Biology MCQs

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Lymphocytes are a type of white blood cell that are part of the immune system. Their main function is to produce antibodies that protect the body from foreign invaders, such as viruses, bacteria, and toxins. These antibodies help the body respond to and eliminate foreign invaders, which provides protection against infectious diseases.
Lymphocytes also help the body’s immune system remember every antigen it comes in contact with. After an encounter, some lymphocytes turn into memory cells.
There are two main types of lymphocytes: B cells and T cells. B cells produce antibodies that attack invading bacteria, viruses, and toxins. T cells destroy the body’s own cells that have been taken over.
If you have low numbers of lymphocytes (lymphopenia), you are at higher risk of infection. Symptoms can range from mild to serious and are correlated to the severity of the lymphopenia as well as its duration. Some people have no symptoms.

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Amflora which is also known as EH92-527-1 is a genetically modified potato cultivar developed by BASF Plant Science. It is developed to produce a specific natural starch (amylopectin) needed for industrial applications.

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Tocopherols are a class of organic chemical compounds, many of which have vitamin E activity. Deficiency of Tocopherol leads to sterility in males and females. Tocopherol exists in four different forms designated as α, β, δ, and γ.

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Cloves are aromatic dried flower buds of a tree. Cloves are native to Indonesia and used as a spice in cuisines all over the world. Cloves are now harvested primarily in Indonesia, Madagascar, Zanzibar, Pakistan, and Sri Lanka; they are also grown in India under the name Lavang.

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Calcium is required in plants in the formation of cell wall. It is a structural layer surrounding some types of cells, just outside the cell membrane. The cell wall can be tough, flexible, and sometimes rigid also.

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Bryophytes are an informal group consisting of three divisions of non-vascular land plants: the liverworts, hornworts and mosses. They play a vital role in regulating ecosystems because they provide an important buffer system for other plants.

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Cornea does not have blood vessels. It is the transparent part of the eye that covers the front portion of the eye. It covers the pupil, iris, and anterior chamber.

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White-nose syndrome (WNS) is an emergent disease of hibernating bats that has spread from the north-eastern to the central United States at an alarming rate.

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Taenia is a taxonomic rank of tapeworm (helminth) that includes some main parasites of livestock. There are more than 100 species of Taenia. Taenia is responsible for taeniasis and cysticercosis in humans. They are morphologically characterized by a ribbon like body composed of a series of segments called proglottids.

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A single gene may have two or more phenotypic expressions or characters. The multiple phenotypic effect of a single gene is called pleiotropism. Hence the gene associated with this phenomenon is called Pleiotropic gene.