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Life Processes Test - 56

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Life Processes Test - 56
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  • Question 1
    1 / -0
    Who stated transpiration to be an unavoidable evil?
    Solution
    Curtis (1926) has rightly called that transpiration is a necessary evil because of its advantages and disadvantages.
    Thus, the correct answer is option D.
  • Question 2
    1 / -0
    What is the role of acid in our stomach?
    Solution
    The gastric juice is made up of hydrochloric acid, pepsinogen and other digestive enzymes, gastrin, mucus, and bicarbonates. It has a pH ranging from 1 to 2. Its low pH is essential in activating digestive enzyme such as pepsinogen and convert it into the active pepsin, a Proteolytic activity of pepsin and in destroying various pathogens. 
    Thus, the correct answer is option D.
  • Question 3
    1 / -0
    System of vessels and tubes in animals is called 
    Solution
    • The human circulatory system consists of a muscular chambered heart, a network of closed branching blood vessels and blood, the fluid which is circulated. 
    • It is essentially a network of tubes that supplies to all living cells essential nutrients, O$$_2$$ and other essential substances. 
    • Also, the waste or harmful substances produced are removed continuously for the healthy functioning of tissues.
  • Question 4
    1 / -0
    ............ filter the blood and collect the wastes in kidneys.
    Solution
    The nephron is the structural and functional unit of the kidney. Nephron filters the blood and collects the waste in kidneys. Thus option B is the correct answer. 

  • Question 5
    1 / -0
    Respiration is a process in which
    Solution
    Respiration is the chemical process by which organic compounds release energy. Cell respiration is a process in which glucose is oxidized and produces and stores energy in the form of ATP. It is also called the energy currency of the cell.
    So, the correct answer is option B.
  • Question 6
    1 / -0
    The functional unit of kidney is 
    Solution
    Correct option - B
    Explanation for correct option -
    • The nephron is the functional unit of the kidney. It consists of a coiled renal tubule and vascular network of peritubular capillaries. 
    • It removes waste from the body, regulates blood pressure and volume of the body. 
  • Question 7
    1 / -0
    Plants get rid of excess water by:
    Solution
    Plants produce carbon dioxide and water as respiratory waste products. Plants get rid of excess water by transpiration and guttation. Transpiration is evaporative loss of water from plant leaves through stomata.
    So, the correct answer is 'C'.
  • Question 8
    1 / -0
    The droplets of water arranged at the edges of leaves of roses in the morning are:
    Solution
    Transpiration is the evaporative loss of water by plant. When the soil is too wet, water penetrates the plant through its roots and this creates pressure that forces the water to exit the plant in the form of droplets. 
    This process doesn’t occur during the day, because the leaf’s stomata are open at that time. 
    It occurs when the stomata close down, i.e. at night and water pressure begins to build up. 
    Therefore, the droplets can be noticed when the sun comes up in the morning, before the drops evaporate.
    So, the correct answer is B.
  • Question 9
    1 / -0
    The plants excrete $$CO_2$$ produced as a waste during ______ process in night time.
    Solution
    Plants eliminate waste through diffusion. During the day, excess oxygen gas produced by photosynthesis is released through the stomata. Carbon dioxide produced by respiration is normally used up during photosynthesis. At night, however, as photosynthesis slows, carbon dioxide is not used up as fast as it is produced, and it is released as a waste product. Plants also produce oxygen as a by-product of photosynthesis. The oxygen that is not used for respiration is also excreted through the stomata.
  • Question 10
    1 / -0
    An artificial kidney is a device to remove nitrogenous waste products from the blood through
    Solution
    • In the case of kidney failure, an artificial kidney can be used. 
    • An artificial kidney is a device to remove nitrogenous waste products from the blood through dialysis. 
    • Dialysis is the artificial process of eliminating waste (by diffusion) and unwanted water (by ultrafiltration) from the blood.
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