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Life Processes Test - 54

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Life Processes Test - 54
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  • Question 1
    1 / -0
    Lymph can be defined as:
    Solution
    • Lymph is a colorless fluid, containing specialized lymphocytes, which are responsible for the immune responses of the body. 
    • Lymph is also an important carrier for nutrients, hormones, etc. Fats are absorbed through lymph in the lacteals present in the intestinal villi. 
    • Lymph lacks RBCs and platelets. Lymph contains white blood cells. 
    • So option D is correct.
  • Question 2
    1 / -0
    Blood circulation was highlighted first by
    Solution
    William Harvey was an English physician. He was the first known to describe completely and in detail the systemic circulation and properties of blood being pumped to the brain and body by the heart. 
    So, the correct answer is option B.
  • Question 3
    1 / -0
    The smallest blood vessel in the body is:
    Solution

    On reaching an organ or tissue, the artery divides into smaller and smaller vessels to bring the blood in contact with all the individual cells. The smallest vessels have walls which are one-cell thick and are called capillaries. Exchange of material between the blood and surrounding cells takes place across this thin wall.  

  • Question 4
    1 / -0
    Absorption of water from the soil through the roots is increased when:
    Solution
    According to the transpiration pull theory, loss of water from aerial parts due to transpiration is a physical process and the loss of water generates the pulling force. Water is transported as a continuous column in the xylem due to cohesive and adhesive forces exerted by water molecules. The loss of water due to transpiration is equal to the amount of water absorbed from the soil. More the loss of water by transpiration, more is the absorption of water from the soil.
    So, correct answer is option A.
  • Question 5
    1 / -0
    Passive absorption of water takes place by:
    Solution
    According to the most widely accepted theory of ascent of sap. Water is absorbed under the influence of transpiration pull. Transpiration loss of water generates a pulling force, which results in passive absorption of water in the roots.
    So, the correct answer is option D.
  • Question 6
    1 / -0
    Arterial blood pressure in human beings is:
    Solution
    Normal resting blood pressure or arterial blood pressure for an adult human being is about 120/80 mm Hg. Blood pressure is summarized by two measurements, systolic and diastolic, which depend on whether the heart muscles are contracting (systole) or are relaxed between the beats (diastole).
    So, the correct answer is option A.
  • Question 7
    1 / -0
    All veins have deoxygenated blood, except
    Solution
    The pulmonary circulation starts by the pumping of deoxygenated blood by the right ventricle, which is carried to the lungs (through pulmonary artery), where it is oxygenated and returned to the left atrium (through the pulmonary vein). Pulmonary vein is the only vein to carry oxygenated blood.
    The systemic circulation starts with the pumping of oxygenated blood by the left ventricle to the aorta, which is carried to all the body tissues and the deoxygenated blood from there is collected by the veins and returned to the right atrium.
    So, Option D is correct.
  • Question 8
    1 / -0
    Which one of the following indicates the hypertension?
    Solution
    • High Blood Pressure (Hypertension) is the term for blood pressure that is higher than normal (120/80). 
    • If repeated checks of blood pressure of an individual are 140/90 (140 over 90) or higher, it shows hypertension. 
    • High blood pressure leads to heart diseases and also affects vital organs like the brain and kidney.
    So, the correct answer is option D.
  • Question 9
    1 / -0
    Which of the following statement is incorrect?
    Solution

    • At the roots, cells in contact with the soil actively take up ions., which are only present in small quantities. 
    • This creates a difference in the concentration of these ions between the root and the soil. 
    • Water, therefore, moves into the root from the soil to eliminate this difference. This means that there is a steady movement of water into the root xylem, creating a column of water that is steadily pushed upwards. 
    • The excess water absorbed is removed by the process of transpiration.
    • Hence, the correct option is C as plants do not take up inorganic salts and water simultaneously.

  • Question 10
    1 / -0
    Maximum surface area of circulating system is seen in:
    Solution
    An adult human has been estimated to have some 60,000 miles (96,560 km) of capillaries with a total surface area of some 8001000 $$m^2$$.
    The total volume of this system is roughly 5 litres, the same as the total volume of blood. 
    Hence, the correct answer is option B. 
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