Practice free Excretory Products and Their Elimination (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
A fall in GFR triggers the release of which substance from JG cells to restore normal GFR?
The NCERT text states, '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.'
Considering the daily filtrate volume of 180 litres and urine output of 1.5 litres, what percentage of the filtrate is reabsorbed?
The text states, 'A comparison of the volume of the filtrate formed per day (180 litres per day) with that of the urine released (1.5 litres), suggest that nearly 99 per cent of the filtrate has to be reabsorbed by the renal tubules.'
The driving force for glomerular filtration is:
The NCERT text states, 'Filtration is a non-selective process performed by the glomerulus using the glomerular capillary blood pressure.'
Which part of the nephron forms the outer, double-walled cup-like structure that encloses the glomerulus?
The text describes, 'The renal tubule starts with a double walled Bowman’s capsule and is further differentiated... The Bowman’s capsule encloses the glomerulus to form Malpighian or renal corpuscle.'
The afferent arteriole is involved in the formation of which part of the nephron responsible for filtration?
The provided information states, 'Glomerulus is a tuft of capillaries formed from afferent arterioles, fine branches of renal artery.'
Which term best describes the process of filtration performed by the glomerulus, where substances pass based on pressure rather than specific selection?
The NCERT text explicitly refers to filtration as a 'non-selective process performed by the glomerulus'.
A: Nephrons are of two types: Cortical & Juxta medullary, based on their relative position in cortex and medulla. R: Juxta medullary nephrons have short loop of Henle whereas cortical nephrons have longer loop of Henle.
A correct. R is reversed — juxtamedullary have LONG loop of Henle, cortical have short.
Match List I with List II:
| List I | List II |
|---|---|
| A. Taenia | I. Nephridia |
| B. Paramoecium | II. Contractile vacuole |
| C. Periplaneta | III. Flame cells |
| D. Pheretima | IV. Urecose gland |
Taenia → flame cells; Paramecium → contractile vacuole; Cockroach → uricose gland; Earthworm → nephridia.
In cockroach, excretion is brought about by:
A. Phallic gland B. Urecose gland C. Nephrocytes D. Fat body E. Collaterial glands
Urecose gland, nephrocytes and fat body are excretory; phallic and collaterial are reproductive accessory.
Which of the following statements are correct?
A. An excessive loss of body fluid from the body switches off osmoreceptors. B. ADH facilitates water reabsorption to prevent diuresis. C. ANF causes vasodilation. D. ADH causes increase in blood pressure. E. ADH is responsible for decrease in GFR.
A wrong (fluid loss ACTIVATES osmoreceptors). E wrong (ADH doesn't lower GFR). B, C, D correct.
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