Advertisements
Advertisements
Question
The diagram given below shows a section of human kidney. Study the diagram carefully and answer the questions that follow :
(i) Label the parts numbered 1 to 4.
(ii) Why does part ‘2’ have a striped appearance?
(iii) What is the fluid that passes down part ‘4’? Name the main nitrogenous waste present in it.
(iv) Mention the structural and functional units of kidneys.
(v) Name the two major steps in the formation of the fluid mentioned in Q.5 (a) (iii).
Advertisements
Solution
(i)
1 – Cortex
2 – Medulla
3 – Pelvis
4 – Ureter
(ii) Medulla is composed of a striped substance arranged in several pyramids. Hence, the medulla (2) has a stripped appearance.
(iii) Urine passes down part ‘4’, i.e. ureter. The main nitrogenous substance present in it is urea.
(iv) Nephrons are the structural and functional units of the kidneys.
(v) The two major steps in the formation of urine are ultrafiltration and selective reabsorption.
APPEARS IN
RELATED QUESTIONS
The nephrons discharge their urine at ______.
Define excretion. Name the excretory unit of a kidney.
Draw a neat labelled diagram of the human excretory system.
The procedure of cleaning the blood of a person by using a kidney machine is known as:
(a) ketolysis
(b) hydrolysis
(c) dialysis
(d) photolysis
Differentiate between
tannins and resins
Given below is a set of five terms. Rewrite the terms in their correct order so as to be in logical sequence.
Afferent arteriole, renal vein, secondary capillary network, glomerulus, efferent arteriole.
Define the following term:
Osmoregulation
Given below is a simplified diagram of the human kidney cut open longitudinally. Answer the questions that follow.
 |
- Define excretion.
- Why does the cortex of the kidney show a dotted appearance?
- Why does the medulla of the kidney show a striped appearance?
- Write two differences in the composition of the blood flowing through the blood vessels 'A' and 'B'.
Write the functional activity of the following structure: Aldosterone
Plants use completely different process for excretion as compared to animals. Which one of the following processes is NOT followed by plants for excretion?
