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Life Processes Test - 78

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Life Processes Test - 78
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  • Question 1
    1 / -0
    Which of the following are components of blood?
    Solution
    The composition of blood is :
    1. Blood plasma (It contains proteins, amino acids, nitrogenous wastes, nutrients, gases, electrolytes).
    2. Red blood cells
    3. White blood cells
    4. Platelets
    So, the correct option is D.
  • Question 2
    1 / -0
    Choose the correct answer from the alternatives given.
    Drowsiness, felt after a heavy lunch, is due to:
    Solution
    Drowsiness after a heavy lunch is felt due to :
     1. Eating too much-refined carbohydrate induces sugar spikes and crashes, which make us tired.
    2. Digestion requires more blood flow to the stomach, hence less blood to the brain, which makes us feel sleepy.
    3. Decreased blood pressure termed as postprandial hypotension.
    So, the correct option is 'Decreased blood pressure'.

  • Question 3
    1 / -0
    Maximum amount of oxygen is exchanged from the blood in the
    Solution
    • The major function of the respiratory system is to exchange gases like oxygen and carbon dioxide. 
    • Inhaled oxygen reaches the alveoli via lungs.
    • Cells around the alveoli are and the capillaries are not much thick and have more contact with each other. 
    • Therefore more oxygen passes into the blood through the space between them. 
    • Likewise, carbon dioxide passes from blood into the alveoli. 
    • So, the correct answer is option D- 'Capillaries surrounding the alveoli'.
  • Question 4
    1 / -0
    Which of the following compound will be completely reabsorbed in nephrons under normal conditions?
    Solution
    Nearly 99 percent of the filtrate has to be reabsorbed by renal tubules. This process is called reabsorption. Substances like glucose in the filtrate are reabsorbed actively.
    So the correct answer is glucose (A).
  • Question 5
    1 / -0
    Which of the following statements about measurement of blood pressure is true?
    Solution
    The correct answer is B.
    The diastolic reading, or the bottom number, is the pressure in the arteries when the heart rests between beats. This is the time when the heart fills with blood and gets oxygen. A normal diastolic blood pressure is lower than 80. A reading of 90 or higher means you have high blood pressure.
  • Question 6
    1 / -0
    Name the process by which the sun's energy is trapped as the source of energy used by virtually all living organisms 
    Solution
    A)  Metabolism is the breakdown or synthesis of different metabolites inside the body. It is of two types: Anabolism and catabolism. In anabolism, smaller molecules join together to form bigger molecule whereas, in catabolism bigger molecule is split into smaller molecules. 
    B) Glycolysis is the breakdown of glucose molecules into pyruvate during cellular respiration.
    C) Homeostasis is the maintenance of constant body temperature,  in spite of changes in the surrounding temperature. When it becomes too hot outside, our body sweats to cool down the body temperature. When it is too cold outside, our body shivers to raise the temperature.
    D) Photosynthesis is the process exhibited by plants, algae and some bacteria called primary producers' that traps energy in the sunlight to produce food. Other organisms depend on producers for their energy needs directly (herbivores) or indirectly (carnivores and other animals).
    So, the correct option is 'Photosynthesis'.
  • Question 7
    1 / -0
    Carotid artery supplies:
    Solution
    There are two carotid arteries, one on the right and one on the left. In the neck, each carotid artery branches into two divisions: The internal carotid artery supplies blood to the brain. The external carotid artery supplies blood to the face and neck. 
    So, the correct answer is option C- "Oxygenated blood to the brain."
  • Question 8
    1 / -0
    Which of the following statements is true for lymph?
    Solution
    Lymph has a pale yellow colour due to absence of RBCs and platelets,  it has abundance of WBCs, Lymphocytes, carbohydrates, proteins, fats and nitrogenous waste.
    So, the correct answer is 'WBCs + serum'
  • Question 9
    1 / -0
    Select the correct option:
    Mercury (Hg) is generally used in anaerobic respiration experiments because it does not react with ___________.
  • Question 10
    1 / -0
    Which of the following statements is/are incorrect about lymph?
    (i) Lymph is colourful as it has haemoglobin but no RBC.
    (ii) It contains specialized lymphocytes which are responsible for the immunity of the body.
    (iii) Lymph is an important carrier for nutrients and hormones.
    (iv) Fats are absorbed through lymph in the lacteals present in the intestinal villi.
    Solution
    Lymph is colourless as it does not contain RBC, in higher animals the respiratory pigment haemoglobin is contained only in the RBC. Lymph transports from tissues to veins by a system of vessels by the lymphatic system.
    So, the correct answer is 'i only'.
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