Biology MCQs

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Dirofilariasis is a disease caused by Dirofilaria worm infection. Dirofilaria immitis are also known as heartworm or dog heartworm.

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Ringworm or round red or silver type superficial fungal infections of the skin are caused by species of Trichophyton, Microsporum, and Epidermatophyton. There are dry scaly lesions on the skin, nails, and scalp that cause intense itching.

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Leber’s Hereditary Optic Atrophy is a type of Mitochondrial Inheritance that occurs due to mutations in a single gene and can be easily detected by pedigree analysis.

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Plant wilting occurs after excessive loss of water by transpiration and lesser absorption. i.e. rate of transpiration exceeds rate of water absorption. On a hot day, plants transpire heavily and cannot absorb water speedily to keep pace with transpiration loss, even when there is enough water.

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A scavenger is an organism that mostly consumes decaying biomass, such as meat or rotting plant material. Fungi are called as scavengers of earth as they decompose waste.

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Outer Ear or Pinna is found only in terrestrial mammals. It is composed of a thin plate of yellow elastic cartilage, covered with integument, and connected to the surrounding parts by ligaments and muscles.

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The cerebrum is the largest part of the human brain, making up about two-thirds of the brain’s mass. It has two hemispheres, each of which has four lobes: frontal, parietal, temporal and occipital. It is involved in several functions of the body including: determining intelligence; determining personality; thinking, perceiving, interpretation of sensory functions, etc.

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Vitamin B12 contains cobalt. Deficiency of Vitamin B12 causes pernicious anaemia and inflammation of tongue and mouth. Vitamin A, Vitamin C and Vitamin E are anti-oxidants.

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Olfactory receptor, also called smell receptor, are present in the nose. It is a protein capable of binding odour molecules that plays a central role in the sense of smell (olfaction). It is responsible for the detection of odorants which give rise to the sense of smell. Activated olfactory receptors trigger nerve impulses which transmit information about odour to the brain.

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In cabbage, the edible part is vegetative bud. Vegetative buds are buds from which vegetative parts like leaves and stems arise, rather than flowers. Enlarged buds or parts of buds form the edible portion of some horticultural crops. Cabbage and head lettuce are examples of unusually large terminal buds.