Biology MCQs

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The parathyroid gland is helpful in increasing blood calcium levels. These glands consist of four small glands that are located behind the thyroid in the neck.

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The thyroid is a lipid-soluble hormone whereas amine, peptide, and protein hormones are water-soluble, ranging in size from 3 to more than 200 amino acids.

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Coxsackieviruses are part of the enterovirus family of viruses, which also include poliovirus and hepatitis A virus. They live in the human digestive system. It also causes Foot and Mouth disease.

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The word angiosperm means seed. The seeds develop inside an organ which is modified to become a fruit. These are also called flowering plants. Plant embryos in seeds have structures called cotyledons. Cotyledons are called ‘seed leaves’ because in many instances they emerge and become green when the seed germinates.

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The morphology of the chromosomes can be distinctly studied at metaphase stage of cell division because at this stage chromosomes are in highly condensed state (25 times of orginal size) and become thicker and well arranged.

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An osteocyte, a star shaped cell, is the most commonly found cell in mature bone, and can live as long as the organism itself. Osteocytes are networked to each other via long cytoplasmic extensions that occupy tiny canals called canaliculi, which are used for exchange of nutrients and waste through gap junctions. The space that an osteocyte occupies is called a lacuna.

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The term fish is most strictly used to describe any animal with a backbone that has gills throughout life and has limbs, if any, in the shape of fins. Many types of aquatic animals commonly referred to as fish are not fish in this strict sense; examples include shellfish, cuttlefish, starfish, crayfish and jellyfish.

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Plants which either obtain readymade organic food prepared by other plants or absorb water and minerals from other plants to prepare their own organic food are called parasitic plants. Cuscuta (Doddar) is a total stem parasite.

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Seahorse is the name given to 54 species of small marine fishes in the genus Hippocampus. It comes under Animalia kingdom; Chordata phylum; Actinopterygii class. Having a head and neck suggestive of a horse, seahorses also feature segmented bony armour, an upright posture and a curled prehensile tail.

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The human brain is divided into three parts : The brainstem which has the pons, the midbrain, and the medulla oblongata. The cerebellum which forms the hindbrain along with the brainstem and is located below the cerebrum. The cerebrum which is the largest section of the brain, is divided into two hemispheres (the left and the right) each of which has four lobes: the frontal, the temporal, the parietal, and the occipital.