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Excretory Products and their Elimination Test 0

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  • Question 1
    1 / -0
    Which one of the following characteristics is common both is humans are adult frogs, 

    Solution
    In human beings ,some mammals and amphibians (frogs, toads etc) excess nitrogen is excreted as urea  and this mode is called ureotelic mode of excretion. Correct answer is (B).
  • Question 2
    1 / -0
    Functional unit of kidney is
    Solution
    Correct Option: D
    Explanation:
    • The practical unit of the excretory organ is termed as the nephron. It includes a twisted renal tubule and a  shaped structure network of peritubular capillaries.
    •  The tube-shaped structure consists of various regions, every with its own vital performance. Hence, the functional unit of the kidney is the Nephron.
  • Question 3
    1 / -0
    Which has thin and thick segments?
    Solution
    The nephron is the basic functional unit of the kidney. Within the nephron, there is the descending limb of loop of Henle which is followed by the sharp bend of the loop which is then followed by the ascending limb of the loop of Henle. The ascending limb of loop Henle is divided into a thin and thick segments. The thick portion is known as the distal straight tubule, in contrast with the distal convoluted tubule downstream. It drains urine into the distal convoluted tubule. The thin ascending limb is found in the medulla of the kidney. Whereas the thick ascending limb is divided into a part that is in the medulla and a part that is in the cortex. 
    Thus, the correct answer is 'DL of loop of Henle.'
  • Question 4
    1 / -0
    Find out the incorrect statement 
    Solution
    A)Ammonia is the most toxic form and requires a large amount of water for its elimination this is the reason it is necessary to eliminate it from the body.
    B)Kidneys do not play an important role in ammonia removal as it is converted into urea in the liver and then removed by the kidneys.
    C)Human kidneys can only produce hypertonic urine nearly five times concentrated than the initial to maintain the water level inside the body.
    D)Urea may be retained in the kidney matrix of some animals to maintain the desired osmolarity as chemical changes occur which leads to an adverse effect on the body.
    So the correct option is 'Urea may be retained in the kidney matrix of some animals to maintain the desired acidity'.
  • Question 5
    1 / -0
    What is the main toxic waste kidney filters from the blood?
    Solution
    Urea and uric acid are the main toxic wastes filtered by the kidney from the blood. The main toxic waste filtered by the kidney from blood is urea, which is removed in the form of a dilute solution called urine. Creatinine and urea are the waste products that can be easily measured in the blood. Ultrafiltration within the kidney forces the waste products out.
    So, the correct answer is 'Urea'.
  • Question 6
    1 / -0
    Which of the following is not correct with respect to human kidney?
    Solution
    • The peripheral region of the kidney is the cortical region and called cortex but the central is called the medulla.
    • Malphagian corpuscle, convoluted tubules of a nephron are present in the cortical region.
    • Blood in the glomerulus enters through the afferent arteriole and exits from the efferent arteriole.
    • The cocave part of the kidney is called the hilus, from this the ureter and the renal vein exits from the kidney and renal artery enters the kidney.
    • So, the (C) statement is not correct.
  • Question 7
    1 / -0
    Which is the main excretory organ in human beings?
    Solution
    A pair of kidneys are the main excretory organs in human being. It helps excrete nitrogenous waste, toxins, excess of salts, water soluble vitamins etc
    So, the correct answer is 'Kidneys'
  • Question 8
    1 / -0
    Aquatic animals like fish excrete their wastes in gaseous form as 
    Solution
    Aquatic animals perform the procedure of 'Excretion' depending on the availability and unavailability of water. They excrete there waste in the form of ammonia.
    The correct answer is option (c).
  • Question 9
    1 / -0
    Earthworms are
    Solution
    Ammonotelic animals are the animals which excrete ammonia as an excretory product. Ammonia is highly soluble in water and requires a large amount of water for its excretion. 
    Earthworm is both ureotelic and ammonotelic. It excretes waste in the form of urea when present in soil because of less water available in the soil. Urea is far less toxic than ammonia and so can remain inside the body for a longer period without causing any ill effects inside the body. It turns ammonotelic when it is present in aquatic habitat as there is plenty of water so it can easily dissolve in water.
    So, the correct answer is option B.
  • Question 10
    1 / -0
    Bowman's glands are located in the
    Solution
    Olfactory glands also known as Bowman's glands are situated in the olfactory mucosa, beneath the olfactory epithelium the lamina propecia, a connective tissue also containing fibroblasts, blood vessels, and bundles of fine axons from the olfactory neurons. So, the correct answer is 'Olfactory epithelium of nose'.
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