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Life Processes Test - 73

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Life Processes Test - 73
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  • Question 1
    1 / -0
    Which of the following statements is correct with respect to respiration?
    Solution
    Respiration is of two types: aerobic and anaerobic respiration. Aerobic involves oxygen. On the other hand, in anaerobic respiration, respiration occurs in an environment where the oxygen is very less or absent. In both the processes, energy is produced for the organism. But, the energy produced by aerobic respiration is much higher than the energy produced through anaerobic respiration.
    In higher organisms, respiration involves breathing (taking in oxygen-rich air and giving out carbon dioxide-rich air through nostrils) as well as cellular respiration.
    So, the correct answer is option B.
  • Question 2
    1 / -0
    End products of aerobic respiration are
    Solution
    Aerobic respiration is the complete oxidation of sugars in presence of oxygen.
    The carbohydrates are broken down into CO₂ and H₂O and this releases energy. This energy is stored in the form of ATP and later used in the body.
    So, the correct option is 'Carbon dioxide, water, and energy'
  • Question 3
    1 / -0
    Aerobic respiration occurs in 
    Solution
    Aerobic respiration is a two step process. First, glycolysis takes place in the cytoplasm of the cell where glucose breaks down to form pyruvate. Then, pyruvate further breaks down into carbon dioxide, water and energy, which occurs in the mitochondria.
    Thus, option D is correct.

  • Question 4
    1 / -0
    Which of the following carries gases as well as unused products in the human body?
    Solution
    Blood and lymph both are connective fluid tissues that carry $$CO_2$$ (blood also carry $$O_2$$ ), hormones, nutrients and waste products. Haemocyanin is not present in the human being. Thus, the correct answer is option C.
  • Question 5
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    Ventricle is thick walled as compared to atrium, because:
    Solution
    In humans, the heart is a four-chambered muscular organ situated in the thoracic cavity in between the lungs. The upper two relatively small chambers are called atria and two larger lower chambers are called ventricles. The ventricles are thick-walled as compared to atria because they pump blood with huge force.
    So, the correct answer is 'B'.
  • Question 6
    1 / -0
    The process used in separating larger particles from smaller ones in a solution is called:
  • Question 7
    1 / -0

    Arteries have________than veins.

    Solution

    Since the blood emerges from the heart under high pressure, the arteries have thick, elastic walls. Veins collect the blood from different organs and bring it back to the heart. They do not need thick walls because the blood is no longer under pressure. 

    So, the correct answer is option A. 

  • Question 8
    1 / -0
    Which of the following is the major excretory organ in humans? 
    Solution
    Kidneys are the main excretory organs in humans. These help in the filtration of blood and maintain osmoregulation. 
    Accessory organs of excretion are the liver, lungs, and skin. 
    The small intestine and large intestine are vital organs of the digestive system.
    The heart is the main circulatory organ in the human body that helps in pumping blood. 
    So, the correct answer is the option 'kidney.'
  • Question 9
    1 / -0
    Arteries are thick walled, because
    Solution
    Since the blood emerges from the heart under high pressure, the arteries have thick, elastic walls.
  • Question 10
    1 / -0
    Which of the following process can be skipped if someone has taken glucose directly?
    Solution
    Glucose is the simplest and final product after digestion which is absorbed through the blood. So, there is no further digestion required if we take glucose directly. 
    So, the correct answer is option A.
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