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Life Processes Test - 41

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Life Processes Test - 41
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Weekly Quiz Competition
  • Question 1
    1 / -0
    On a hot summer day, a plant cools itself by:
    Solution
    Transpiration is the process by which excess water is lost in the form of water vapour from the aerial parts of the plants like leaves, stem, flower, fruits, etc. The change of forms - liquid to a gaseous state, helps in cooling down the surface of the plants. This phenomenon helps the plants in keeping cool during a hot summer day. 
    So, the correct answer is option A.
  • Question 2
    1 / -0
    The exchange of materials between blood and interstitial fluid is happens with the help of:
    Solution
    • Capillaries are the smallest of a body's blood vessels which allows the exchange of materials between blood and interstitial fluid. 
    • They measure 5-10 μm in diameter and are only one cell thick. 
    • They serve to distribute oxygenated blood from arteries to the tissues of the body and to feed deoxygenated blood from the tissues back into the veins, making them an essential part of the circulatory system. 
    So, the correct answer is option C.
  • Question 3
    1 / -0
    Blood enters the heart because muscles of the ___________.
    Solution
    Blood enters from the superior and inferior venae cavae into the right atrium during the relaxation phase of the atrium. The pressure difference between the venae cavae and inside chamber of the right atrium allows the deoxygenated blood to enter the heart. 
    So, the correct answer is option 'B'.
  • Question 4
    1 / -0
    Which of the following statements is correct with reference to the circulation of blood in a mammal?
    Solution
    The left atrium receives oxygenated blood from the lungs through the pulmonary vein. It is the only vein in the human body that carries oxygenated blood. 
    The pulmonary artery carries deoxygenated blood to the lungs for oxygenation. 
    Deoxygenated blood is returned to the right atrium.
    Thus, the correct answer is option A. 
  • Question 5
    1 / -0
    Sphygmomanometer measures:
    Solution
    • Blood pressure is the pressure exerted by the flowing blood on the elastic walls of arteries. 
    • The instrument that is used to measure blood pressure is called a sphygmomanometer.
    So, the correct answer is option C.
  • Question 6
    1 / -0
    During systole of ventricle
    Solution
    During ventricular systole, blood from the left ventricle moves out to the systemic circulation. Deoxygenated blood from the right ventricle moves out into the pulmonary artery to reach the lungs.
    So, the correct answer is option C.
  • Question 7
    1 / -0
    During diastole:
    Solution
    During atrial diastole, deoxygenated blood enters the right atrium through superior and inferior venae cavae and oxygenated blood enters the left atrium through the pulmonary veins. During ventricular diastole, oxygenated blood enters from left atrium to left ventricle and deoxygenated blood enters from the right atrium to the right ventricle.
    So, the correct answer is option D.
  • Question 8
    1 / -0
    Increase in blood pressure is known as
    Solution
    Hypertension is defined as an increase in the blood pressure in the arteries. It is a severe condition that may lead to heart strokes. Normal blood pressure at rest is within the range of 100-140 mm Hg systolic (top reading) and 60-90 mm Hg diastolic (bottom reading). 
    So, the correct answer is option A.
  • Question 9
    1 / -0
    Which one of the following statements is correct regarding blood pressure?

    Solution
    Systolic pressure is the pressure in the arteries during the contraction of the heart while diastolic pressure is the pressure in the arteries when the heart relaxes. Pressure is measured in millimeters of mercury (mm Hg). Normal systolic pressure is 120 mm Hg and diastolic pressure is 80 mm Hg.
    140/90 mm Hg or higher range is considered as high blood pressure. High blood pressure is a major cause of heart disease and strokes, but it also causes kidney disorders and eye problems. 
    So, the correct answer is option A.
  • Question 10
    1 / -0

    Which of the following is single-celled thick?

    Solution

    Blood capillaries are single-cell thick for the proper exchange of materials like gases and nutrients between the blood and the body tissue. 

    Hence, the correct answer is option A. 

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