Q11Written answer
What are the main processes of urine formation?
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Worked solution
The main processes of urine formation are Glomerular Filtration, Reabsorption and tubular secretion.
NCERT Exemplar · Class 11 · Biology
Chapter 19: Excretory Products and Their Elimination
Practice each question, then open the answer or worked solution.
VERY SHORT ANSWER TYPE QUESTIONS
15 questionsQ12Written answer
Sort the following into actively or passively transported substances during reabsorption of GFR. glucose, amino acids, nitrogenous wastes, Na+, water
Solution;
Actively transported: Glucose, amino acids, Na+
Passively transported: Nitrogenous wastes and water
13. Complete the following:
a. urinary excretion = tubular reabsorption + tubular secretion –
b. Dialysis fluid = Plasma–
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Worked solution
a. urinary excretion = tubular reabsorption + tubular secretion – Glomerular filtration.
b. Dialysis fluid = Plasma– nitrogenous wastes
Q13Written answer
Complete the following:
a. urinary excretion = tubular reabsorption + tubular secretion –
b. Dialysis fluid = Plasma–
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Worked solution
a. urinary excretion = tubular reabsorption + tubular secretion – Glomerular filtration.
b. Dialysis fluid = Plasma– nitrogenous wastes
Q14Written answer
Mention the substances that exit from the tubules to maintain a concentration gradient in the medullary interstitium.
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Worked solution
The substances that exit from the tubules to maintain a concentration gradient in the medullary interstitium are urea and sodium chloride.
Q15Written answer
Fill in the blanks appropriately Organ Excretory wastes
a. Kidneys ______________________
b. Lungs ______________________
c. Liver ______________________
d. Skin ______________________
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Worked solution
a) Kidneys – Urea, uric acid, ammonia (based on organisms but usually urea like in human beings)
b) Lungs – CO2 and H2O
c) Liver- Bilirubin, Biliverdin, cholesterol, vitamins and other drugs
d) Skin – Water, Sweat ( salt, urea, lactic acid) , Sebum (sterols, hydrocarbons etc.)