NCERT Solutions Class 11 Biology Chapter 19 Excretory Products and their Elimination

NCERT Solutions Class 11 Biology Chapter 19 Excretory Products and their Elimination. NCERT book for Biology in Class 11 is strongly suggested by teachers and the CBSE and NCERT boards. These books are now mandatory in various schools. The questions in exams will strictly come from the topics given in these books. Please download the NCERT solutions for Class 11 Biology free in PDF made by teachers of the best schools in India. These solutions are carefully compiled to give detailed understanding of the concepts and also steps of solutions. The NCERT solutions are free to download in pdf format. Please refer to the download link below to download the pdf file and also refer to other chapters and subjects to get the solutions to Biology NCERT book questions and exercises.

1. Define Glomerular Filtration Rate (GFR)

Answer The amount of the filtrate formed by the kidneys per minute is called glomerular filtration rate (GFR).

2. Explain the autoregulatory mechanism of GFR.

Answer The kidneys have built-in mechanisms for the regulation of glomerular filtration rate. One such efficient mechanism is carried out by juxtabglomerular apparatus (JGA). JGA is a special sensitive region formed by cellular modifications in the distal convoluted tubule and the afferent arteriole at the location of their contact. A fall in GFR can activate the JG cells to release renin which can stimulate the glomerular blood flow and thereby the GFR back to normal.

3. Indicate whether the following statements are true or false: 

(a) Micturition is carried out by a reflex.

-- True 

(b) ADH helps in water elimination, making the urine hypotonic.

-- False

(c) Protein-free fluid is filtered from blood plasma into the Bowman's capsule.

-- True

(d) Henle's loop plays an important role in concentrating the urine.

-- True

(e) Glucose is actively reabsorbed in the proximal convoluted tubule.

-- True

4. Give a brief account of the counter current mechanism.

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