Why is respiratory pigment needed in multicellular organisms with large body size ?

Human Respiratory System, Gas Exchange in Alveoli | PadhAiPro

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TextHuman Respiratory SystemGas Exchange in AlveoliCBSE PYQ

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Give reasons for the following :

CASE_STUDIESHuman Respiratory SystemGas Exchange in Alveoli

In the experimental set-up shown above in diagram (I) atmospheric air is being passed into lime water with a syringe while in diagram (II) air is being exhaled into lime water. The time taken for the lime water to turn milky in both the test tubes is different. Give reason.

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Stomata and Gas Exchange in Plants

Human Respiratory System

Draw the diagram of an open stomatal pore and label (I) Guard cells, and (II) Chloroplast on it. Mention two functions performed by stomata.

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In human respiratory system, when a person breathes in, the position of ribs and diaphragm will be :

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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 3-carbon molecule is formed as an end product instead of CO₂ in human beings.

TextHuman Digestive SystemRole of Digestive EnzymesAnaerobic RespirationGas Exchange in AlveoliRespiration in Aquatic Organisms

Name the movements that occur all along the gut in human digestive system. How do they help in digestion ?

TextHuman Digestive SystemRole of Digestive EnzymesAnaerobic RespirationGas Exchange in AlveoliRespiration in Aquatic Organisms