Biology MCQs

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Into three structural regions is the oviduct divided: ampulla, isthmus, and infundibulum

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Hybrid poplar and willow algae are energy crops. These can be used as biomass. Trap grease belongs to urban waste which can be used as biomass. Iron nails are not biomass.

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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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Creatinine is a chemical waste molecule that is generated during muscle metabolism. It is transported through the bloodstream to the kidneys. The kidneys filter out most of the creatinine and dispose it off in the urine. High levels of creatinine indicates of possible malfunction or failure of the kidneys. The presence of any type of blood cells as deducted by KFT (Kidney Functional Test) directly indicate the severe state of kidney functioning.

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Bicuspid valve is located between the left atrium and left ventricle. The mitral valve is also called the bicuspid valve because it contains two leaflets or cusps. It is on the left side of the heart and allows the blood to flow from the left atrium into the left ventricle.

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Haemoglobin is the iron-containing oxygen-transport metaloprotein in the red blood cells. It is responsible for binding oxygen in the lung and transporting the oxygen throughout the body to be used up in aerobic metabolic pathways.

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Gymnosperm are flowerless plant that produces cones and seeds. The term gymnosperm literally means “naked seed”, as gymnosperm seed are not encased within an ovary. Rather they sit exposed on the surface of the leaf like structures called bracts.

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Zika virus (ZIKV) is a member of the virus family Flaviviridae. It is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.

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Alveoli are the small balloon-like sacks of 200– 500 ?m diameter, making up a vital part of the respiratory zone of the lungs. Each alveolus (singular) plays an important role in letting oxygen and carbon dioxide move into and from the blood stream during inhalation and exhalation. he balloon-shaped alveoli cover approximately 70 square meter area within the lungs, with this wide surface area contributing towards a more efficient gas exchange.

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Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies. The gelling agent in agar is an unbranched polysaccharide obtained from the cell walls of Gelidium and Gracilaria. For commercial purposes, it is derived primarily from Gelidium amansii. In chemical terms, agar is a polymer made up of subunits of the sugar galactose.