Biology MCQs
31. Which of the following are examples of hydrophilic molecules?
[A] sugar
[B] cellulose
[C] starch
[D] All of the above
[B] cellulose
[C] starch
[D] All of the above
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.
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.
32. Typhoid fever is caused by ____:
[A] Virus
[B] Bacteria
[C] Fungus
[D] Allergy
[B] Bacteria
[C] Fungus
[D] Allergy
Correct Answer: B [Bacteria]
Notes:
Typhoid fever, also known as typhoid, is a common water borne worldwide bacterial disease, transmitted by the ingestion of food or water contaminated with the feces of an infected person, which contain the bacterium Salmonella Typhi.
Typhoid fever, also known as typhoid, is a common water borne worldwide bacterial disease, transmitted by the ingestion of food or water contaminated with the feces of an infected person, which contain the bacterium Salmonella Typhi.
33. Which angiosperm is vesselless?
[A] Maize
[B] Trochodendron
[C] Hydrilla
[D] Wheat
[B] Trochodendron
[C] Hydrilla
[D] Wheat
Correct Answer: B [Trochodendron]
Notes:
Trochodendron is a genus of flowering plants with one living species. It is vesselless angiosperm. Fewer than 200 species of angiosperms have the primitive feature of vesselless wood. With two exceptions— Trochodendron and Tetracentron; all vesselless angiosperms occur in the Magnolidae.
Trochodendron is a genus of flowering plants with one living species. It is vesselless angiosperm. Fewer than 200 species of angiosperms have the primitive feature of vesselless wood. With two exceptions— Trochodendron and Tetracentron; all vesselless angiosperms occur in the Magnolidae.
34. Which of the following processes are associated with plants during dark period?
[A] Respiration and transpiration
[B] Transpiration and conduction
[C] Photosynthesis and respiration
[D] Conduction and respiration
[B] Transpiration and conduction
[C] Photosynthesis and respiration
[D] Conduction and respiration
Correct Answer: D [Conduction and respiration]
Notes:
Conduction is the process by which vital nutrients are transported to the different parts of a plant. This process is independent of the light factor. Respiration process in plants is the intake of carbon-dioxide and exhales oxygen during the day as the plants gets energy through the photosynthesis process in which the carbon-dioxide is converted into sugars using the sun light energy, as this process uses carbon-dioxide and water, the resulting gas oxygen is given out as a waste product. During the night, as the photosynthesis process does not take place it exhales the carbon-dioxide itself.
Conduction is the process by which vital nutrients are transported to the different parts of a plant. This process is independent of the light factor. Respiration process in plants is the intake of carbon-dioxide and exhales oxygen during the day as the plants gets energy through the photosynthesis process in which the carbon-dioxide is converted into sugars using the sun light energy, as this process uses carbon-dioxide and water, the resulting gas oxygen is given out as a waste product. During the night, as the photosynthesis process does not take place it exhales the carbon-dioxide itself.
35. Which one of the following is not a true fish?
[A] Jellyfish
[B] Starfish
[C] Cuttlefish
[D] All of the above
[B] Starfish
[C] Cuttlefish
[D] All of the above
Correct Answer: D [All of the above ]
Notes:
The term fish is most strictly used to describe any animal with a backbone that has gills throughout life and has limbs, if any, in the shape of fins. Many types of aquatic animals commonly referred to as fish are not fish in this strict sense; examples include shellfish, cuttlefish, starfish, crayfish and jellyfish.
The term fish is most strictly used to describe any animal with a backbone that has gills throughout life and has limbs, if any, in the shape of fins. Many types of aquatic animals commonly referred to as fish are not fish in this strict sense; examples include shellfish, cuttlefish, starfish, crayfish and jellyfish.
36. Which of the following increases the rate of heart beat?
[A] Peripheral nerves
[B] Parasympathetic nerves
[C] Sympathetic nerves
[D] Cranial nerves
[B] Parasympathetic nerves
[C] Sympathetic nerves
[D] Cranial nerves
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.
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.
37. Clitellum is found in ____:
[A] Leech
[B] Snail
[C] Nereis
[D] Earthworm
[B] Snail
[C] Nereis
[D] Earthworm
Correct Answer: D [Earthworm]
Notes:
The clitellum is a thickened glandular and non-segmented section of the body wall near the head in earthworms and leeches, that secretes a viscid sac in which the eggs are deposited. Its main function is to store the eggs of the earthworm.
The clitellum is a thickened glandular and non-segmented section of the body wall near the head in earthworms and leeches, that secretes a viscid sac in which the eggs are deposited. Its main function is to store the eggs of the earthworm.
38. Yeast is a ____:
[A] Bacteria
[B] Fungi
[C] Algae
[D] Bryophyte
[B] Fungi
[C] Algae
[D] Bryophyte
Correct Answer: B [Fungi]
Notes:
Yeast are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. They are estimated to constitute 1% of all described fungal species. Yeasts, such as Candida albicans, are opportunistic pathogens and can cause infections in humans. Commercially they are widely used in production of alcohol and carbon dioxide. Hence, they are known to lay foundation of bakery and brewery industries.
Yeast are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. They are estimated to constitute 1% of all described fungal species. Yeasts, such as Candida albicans, are opportunistic pathogens and can cause infections in humans. Commercially they are widely used in production of alcohol and carbon dioxide. Hence, they are known to lay foundation of bakery and brewery industries.
39. The ‘DPT vaccine’ is given to young babies to protect them from ____:
[A] Diphtheria, Polio and Tetanus
[B] Diphtheria, Pneumonia and Tuberculosis
[C] Diphtheria, Smallpox and Tetanus
[D] Diphtheria, Whooping cough and Tetanus
[B] Diphtheria, Pneumonia and Tuberculosis
[C] Diphtheria, Smallpox and Tetanus
[D] Diphtheria, Whooping cough and Tetanus
Correct Answer: D [Diphtheria, Whooping cough and Tetanus]
Notes:
DPT refers to a class of combination vaccines against three infectious diseases in humans: diphtheria, pertussis (whooping cough) and tetanus. The vaccine components include diphtheria and tetanus toxoids, and killed whole cells of the organism that causes pertussis.
DPT refers to a class of combination vaccines against three infectious diseases in humans: diphtheria, pertussis (whooping cough) and tetanus. The vaccine components include diphtheria and tetanus toxoids, and killed whole cells of the organism that causes pertussis.
40. Approximate life span of parrot is ____:
[A] 20 years
[B] 40 years
[C] 70 years
[D] 140 years
[B] 40 years
[C] 70 years
[D] 140 years
Correct Answer: A [20 years]
Notes:
The life span of a parrot depends on the species. Smaller types of parrots generally have a life span of 15 to 20 years, while some larger varieties can live up to 120 years. The amount of time that a parrot lives greatly depends on its species, level of care, and overall health. It is not a rare occurrence for a pet parrot to outlive its owner.
The life span of a parrot depends on the species. Smaller types of parrots generally have a life span of 15 to 20 years, while some larger varieties can live up to 120 years. The amount of time that a parrot lives greatly depends on its species, level of care, and overall health. It is not a rare occurrence for a pet parrot to outlive its owner.
