Biology GK Questions Quiz-75

Biology GK Questions Quiz-75

Biology Multiple Choice Questions (MCQs) Quiz for State and UPSC Civil Services Examinations. Objective Questions on Biology for competitive examinations.

    1481.The only living tissue in plant xylem is

    (1) Trachea
    (2) Xylem fibre
    (3) Xylem parenchyma
    (4) Tracheid
    Answer:
    1481.(3) Xylem parenchyma is the only living component found in xylem tissue. They are living cells associated with the xylem that are found in between the vessels and the fibers. They act as storage house of starch and fat with assisting in conduction of water. Xylem is a complex permanent tissue specialized for the conduction of water and mineral substances in plants.

    1482.‘Insectivorous plants’ trap insects for

    (1) Nitrogen
    (2) Fats
    (3) Vitamins
    (4) Carbohydrates
    Answer:
    1482.(1) Insectivorous plants trap insects because they grow in a soil which is deficient in nitrogen (such as acidic bogs and rock outcrops). The insects they feed on help them in fulfilling their nitrogen needs. Venus flytrap, pitcher plant, utricularia, drosera and Rafflesia are the examples of insectivorous plants.

    1483.Riboflavin is a/an

    (1) Vitamin 
    (2) Hormone
    (3) Fatty acid 
    (4) Enzyme
    Answer:
    1483.(1) Riboflavin, also known as vitamin B2, is one of the eight B-complex vitamins. It is a water-soluble vitamin that functions as a coenzyme, meaning that it is required for enzymes (proteins) to perform normal physiological actions. Riboflavin is found in milk, cheese, eggs, leaf vegetables, liver, kidneys, legumes, mushrooms, and almonds.

    1484.Locomotory organ of a starfish is

    (1) Tube feet 
    (2) Paddle
    (3) Muscular foot 
    (4) Flipper
    Answer:
    1484.(1) Starfish carry out movements with the help of tube feet that are part of the water vascular system. Apart from their function in locomotion, the tube feet act as accessory gills. The water vascular system serves to transport oxygen from, and carbon dioxide to, the tube feet and also nutrients from the gut to the muscles involved in locomotion.

    1485.The latex of which plant is used commercially ?

    (1) Papaya plant
    (2) Sial kanta plant
    (3) Rubber plant
    (4) Banyan tree
    Answer:
    1485.(3) Natural rubber is harvested mainly in the form of the latex from the rubber tree. The latex is a sticky, milky colloid drawn off by making incisions in the bark and collecting the fluid in vessels in a process called “tapping”. The latex then is refined into rubber ready for commercial processing.

    1486. Which of the following causes swine flu ?

    (1) Bacteria 
    (2) Fungi
    (3) Tapeworm 
    (4) Virus
    Answer:
    1486.(4) Swine influenza, also called pig influenza, swine flu, hog flu and pig flu, is an infection caused by any one of several types of swine influenza viruses.Swine flu, also known as the H1N1 virus, is a relatively new strain of an influenza virus that causes symptoms similar to the regular flu. 

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