Free Biodiversity and Variety of Life MCQs with Answers
3,130 Biodiversity and Variety of Life MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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- A. Syphilis, Treponema pallidum
- B. AIDS, Bacillus conjugalis
- C. Gonorrhoea, Leishmania donovani
- D. Typhoid, Mycobacterium leprae
Explanation: Syphilis is caused by a spirochete (spiral bacterium) called Treponema pallidum. The symptoms of syphilis occur in three stages.
Correct answer: Syphilis, Treponema pallidum- A. Encephalitis
- B. Jakob Cruetzfeldt disease
- C. Spongiocitis of cerebrum
- D. Spondylitis
Explanation: The common term for bovine spongiform encephalopathy is mad cow disease, which is a progressive neurological disorder in cattle.
Correct answer: Jakob Cruetzfeldt disease- A. Na+ prevents water loss from body
- B. NaCl function as regulatory material
- C. NaCl produces energy
- D. NaCl is antibacterial
Explanation: Cholera is an acute infection of the small intestine caused by the bacterium Vibrio cholerae, resulting in severe vomiting and diarrhea…
Correct answer: Na+ prevents water loss from body- A. Proteins
- B. Carbohydrates
- C. Lipids
- D. Germs
Explanation: Antibodies are members of a class of proteins known as immunoglobulins.
Correct answer: Proteins- A. Increasing rate of heart beat
- B. Increasing quantity of blood
- C. Resistance developed after disease
- D. Resistance developed before disease
Explanation: Active immunity is the immune response generated in an individual due to contact with an infectious pathogen or vaccination.
Correct answer: Resistance developed after disease- A. Shigella
- B. Escherichia
- C. Giardia
- D. Salmonella
Explanation: Typhoid is caused by Salmonella typhi. The organisms of the disease are present in the stool, and they may also be found in urine.
Correct answer: Salmonella- A. Lymph glands
- B. Central nervous system
- C. Spleen
- D. Intestine
Explanation: Clostridium is a genus of gram-positive bacteria. They are obligate anaerobes capable of producing endospores.
Correct answer: Central nervous system- A. Amphetamines
- B. LSD
- C. Barbiturates
- D. Morphine
Explanation: Opiates are derived from opium along with their synthetic relatives. Opiates have narcotic, analgesic, sedative, and astringent effects.
Correct answer: Morphine- A. Tuberculosis
- B. Cancer
- C. Poliomyelitis
- D. None of these
Explanation: Cancer may be curable in the next two decades. The completion of the human genome is causing profound changes in the thinking and…
Correct answer: Cancer- A. Nematodes
- B. Bacteria
- C. Virus
- D. None of these.
Explanation: Diphtheria is caused by Corynebacterium diphtheriae, a type of bacteria that usually affects children up to the age of five.
Correct answer: Bacteria- A. Small pox
- B. Poliomyelitis
- C. Plague
- D. Kala-azar
Explanation: Smallpox is an acute, highly communicable disease caused by the Variola virus. It has been eradicated worldwide, including in India.
Correct answer: Small pox- A. Nausea and Loss of hair
- B. Ulcerated skin, Nausea and Loss of hair
- C. Red and Ulcerated skin
- D. Nausea and Anaemia
Explanation: Pellagra, also known as red sickness, is a vitamin deficiency disease caused by a chronic lack of Vitamin B3 in the diet.
Correct answer: Ulcerated skin, Nausea and Loss of hair- A. Tetanus
- B. Malaria
- C. Typhoid .
- D. Measles
Explanation: Interferons are antiviral proteins that increase a cell's resistance to viral attacks.
Correct answer: Measles- A. Rabies, Mumps
- B. Cholera, Tuberculosis
- C. Typhoid, Tetanus
- D. AIDS, Syphilis
Explanation: Mumps is an infectious disease that causes fever, difficulty in opening the mouth, and painful swelling of the parotid glands, which lie…
Correct answer: Rabies, Mumps- A. Leucocytes
- B. Monocytes
- C. Lymphocytes
- D. Spleen
Explanation: Lymphocytes secrete antibodies to destroy microbes and their toxins, reject grafts, and kill tumor cells.
Correct answer: Lymphocytes- A. Antigen proteins
- B. Antiviral proteins
- C. Antibiotic proteins
- D. All of these.
Explanation: Interferons are proteins that increase the resistance of a cell to attack by viruses by unmasking genes that synthesize antiviral…
Correct answer: Antiviral proteins- A. Some persons have allergy from antibiotics
- B. Antibiotics are capable of curing any disease
- C. This term was given by Waksman in 1942
- D. Antibiotics is produced by microorganisms
Explanation: Lymphocytes secrete antibodies to combat microbes and their toxins, reject grafts, and eliminate tumor cells.
Correct answer: Antibiotics are capable of curing any disease- A. Testosterone
- B. Dopamine
- C. Thyroxine
- D. Acetylcholine
Explanation: Nicotine is the major stimulatory component of tobacco products including cigarettes.
Correct answer: Acetylcholine- A. Haemolysis
- B. Haemophilia
- C. Leukaemia
- D. Thrombosis
Explanation: The normal white blood cell (WBC) count ranges from 5,000 to 10,000 per cubic millimeter of blood.
Correct answer: Leukaemia- A. Syphilis; Trichuris trichiura
- B. Sleeping sickness; Trypanosoma gambiense
- C. Dengue fever; Arbovirus
- D. Plague; Yersinia pestis
Explanation: Syphilis is caused by a spirochete (spiral bacterium) called Treponema pallidum.
Correct answer: Syphilis; Trichuris trichiura