Biology MCQs

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Ovaries are the female reproductive organs that produce female gametes. It is also responsible for producing various hormones.

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Pulmonary Tuberculosis, Cholera, and Leprosy are bacterial diseases in Humans.

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A fungal skin infection that usually begins between the toes is called Athlete’s foot.

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Brinjal is the first GM crop in India. Genetically modified crops are plants used in agriculture and the DNA of which has been modified using genetic engineering methods.

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Flowers emit fragrance to attract pollinators which are mainly insects. The fragrance plays a prominent role in the localization and selection of flowers by insects, especially moth-pollinated flowers, which are detected and visited at night. If they have become infested with herbivores like caterpillars, they attract beneficial insects like parasitic wasps with the help of scent signals from their leaves.

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Abscisic acid also called plant stress hormone is responsible for responsible for dormancy of various types. It maintains dormancy in seeds and buds, stimulates the closing of stomata. Gibberellins are responsible for cell division and growth in cell size.

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Fermentation in food processing is the process of converting carbohydrates to alcohol or organic acids using microorganisms—yeasts or bacteria—under anaerobic conditions. It also occurs in oxygen-starved muscle cells, as in the case of lactic acid fermentation.

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Skeletal muscle is a form of striated muscle which is under the voluntary control of the somatic nervous system. Most skeletal muscles are attached to bones by bundles of collagen fibres known as tendons. It is one of three major muscle types, the others being cardiac muscle and smooth muscle.

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The best-known and most common chromosome abnormality in humans is Down’s syndrome, (Trisomy of 21st pair of chromosome). Down’s syndrome individuals also almost invariably develop Alzheimer’s disease, a form of dementia that is fairly common among the elderly people. People with Down’s syndrome develop this disease in their fourth or fifth decade of life, much sooner than other people. These people are also characterized by presence of webbed neck, Plamers crease, very broad forehead, round face and forked tongue.

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• Cerebellum is located under the cerebrum. Function: Coordinate muscle movements, maintain posture, and balance of the body.
• Cerebrum is the largest part of the brain. Function: Controls all our voluntary functions, as well as our thinking, vision, hearing etc.
• Pons is the largest part of the brainstem. Function: Sensory functions including arousal, respiratory processes, fine motor control, equilibrium, muscle tone, and the Circadian cycle.
• Medulla is the lowest part of the brainstem. Function: Relay of nerve signals between the brain and spinal cord, Coordination of body movements and Mood regulation.