Q4. Assertion: nearly 99 per cent of the glomerular filtrate is reabsorbed. Reason: about 180 litres of filtrate form each day, but only about 1.5 litres of urine are released. Are both true, and does the reason explain the assertion?
Both are true, and the reason explains the assertion: NCERT reaches the 99 per cent figure by comparing the 180 litres of filtrate with the 1.5 litres of urine (NCERT page 209).
Q5. Which two structures form the juxtaglomerular apparatus?
The distal convoluted tubule and the afferent arteriole, modified where they touch (NCERT page 209).
Q6. What drives glomerular filtration?
The glomerular capillary blood pressure (NCERT page 208).