Biology MCQs

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A goitre which is also called a bronchoce is a swelling in the neck. It is commonly developed as a result of iodine deficiency or the inflammation of the thyroid gland.

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Encephalitis is an inflammation of the brain tissue. The most common cause is viral infections which is caused by bacteria or even fungi. There are two main types of encephalitis: primary Encephalitis and secondary Encephalitis.

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Bt cotton is an insect-resistant transgenic crop designed to combat the bullworm. Bt is a soil bacterium containing Cry genes that encode crystal proteins which are fatal to some Lepidopteran caterpillars when ingested.

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The breathing rate is controlled by the medulla in the brain, which is primarily sensitive to CO₂ levels in the blood.

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Seals, Walruses and Sea lions are Mammals belonging to a single taxonomic group ( a clade) called Pinnipedia, which means fin footed. All of them are semi-aquatic marine mammals. They belong to the order Carnivora and their closest living relatives are bears. They are characterized by modification of limbs to flippers. Pinnipeds are mammals with four flippers — one pair in front and one at the back. They are warm-blooded, nurse their young, breathe air and have hair. The sea lion has small, tiny external ear flaps. Seals have no flaps. The front flippers of sea lions are long, have no hair and nails. Seals’ front flippers are short, blunt, covered with hair with nails on the ends. Sea lions can turn their hind flippers forward to move on land but seals cannot do so.

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Alec Jeffery is known as the father of Finger Printing Technique. H. Morgan is known as the Father of Experimental Genetics. Bateson is known as the Father of modern Genetics. Hugo de Vries Father of Mutation theory of evolution.

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Wilhelm Johannsen was a Danish botanist, plant physiologist, and geneticist. He is best known for coining the terms gene, phenotype and genotype, and for his 1903 “pure line” experiments in genetics.

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The brain has three main parts: the cerebrum, cerebellum and brainstem. Cerebrum: is the largest part of the brain and is composed of right and left hemispheres.

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Protoxylem is the first part of the primary xylem that matures and these cells are usually smaller than the metaxylem. Metaxylem is the part of the primary xylem that differentiates after the protoxylem and these cells are usually larger than the protoxylem.

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Alpha-keratin, or α-keratin, is a type of keratin found in vertebrates. This protein is the primary component in hairs, horns, mammalian claws, nails and the epidermis layer of the skin. α-keratin is a fibrous structural protein, meaning it is made up of amino acids that form a repeating secondary structure.