LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The concentration of carbon dioxide is higher inside the cell than outside.
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The concentration of carbon dioxide is higher outside the cell than inside.
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The concentration of oxygen is higher inside the cell than outside.
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The concentration of oxygen is higher outside the cell than inside.
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Detailed explanation-1: -A The concentration of carbon dioxide is higher inside the cell than outside.
Detailed explanation-2: -Diffusion and the leaf It diffuses through small pores called stomata. The stomata are mainly in the lower epidermis (the underneath surface) of leaves. During photosynthesis, oxygen levels inside the leaf increase. This causes oxygen to diffuse out of the leaf into the air.
Detailed explanation-3: -Respiration In Leaves This happens as follows: Oxygen from the air enters into a leaf through stomata and reaches all the cells by the process of diffusion. This oxygen is used in respiration in cells of the leaf. The carbon dioxide produced during diffuses out from the leaf into the air through same stomata.
Detailed explanation-4: -In a process called diffusion, oxygen moves from the alveoli to the blood through the capillaries (tiny blood vessels) lining the alveolar walls. Once in the bloodstream, oxygen gets picked up by the hemoglobin in red blood cells.
Detailed explanation-5: -These are surrounded by guard cells which swell to close the stomata or reduce in size to open it. By opening and closing, stomata control the exchange of gases between a leaf and the air surrounding it. Oxygen and carbon dioxide move by diffusion from high to lower concentration through stomata.