31. Which is the largest endocrine gland of the body?
[A] Thymus gland
[B] Pineal gland
[C] Thyroid gland
[D] Adrenal gland
Show Answer
Correct Answer: C [Thyroid gland]
Notes:
The thyroid gland is the largest endocrine gland in the body. These glands are found in front of the neck. It is found at the bottom of the throat, in the middle of the trachea.
32. Which of the following is the most fatal non-infectious disease?
[A] AIDS
[B] Cancer
[C] Diabetes
[D] Obesity
Show Answer
Correct Answer: B [Cancer]
Notes:
Cancer is the most fatal non-infectious disease. In cancer, some cells in the body grow uncontrollably and spread to other parts of the body.
33. Which of the following is totally impossible outcome of Mendel’s Experiment?
[A] 3 tall 1 short plant
[B] 24 tall and 8 short plants
[C] 8 tall and 0 short plants
[D] 4 tall plants and 1 medium height plant
Show Answer
Correct Answer: D [4 tall plants and 1 medium height plant]
Notes:
4 tall plants and 1 medium height plant is totally impossible outcome of Mendel’s Experiment. Gregor Mendel discovered the fundamental laws of inheritance through his work on pea plants. They concluded that genes come in pairs and are inherited as separate units, one from each parent.
34. Blue-green algae are included in the group ____:
[A] Protozoa
[B] Eubacteria
[C] Fungi
[D] Cyanobacteria
Show Answer
Correct Answer: D [Cyanobacteria]
Notes:
Cyanobacteria, also known as blue green algae, are single-celled and belong to the family of Prokaryotes. That means, they do not have a well defined cell nucleus. The ability of cyanobacteria to perform oxygenic photosynthesis is thought to have converted the early reducing atmosphere into an oxidizing one, which dramatically changed the composition of life forms on Earth by stimulating biodiversity and leading to the near-extinction of oxygen-intolerant organisms.
35. Bio-magnification implies ____:
[A] Food is magnified
[B] Living beings are magnified
[C] Light is magnified
[D] Toxic matters are magnified
Show Answer
Correct Answer: D [Toxic matters are magnified]
Notes:
Biomagnification is the sequence of processes in an ecosystem by which higher concentrations of a particular chemical such as the pesticide DDT, are reached in organisms higher up the food chain. It’s principal cause is eutrophication of stagnant water leading to the increase in BOD level. The some biomagnifcation has led to the ban on the use of DDT as a pesticide.
36. Element that is not found in blood is ___:
[A] Copper
[B] Iron
[C] Chromium
[D] Magnesium
Show Answer
Correct Answer: C [Chromium ]
Notes:
In the blood the key minerals are iron, copper, zinc, sodium, potassium, calcium and magnesium. Minerals constitute important part of blood plasma that constitutes almost 55% of blood. In the blood, iron is found in larger amounts than any other mineral.
37. The vector of disease sleeping sickness is ____:
[A] Sand fly
[B] House fly
[C] Fruit fly
[D] Tsetse fly
Show Answer
Correct Answer: D [Tsetse fly]
Notes:
Human African trypanosomiasis, sleeping sickness, African lethargy, or Congo trypanosomiasis is a parasitic disease of people and animals, caused by protozoa of the species Trypanosoma brucei and transmitted by the tsetse fly. The tsetse fly is a large, brown, biting fly that serves as both a host and vector for the trypanosome parasites.
38. Which chromosomal combination is responsible for maleness in man?
[A] XO
[B] XXX
[C] XX
[D] XY
Show Answer
Correct Answer: D [XY]
Notes:
The chromosomes which determine the sex (maleness or femaleness) of an individual in sexually producing organisms are called sex chromosomes or allosomes. In humans an individual whose cells contain XX chromosomes (homo or isogametic) becomes a female, while one whose cells contains XY chromosomes (heterogametic) becomes a male.
39. Eyes must be removed within ___ hours after the death for eye donation:
[A] 6
[B] 8
[C] 12
[D] 24
Show Answer
Correct Answer: A [6]
Notes:
Organ donation is the process of donating organs or biological tissue to a living recipient, who is in need of a transplant. The eyes of a dead person can be used only if they are taken out within 6 hrs of death. Only corneal blinds can be benefitted through this process not other Blinds.
40. 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.