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Science · 2024 · 3 marks
CBSE 2024 · Region 2 · Set 2 · Q27
(a) Give reasons for the following: (i) Alveoli in lungs are richly supplied with blood capillaries. (ii) Respiratory pigment in the blood takes up…
(a)
Give reasons for the following :
(i)
Alveoli in lungs are richly supplied with blood capillaries.
(ii)
Respiratory pigment in the blood takes up oxygen and not carbon dioxide.
(iii)
During anaerobic respiration, a $\displaystyle 3$ -carbon molecule is formed as an end product instead of $\displaystyle \mathrm{CO}_{2}$ in human beings.
OR 27. (b) (i) Name the movements that occur all along the gut in human digestive system. How do they help in digestion ?
(ii)
Where is bile juice stored in human body ? List two roles of bile juice.
Marking-scheme solution
(i) To facilitate efficient exchange of gases.
(ii) It has high affinity for oxygen.
(iii) Lack of oxygen does not oxidise glucose completely and forms a 3Carbon molecule or lactic acid.
(i) • Peristaltic movements
Muscles contract rhythmically in order to push the food forward
in a regulated manner to be digested properly.(ii)
• Gall bladder
Two roles:
Emulsification of fats
Makes the acidic medium alkaline.
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.