Biology MCQs

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A scrotal ligament is the remnant of the gubernaculum in a fetus. It secures the testis to the most inferior portion of the scrotum.

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Streptococcus Pyogenes, Escherichia Coli, and Pseudomonas Aeruginosaare examples of harmful microbes. They can be transmitted through a variety of mediums in our bodies.

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Down’s syndrome is an example of a chromosomal disorder. Whereas Albinism, Haemophilia, and Sickle cell anemia are examples of Mendelian Disorder.

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Animals, such as mammals and birds, that maintain a constant body temperature regardless of the temperature of the surroundings are called warm blooded. These include birds and mammals. Whales are aquatic mammals hence, being mammal, they are warm blooded. The have a thick layer of fats called blubber underneath their skin to maintain temperature even in cold water of oceans.

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A scavenger is an organism that mostly consumes decaying biomass, such as meat or rotting plant material. Fungi are called as scavengers of earth as they decompose waste.

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The literal meaning of ‘sanguinivorous’ is someone subsisting on a diet of blood, or blood-sucking bats and animals. Mosquitoes belong to this category. Leech, female mosquitoes, vampire bats are other examples of Sanguivores.

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Plasma is a straw coloured, viscous fluid constituting nearly 55 per cent of the blood. 90-92 per cent of plasma is water and proteins contribute 6-8 per cent of it. Fibrinogen, globulins and albumins are the major proteins. Fibrinogens are needed for clotting or coagulation of blood; while, globulins primarily are involved in defense.

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Living beings are systems or organisms that tend to respond for changes in their environment and inside themselves, in such a way as to promote their own continuation and longevity. They have the ability to breathe or respire, move or navigate and the ability to multiply. Living organisms include human beings, plants, insects, animals among others.

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Influenza, commonly known as ‘the flu’, is an infectious disease caused by an influenza virus. There are 4 types of seasonal influenza viruses, types A, B, C and D. Influenza A and B viruses circulate and cause seasonal epidemics of disease.

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Ichthyophis lacks tongue. It is sometimes called the Asian caecilians. It is limbless amphibian. In Sri Lanka, three species occur. All are found in almost all habitats, but are known to prefer moist ones.