Biology MCQs

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The female Anopheles mosquito distinguishes itself as both a parasite and vector host. It feeds on human blood, causing minor harm, hence proving its parasitic nature. And in its role as a vector, it allows the Plasmodium parasite, which is responsible for malaria, to mature and multiply inside its body before transmitting it to humans. Meanwhile, Ascaris lumbricoides and Fasciola hepatica act solely as parasites. House flies can serve as vectors, but are generally not classified as parasites.

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In most of the species, mitochondrial DNA is passed down from Mother.

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An important objective of biotechnology in the field of agriculture is to produce pest-resistant varieties of plants.

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The best food for the newborn baby is mother’s milk initial secretion call colostrum. Breast milk is free from contamination and adulteration and supplies necessary immunoglobulins and nutrients in almost correct amounts. It protects against allergies, sickness, and obesity. It protects against diseases, like diabetes and cancer. It protects against infections, like ear infections. It is easily digested – no constipation, diarrhea or upset stomach.

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Herbivorous animals have longer intestines than that of carnivorous animals. This is because their diet is grass and plants, made up of fibre and cellulose which are hard to digest. As a result, the herbivorous animals need a longer digestive track to digest their foods completely.

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Blood group AB individuals have both A and B antigens on the surface of their RBCs, and their blood plasma does not contain any antibodies against either A or B antigen. Therefore, an individual with type AB blood can receive blood from any group (with AB being preferable), but cannot donate blood to either A or B group. They are known as universal recipients.

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The average heart rate for adult humans is about 70 to 75 beats per minute in a normal relaxed mode. While we tend to think of the “normal” heart beat rate as being “72 beats per minute”, in actuality the heart beat rate is not and could never be constant.

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In an autosomal dominant disorder, the mutated gene is a dominant gene located on one of the nonsex chromosomes (autosomes). The early-onset form of Alzheimer disease is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. In most cases, an affected person inherits the altered gene from one affected parent.

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Virology is the branch of science that deals with the study of viruses. It focuses on the following aspects of viruses: their structure, classification and evolution, their ways to infect and exploit host cells for reproduction, their interaction with host organism physiology and immunity, the diseases they cause, and their use in research and therapy.

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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.