31. Which of the following is used to absorb fluids and salts remaining after the completion of intestinal digestion and absorption and to mix its contents with a lubricating substance, mucus?
[A] Cecum
[B] Colon
[C] Rectum
[D] None of these
Show Answer
Correct Answer: A [Cecum]
Notes:
The cecum is used to absorb fluids and salts remaining after the completion of intestinal digestion and absorption and to mix its contents with a lubricating substance, mucus.
32. 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.
33. In which form does Plasmodium enter the human body?
[A] Phanerozoites
[B] Cryptozoites
[C] Gametocytes
[D] Sporozoites
Show Answer
Correct Answer: D [Sporozoites]
Notes:
In Sporozoites form of Plasmodium enter the human body through the bite of infected female Anopheles mosquitoes.
34. Golden rice variety is rich in which of the following?
[A] Vitamin C
[B] Β-carotene and ferritin
[C] Biotin
[D] Lysine
Show Answer
Correct Answer: B [Β-carotene and ferritin]
Notes:
The golden rice variety is rich in Β-carotene and ferritin. Beta carotene is a compound that gives vegetables their bright yellow, orange and red colours.
35. Which of the following is an important objective of biotechnology in the field of agriculture?
[A] to decrease seed number
[B] to produce pest-resistant varieties of plants
[C] to increase phosphorous, nitrogen production
[D] to reduce the number of plants
Show Answer
Correct Answer: B [to produce pest-resistant varieties of plants]
Notes:
An important objective of biotechnology in the field of agriculture is to produce pest-resistant varieties of plants.
36. What is Bt cotton?
[A] cloned plant
[B] transgenic plant
[C] hybrid plant
[D] mutated plant
Show Answer
Correct Answer: B [transgenic plant]
Notes:
Bt cotton is a transgenic plant. Plants in which one or more genes of another species have been introduced into the genome using genetic engineering procedures are called transgenic plants.
37. What is Alzheimer’s disease?
[A] It affects liver
[B] It is a disorder of the brain
[C] It affects kidney
[D] It affects human immune system
Show Answer
Correct Answer: B [It is a disorder of the brain]
Notes:
Alzheimer’s disease is a progressive neurologic disease of the brain leading to the irreversible loss of neurons and the loss of intellectual abilities, including memory and reasoning. These with time become severe enough to impede social or occupational functioning. Alzheimer’s disease is also known as simply Senile Dementia.
38. Which of the following brings back deoxygenated blood from different parts of human body to heart?
[A] Veins
[B] Arteries
[C] Nerves
[D] Lungs
Show Answer
Correct Answer: A [Veins]
Notes:
Veins carry the deoxygenated blood from different parts of the body to the heart. There are two main veins that carry out this job. The superior vena cava carries deoxygenated blood from head, neck, thorax and hands to the right atrium of our heart. The inferior vena cava carries deoxygenated blood from legs, pelvic region and abdominal organs to the right atrium of our heart. Among the veins, only pulmonary vein carries oxygenated blood.
39. Blood is a connective tissue embedded in which type of intercellular matrix?
[A] Jelly like
[B] Fluid
[C] Dense
[D] None of the above
Show Answer
Correct Answer: B [Fluid]
Notes:
Blood is a fluid connective tissue. It has two components: cells and fluid matrix in which it is embedded. The liquid matrix is known as the plasma, in which blood cells are present. Blood travels all around the body in specialized blood vessels.
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.
