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Life Processes Test - 72

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Life Processes Test - 72
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  • Question 1
    1 / -0
    The major reason for tooth decay are 
    Solution
    Tooth decay is the softening of teeth enamels and refers to the damage of the structure of the tooth. This occurs due to high consumption of chocolates, sweets and cold drinks. Tooth decay is caused by acids that are created when plaque bacteria break down sugar in the mouth. 
    So, the correct answer is  'All of the above'.
  • Question 2
    1 / -0
    The measures to prevent tooth decay are
    Solution
    Tooth decay starts with the erosion of tooth enamel and leads to holes in teeth called cavities. The measures to prevent tooth decay are to brush the teeth twice a day, dental floss, skip sugar, rising the mouth after meals.
    So the correct answer is "All of the above". 
  • Question 3
    1 / -0
    Adenosine triphosphate was discovered by
    Solution
    Adenosine Triphosphate (ATP) was discovered by Karl Lohmann in 1929 from the muscles. These are energy currency of the cell and are produced by the mitochondria of the  cell. The breaks up to form to ADP and inorganic phosphate in order to provide the energy to developing cell.
    So, the correct answer is option C.

  • Question 4
    1 / -0
    The force responsible for upward conduction of water against gravity comes from
    Solution
    Transpiration is the loss of water in the form of water vapor from the parts of the plant. This takes with the help of stomata that are mostly present on the lower surface of leaves. Their opening is controlled by specialized cells called guard cells to regulate the water loss. The water is carried to the leaves from the plant parts against gravity in the upward direction. Thus the correct answer is option A.
  • Question 5
    1 / -0
    Through which of the following parts in plants does maximum transpiration takes place?
    Solution
    Transpiration is a commonly observed process in plants. It refers to the release of water in the form of water vapour from the surface of plants. In plants, transpiration occurs through aerial parts of the plants, i.e. leaves, stems, flowers, fruits. Stomata are small openings present on the surface of the leaves and the release of water vapour occurs through them. About 85-90% of transpiration in plants occur through stomata in leaves.
    So the correct answer is option C.
  • Question 6
    1 / -0
    Water is largely absorbed in ______.
  • Question 7
    1 / -0
    The stomach takes part in _________.
    Solution
    The stomach is a muscular organ located on the left side of the upper abdomen. The food is broken and digested by gastric juices and enzymes. HCl secreted in stomach kills infectious organisms. 
    Hence, Option 'D' is correct.
  • Question 8
    1 / -0
    Blood consists of _______________.
    Solution
    • Blood is made up of two parts i.e., fluid and blood cells. 
    • The fluid part i.e., plasma contains water salts & protein and the blood cells comprise of RBCs, WBCs, and platelets. 
    • The blood cells are suspended in plasma which constitutes 55% of body fluid.
    • Hence, the correct answer is C.
  • Question 9
    1 / -0
    The study of heart is known as:
    Solution
    In Cardiology, cardio means 'heart' and logy means 'study'. It is a branch of science dealing with the disorders of the heart as well as parts of the circulatory system. 
    So, the correct answer is option D.
  • Question 10
    1 / -0
    Human beings have long intestine in order to provide more space for
    Solution
    B. Absorbation of food.
    Solution: In order to absorb the nutrients from the food inside the intestine, there are microvilli on the villi and long intestine, these help in the absorption of nutrients.
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