Biology MCQs

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Mycobacterium avium microorganism causes a bacterial disease in a poultry farm.

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A renewable, biodegradable fuel that is manufactured from vegetable oils and animal fats are called Biodiesel

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A chromosome contains the specific DNA sequence, called the origin of replication, which is responsible for initiating replication. DNA ligase is an enzyme. It helps in binding the DNA. Termination sequence is the site where DNA replication ends while histones are the proteins around which DNA is wound.

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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 Eustachian Tube is a tube that links the nasopharynx to the middle ear. It is a part of the middle ear. It help to maintain air pressure of body with respect to atmospheric air pressure. It’s also because of this people flying by air feel pain in their ears when flying for long hours together.

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The respiratory bronchioles are the narrowest airways of the lungs, one fiftieth of an inch across. The bronchi divide many times before evolving into the bronchioles. The bronchioles deliver air to the exchange surfaces of the lungs.

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Cellulose is an important structural component of the primary cell wall of green plants, many forms of algae and the oomycetes. It is a complex carbohydrate, (C6H10O5)n, that is composed of glucose units.

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The Malabar Grey Hornbill is a hornbill that is endemic to the Western Ghats and associated hills of southern India. They are found mainly in dense forest and around rubber or coffee plantations.

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During the day when stomata are open, the transpiration pull becomes a major driving force in the movement of water in the xylem. Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. Water is necessary for plants but only a small amount of water taken up by the roots is used for growth and metabolism. The remaining 97–99.5% is lost by transpiration and guttation.

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By far the most important microscopic decomposers are bacteria, which do the lion’s share of decomposition in the compost heap. The microbial organisms transform the substance through metabolic or enzymatic processes. It is based on two processes: growth and cometabolism. In growth, an organic pollutant is used as sole source of carbon and energy. This process results in a complete degradation (mineralization) of organic pollutants. But there are other microscopic creatures such as actinomycetes, fungi, and protozoa, that also play an important role.