PLANT PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They contain chloroplasts both in the mesophyll and bundle sheath cells
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They contain chloroplasts only in the mesophyll cells.
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They contain chloroplasts only in the bundle sheath cells.
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None of the above
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Detailed explanation-1: -Kranz anatomy is a special structure in the leaves of C4 plants where the tissue equivalent to spongy mesophyll cells is clustered in a ring around the leaf veins outside the bundle sheath cells.
Detailed explanation-2: -C4 plants have a distinctive leaf anatomy (Kranz anatomy), with chloroplast-rich bundle-sheath cells, which form a gas-tight cylinder surrounding the vascular bundle.
Detailed explanation-3: -Bundle sheath cells have thick cell walls and contain centrifugally arranged chloroplasts with large starch granules and unstacked thylakoid membranes, whereas the mesophyll cells contain randomly arranged chloroplasts with stacked thylakoids and little or no starch grains.
Detailed explanation-4: -C4 bundle sheath cells therefore have the chloroplast volume to house sufficient Rubisco to avoid limiting C4 photosynthesis during chilling.
Detailed explanation-5: -C4 plants have a distinctive leaf anatomy (Kranz anatomy), with chlorophyll-containing mesophyll and bundle-sheath cells, which form a gas-tight cylinder surrounding the vascular bundle.