Biology MCQs

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Isthmus is called the end part of the oviduct. It is a narrow strip of land that connects two larger landmasses and separates two bodies of water.

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Mastitis refers to Inflammation of Udders. It is most often caused by infection with the Corynebacterium pyogenes bacterium in dry cows and pre-weaned heifers. Antibiotic treatment provides cure.

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Chromosomal crossover (or crossing over) is the exchange of genetic material between homologous chromosomes that results in recombinant chromosomes. It is one of the final phases of genetic recombination, which occurs during prophase I of meiosis (pachytene) during a process called synapsis.

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Holstein Friesian cows are world’s highest-production dairy animals and dominate the global dairy industry. These cows originated in Dutch provinces of North Holland and Friesland, and Schleswig-Holstein in Northern Germany. They are known as Holsteins in North America and Friesians in UK and Ireland.

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The nucleoplasm is the liquid or semi-liquid substance of the nucleus filling the space around the DNA and the nucleoli. It is a type of protoplasm that is made up mostly of water, a mixture of various molecules, and dissolved ions. It is completely enclosed within the nuclear membrane or nuclear envelope.

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Penicillin the so called ‘Wonder drug’ discovered by Alexander Fleming in 1927 is produced from the genus of fungi “Penicillia”. All penicillin are â-lactam antibiotics and are used in the treatment of bacterial infections caused by susceptible, usually Grampositive organisms.

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In the blood the key minerals are iron, copper, zinc, sodium, potassium, calcium and magnesium. Minerals constitute important part of blood plasma that constitutes almost 55% of blood. In the blood, iron is found in larger amounts than any other mineral.

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Guard cells interact physiologically and mechanically with subsidiary cells. Guard cells are those which have chloroplasts and control the opening of stomata. But, subsidiary cells are those which support the guard cells and they do not have chloroplasts.

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The cerebrum is the largest part of the human brain, making up about two-thirds of the brain’s mass. It has two hemispheres, each of which has four lobes: frontal, parietal, temporal and occipital. It is involved in several functions of the body including: determining intelligence; determining personality; thinking, perceiving, interpretation of sensory functions, etc.

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Myrmecology is the scientific study of ants, a branch of entomology. The word myrmecology was coined by William Morton Wheeler (1865–1937), although human interest in the life of ants goes back further, with numerous ancient folk references.