Free Biodiversity and Variety of Life MCQs with Answers

• A. IgA
• B. IgG
• C. IgD
• D. IgM

Explanation: IgA immunoglobulins are the second most abundant class of immunoglobulins, which are mainly found in sweat, tears, saliva, mucus…

• A. Babesiosis
• B. Blastomycosis
• C. Syphilis
• D. Influenza

Explanation: Babesiosis is a malaria-like parasitic disease caused by infection with Babesia, a parasitic protozoan.

• A. Passive immune response
• B. Innate immune response
• C. Humoral immune response
• D. Cell-mediated immune response

Explanation: Cell-mediated immune response(CMIS) consists of T-lymphocytes. It reacts against transplants.

• A. Food in intestine
• B. Blood only
• C. Erythrocytes, mucosa and submucosa of the colon
• D. Mucosa and submucosa of colon only

Explanation: Entamoeba histolytica(Gr., entos: within+amoeba: change+histones: tissue + lysis: dissolve) is the causative organism of amoebic dysentery…

• A. Helper T lymphocytes
• B. Thrombocytes
• C. B lymphocytes
• D. Leucocytes

Explanation: The AIDS retrovirus, called human immunodeficiency virus(HIV), mounts a direct attack on CD4 + T-helper cells because it recognizes the…

• A. Hallucinogen
• B. Depressant
• C. Stimulant
• D. Pain killer

Explanation: The plant illustrated in the diagram is Datura. It is a genus of flowering plants in the family Solanaceae.

• A. Within 15 days of sexual contact with an infected person
• B. When the infected retro virus enters host cells
• C. When HIV damages a large number of helper T-lymphocytes
• D. When the viral DNA is produced by reverse transcriptase

Explanation: AIDS is a disorder of the cell-mediated immune system of the body. The virus responsible for AIDS is HIV(Human immunodeficiency virus).

• A. Tsetse fly
• B. Mosquito bite
• C. Drinking water containing eggs of Ascaris
• D. Eating imperfectly cooked pork

Explanation: Man acquires infection of Ascaris by directly ingesting Ascaris eggs, containing the infective second-stage larva, with contaminated food…

• A. Muscles of the legs
• B. Blood vessels of the thigh region
• C. Skin between the fingers
• D. Lymphatic vessels of the lower limbs

Explanation: Wuchereria bancrofti is a dreaded human parasite. It is a digenetic parasite completing its life cycle in two hosts the final host is man…

• A. Caffeine
• B. Morphine
• C. Lysergic acid diethylamide
• D. Opium

Explanation: LSD is a psychedelic drug since it causes optical and auditory hallucinations and induces behavioral abnormalities.

• A. Gut of female Anopheles
• B. Salivary glands of Anopheles
• C. Human RBCs
• D. Human liver

Explanation: Plasmodium, a tiny protozoan parasite causes malaria in humans and is transmitted through the bite of an infected female Anopheles…

• A. They compete with normal cells for vital nutrients
• B. They do not remain confined in the area of formation
• C. They divide in an uncontrolled manner
• D. They show contact inhibition

Explanation: Contact inhibition is a property of normal cells by virtue of which contact withother cells inhibits their uncontrolled growth.

• A. Opium
• B. Alcohol
• C. Tobacco(chewing)
• D. Cocaine

Explanation: Cirrhosis is a condition in which the liver responds to injury or death of some of its cells by producing interlacing strands of fibrous…

• A. Saliva of infected female Anopheles mosquito
• B. Red blood corpuscles of human suffering from malaria
• C. Spleen of infected humans
• D. Salivary glands of freshy moulted female Anopheles mosquito

Explanation: Sporozoites represent the infective forms of malarial parasites. A healthy person acquires infection, when a female Anopheles mosquito…

• A. Caused by a virus
• B. Caused by a Gram positive bacterium
• C. Caused by a Gram negative bacterium
• D. Not an infectious disease

Explanation: Common cold is caused by some 100 types of Rhinoviruses. It is one of the most common infectious diseases in humans.

• A. Bacteria
• B. Fungi
• C. Nematodes
• D. Viruses

Explanation: Ringworm (tinea) is a fungal infection of the skin, the scalp, or the ails.

• A. Malaria
• B. Pneumonia
• C. Tuberculosis
• D. Typhoid.

Explanation: Widal test (developed by G.F.I Widal) is an agglutination test for the presence of antibodies against the Salmonella organism that causes…

• A. Gemini viruses
• B. Prions
• C. Viroids
• D. Satellite viruses.

Explanation: Prions are named by Stanley Prusiner (who got the Nobel Prize in 1997).

• A. Magnetic Resonance Imaging (MRI)
• B. Radiography (X-Ray)
• C. Computed tomography (CT)
• D. Histopathological studies

Explanation: The histopathological study is an invasive technique. Radiography and CT involve X-rays which are harmful.

• A. The sporozoites released from RBCs are being rapidly killed and broken down inside spleen
• B. The trophozoites reach maximum growth and give out certain toxins
• C. The parasite after its rapid multiplication inside RBCs ruptures them, releasing the stage to enter fresh RBCs
• D. The microgametocytes and megagametocytes are being destroyed by the WBCs.

Explanation: Plasmodium is a tiny protozoan that is responsible for malaria in humans.