachian tube
[D] Vestibular apparatus
Show Answer
Correct Answer: D [Vestibular apparatus]
Notes:
The vestibular system is the sensory system of the inner ear that helps the body maintain its postural balance.
33. Which of the following cells is involved in humoral immunity?
[A] T-cells
[B] B-cells
[C] Mast cells
[D] Both T and B cells
Show Answer
Correct Answer: B [B-cells]
Notes:
B cells are a type of lymphocyte responsible for the humoral immune component of the adaptive immune system.
34. The corpus luteum is the source of secretion of:
[A] LH
[B] Estradiol
[C] Estrogen
[D] Progesterone
Show Answer
Correct Answer: D [Progesterone]
Notes:
The corpus luteum is the source of secretion of Progesterone. Progesterone is a hormone released by the ovaries.
35. What is fertilization?
[A] Release of egg from the ovary
[B] Release of sperm from testis
[C] Mixing of semen with vaginal fluid
[D] Fusion of sperm with egg nuclei
Show Answer
Correct Answer: D [Fusion of sperm with egg nuclei]
Notes:
The release of an egg from the ovary is called Ovulation. Sperm is the release of sperm from the testis. Conception is the release of semen into the vagina. Fertilization is the process that leads to the fusion of male and female gametes.
36. Wooden tongue in cattle is caused by which of the following bacteria?
[A] Sphaerophorus necrophorus
[B] Clostridium chauvoei
[C] Actinobacillus lignieresi
[D] Erysipelothrix insidiosa
Show Answer
Correct Answer: C [Actinobacillus lignieresi]
Notes:
Wooden tongue in cattle is caused by Actinobacillus lignieresi bacteria.
37. Syphilis is a bacterial infection usually spread by __
[A] Sexual contact
[B] Wound infection
[C] Air-borne droplets
[D] None of these
Show Answer
Correct Answer: A [Sexual contact]
Notes:
Syphilis is a bacterial infection mostly spread by sexual contact. It is caused by Treponema pallidum bacteria.
38. Grey hair is caused due to
____:
[A] Aging of epidermal cells
[B] Death of dermal cells
[C] Loss of sebum in epidermal cells
[D] Loss of melanin in epidermal cells
Show Answer
Correct Answer: D [Loss of melanin in epidermal cells]
Notes:
The hair follicles have pigment cells that make melanin, a chemical that gives the hair its color. As one ages, these cells start to die. Without pigment, new hair strands grow in lighter and take on various shades of gray, silver, and eventually white.
39. Protein part of enzyme is known as ____:
[A] Isoenzyme
[B] Holoenzyme
[C] Apoenzyme
[D] All of the above
Show Answer
Correct Answer: C [Apoenzyme]
Notes:
Enzymes are defined as biological catalysts. Chemically all enzymes are globular proteins. Each enzyme catalyses only one chemical reaction. Protein part of enzyme is known as Apoenzyme. It forms an active enzyme system by combination with a coenzyme and determines the specificity of this system for a substrate.
40. Which of the following increases the rate of heart beat?
[A] Peripheral nerves
[B] Parasympathetic nerves
[C] Sympathetic nerves
[D] Cranial nerves
Show Answer
Correct Answer: C [Sympathetic nerves]
Notes:
Heart rate is controlled by the two branches of the autonomic (involuntary) nervous system. The sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). The sympathetic nervous system (SNS) releases the hormones (catecholamine – epinephrine) to accelerate the heart rate. The parasympathetic nervous system (PNS) releases the hormone acetylcholine to slow the heart rate.
