Biology MCQs

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2 ureters are present. One from each kidney. The upper half is located in the abdomen and the lower half is located in the pelvic region.

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Vagina > Cervix > Uterus > Oviduct is the correct order of travel of sperm through the female reproductive tract before it reaches the egg.

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Flavr savr is a transgenic tomato variety that has a better shelf life and was the first GM food crop to be used commercially.

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Fluorine is the element that is associated with teeth disorder because the presence of sodium fluoride in drinking water at the level of 2ppm may cause mottled enamel in teeth, skeletal fluorosis, and may be associated with cancer and other diseases. However, topically applied fluoride (toothpaste, dental rinses) has been shown to help reduce dental caries.

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Somatosensory Receptor refers to a cell or group of cells specialized to detect changes in the environment and trigger impulses in the sensory nervous system. They are specialized to respond to a particular physical property, such as “touch,” “light,” or “temperature.” The somatosensory system is a part of the sensory nervous system.

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Human African trypanosomiasis, sleeping sickness, African lethargy, or Congo trypanosomiasis is a parasitic disease of people and animals, caused by protozoa of the species Trypanosoma brucei and transmitted by the tsetse fly. The tsetse fly is a large, brown, biting fly that serves as both a host and vector for the trypanosome parasites.

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Tusks are elongated, continuously growing front teeth (incisors) usually but not always in pairs, that protrude well beyond the mouth of certain mammal species. They are most commonly canines, as with warthogs, pig, and walruses but in the case of elephants, elongated incisors. In most tusked species both the males and the females have tusks although the males’ are larger.

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The Venus flytrap (Dionaea muscipula) is a carnivorous plant native to subtropical
wetlands on the East Coast of the United States in North Carolina and South Carolina. It catches its prey chiefly insects and arachnids with a trapping structure formed by the terminal portion of each of the plant’s leaves, which is triggered by tiny hairs on their inner surfaces.

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Parenchyma cells containing ergastic substances are called idioblasts. Tannin cells, cells filled with raphides, etc. constitute idioblast. An idioblast is an isolated plant cell that differs from neighboring tissues. It carries out storage of reserves in form of fats or oils wastes.

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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.