Biology MCQs

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Inputs of photosynthesis are carbon dioxide and water and outputs are glucose and oxygen. Photosynthesis occurs in the presence of sunlight.

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Hypothalamus acts as the thermostat of human body as it regulates the body temperature as the same way a thermostat controls the room temperature. It is located in the skull of the human body.

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Heart has four chambers, left & right ventricles and left & right atria which are synchronized to act together. A condition in which synchronizm does not take place is know as fibrillation. Fibrillation of atrial muscles is called as atrial fibrillation, fibrillation of the ventricular muscles is termed as ventricular fibrillation. In atrial fibrillation the ventricles functions normally, but respond with an irregular rhythm. In atrial fibrillations circulation is maintained, although not as efficiently. Ventricular fibrillation is more dangerous, as the ventricle are unable to pump the blood. There are many methods of correcting fibrillation mechanically, includingA.C. defibrillation & D.C. defibrillation. (Source: The Hindu Speaks on Science). Kindly read about working of Human Heart, particularly, how blood passes in 4 different parts of Human heart.

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Mammology is a branch of biology that deals with the study of mammals.

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Albert Szent-György is the scientist who discovered Vitamin C. Vitamin C is a water-soluble vitamin. The chemical name is Ascorbic acid.

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Adult humans have an average of about 25 trillion RBCs in their bodies. Women usually have fewer RBCs than men

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Vascular tissue is completely absent in bryophytes. Water and nutrients enter the cells by diffusion. And vascular tissue in rhodophytes consists of xylem and phloem.

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Equisetum is an example of pteridophytes. Hornworts, liverworts, and mosses are all examples of bryophytes. Cycas, pinus, Thuja, Cedrus, Abies, Larix are some of the examples of gymnosperms.

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Unifoliate leaves are composed of a single leaflet. This term is particularly used in botany to describe types of leaves, where ‘uni’ stands for one. The citrus plant is a good example of a unifoliate structure. Other terms like bifoliate, trifoliate, and multifoliate refer to leaves with two, three, or more leaflets respectively, indicating the complexity of leaf structure in diverse plant species.

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The rate of photosynthesis mainly depends on the Intensity of Light, carbon dioxide concentration, and temperature.