Biology MCQs

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The law of segregation states that allelomorphs do not and do not lose their identity, but as long as they separate into different gametes, they remain together until the formation of gametes. There is no law of recurring; This is just part of the law of dominance.

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A gene that has the potential to cause cancer is called an oncogenic trait.

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Mycorrhiza is a symbiotic association between fungi and roots of higher plants. A non-disease-producing association in which the fungus invades the root to absorb nutrients is called Mycorrhiza.

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The major role of epidermis is to protect all the parts of the plant. Epidermal cells on the aerial parts of the plant often secrete a waxy, water-resistant layer on their outer surface. This aids in protection against loss of water, mechanical injury and invasion by parasitic fungi.

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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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Monotremes are mammals that lay eggs instead of giving birth to live young like marsupials and placental mammals. Among living mammals they include the platypus and four species of echidnas (or spiny anteaters).

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Red rot is one of the oldest known diseases of sugarcane that is caused by the fungus Colletotrichum falcatum (Glomerella tucumanensis). It is characterized by interrupted red and white patches within the cane along with a sour alcoholic odour when the cane is split open.

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Hibernation is a state of inactivity and metabolic depression in endotherms. Hibernation refers to a season of heterothermy that is characterized by low body temperature, slow breathing and heart rate, and low metabolic rate. Often associated with cold temperatures, the purpose of hibernation is to conserve energy during a period when sufficient food is scarce and outside temperature is low.

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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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Pancreatic juice is a liquid secreted by the pancreas that consists of water, sodium salts and enzymes such as Amylopsin, Trypsin and Stepsin. Sodium carbonate creates an alkaline medium for its action. Bicarbonate is useful in neutralizing the acidic gastric acid, allowing for effective enzymic changes.