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Science · 2023 · 3 marks
CBSE 2023 · Region 2 · Set 3 · Q29
(a) (i) What is meant by excretion? (ii) Name the organ that connects the kidneys with the urinary bladder. State its function. (iii) List two…
(i)
What is meant by excretion ?
(ii)
Name the organ that connects the kidneys with the urinary bladder. State its function.
(iii)
List two factors on which the amount of water reabsorbed depends.
(i)
In the human respiratory system, name the following :
(I)
Part where air is filtered by fine hairs and mucus lining
(II)
Part which separates chest cavity from abdominal cavity
(III)
Balloon like structures where exchange of gases takes place
(IV)
The two large air passages that lead from trachea to the lungs
(ii)
List any two characteristics of lungs which make it an efficient respiratory surface.
Marking-scheme solution
(a) (i) The biological process involved in the removal of harmful nitrogenous metabolic wastes from the body is called excretion.
(ii) Ureter: it serves as a passage for the urine to move from kidneys to the urinary bladder.
(iii) Two factors :
(I) amount of excess water in the body
(II) amount of dissolved waste that is there to be excreted
(ii) • Large surface area
Extensive network of blood vessels
Thin, delicate and fine surface
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.