Biology MCQs

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The oviduct is the passage in animals from an ovary. Fallopian tubes, are also known as oviducts or uterine tubes.

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Human sperm moves with the help of the Flagellum. The flagellum is primarily a motility organ that enables movement and chemotaxis.

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The earliest recorded pandemic – the Black Death – was thought to be a plague.

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Hemophilia A is characterized by a deficiency of the anti-hemophilia globulin factor.

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Cystic Fibrosis is an Autosomal recessive disorder that causes severe damage to the lungs, digestive system, and other organs in the body

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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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Most cases of filariasis are caused by the parasite known as Wuchereria bancrofti. A wide range of mosquitoes can transmit this parasite, depending on the geographic area. In Africa, the most common vector is Anopheles while in the Americas, it is Culex quinquefasciatus. Aedes and Mansonia transmits transmit the infection in the Pacific and in Asia. Thus, Culex, Aedes and Anopheles mosquitoes serve as vector for W. bancrofti in transmission of the disease. Aedes mosquito causes dengue fever. Anopheles mosquito causes malaria. Culex mosquito causes filaria. A wide range of mosquitoes can transmit the parasite, depending on the geographic area. In Africa, the most common vector is Anopheles and in the Americas, it is Culex quinquefasciatus. [This question was wrongly framed in exam as “filaria is caused by__:”. GKtoday has edited it to make it correct.]

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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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Cause of night blindness is a deficiency of retinol, or vitamin A, found in fish oils, liver, dairy products, vegetable and fruits yellow in colour. Nyctalopia also called “Night Blindness” is a condition making it difficult or impossible to see in relatively dim light. To over come deficiency of vitamin-A, one needs to feed of food products rich in carotene which is used in synthesis of vitamin-A is liver.

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Thigmonasty (thigmotropism) refers to plant movement in response to touch or physical contact without regard to the direction of the stimulus. Thigmonastic movements are exemplified by the closing of the insect-eating plant Venus’s flytrap (Dionaea muscipula) and the bending of the glandular hairs of sundew (Drosera sp.) as a result of contact with an insect.