Biology MCQs

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Vitamin B is involved in the breakdown of energy molecules such as glucose. Vitamin B are a class of water-soluble vitamins which play an important role in cell metabolism.

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Biologists have been able to demonstrate the hearing and sound sensory mechanism through the acoustico-lateralis system in fishes.

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Pyloric sphincter is located between Stomach and duodenum. It is a small piece of smooth visceral muscle which acts as a valve and regulates the flow of partially digested food from the stomach to the duodenum.

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A treatment with abscisic acid would prevent water loss from the plant leaves, by reducing transpiration, in times of low water availability.

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Most of the essential micronutrients are almost exclusively stored in the husk, aleurone and embryo of rice, which are removed during the polishing process. Polishing of rice is required as the oil-rich aleurone layer turns the seed rancid upon storage and therefore making rice unsuitable for consumption. Consequently, the rice endosperm that comprises the edible part of rice for humans lacks or contains only small amount of key micronutrients (e.g., iron, zinc, protein, provitamin A, and other vitamins) that are essential for a healthy diet. Considering the facts above and severity of widespread micronutrient malnutrition, iron biofortification in rice endosperm is a promising strategy to overcome iron deficiency effectively.

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A Xerophyte is a species of plant that has adapted to survive in an environment with little liquid water, such as a desert or an ice- or snow-covered region in the Alps or the Arctic.

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Ribonucleic acid (RNA) is a polymeric molecule essential in various biological roles in coding, decoding, regulation and expression of genes. An example of RNA is a chain of cells that carries genetic information of many viruses from the cell to the cytoplasm.

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Adrenaline, also known as epinephrine, is a hormone, neurotransmitter, and medication. Adrenaline is normally produced by both the adrenal glands and certain neurons.

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Biogas or Gobar gas is produced by the breakdown of organic matter in the absence of oxygen. It can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste. It is a renewable energy source. It comprises primarily methane (CH4) and carbon dioxide (CO2) and may have small amounts of hydrogen sulphide (H2S), moisture and siloxanes. It is produced by anaerobic digestion.

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The hypothalamus part of the brain works with other parts of the body’s temperature-regulating system, such as the skin, sweat glands and blood vessels. Water evaporating from the skin cools the body, keeping its temperature in a healthy range.