PLANT PHYSIOLOGY
TRANSPORT IN PLANT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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I and II only
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I and III only
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II and III only
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I, II and III
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Detailed explanation-1: -So, the correct answer is ‘Medullary rays.
Detailed explanation-2: -In the stems of dicotyledonous plants, xylem vessels are found. These matured xylem vessels are dead and do not contain cytoplasm and cell organelles.
Detailed explanation-3: -Xylem is a tissue system consisting of specialized cells with lignified secondary cell walls responsible for water movement through the plant. What is lignified? Cells with secondary cell wall thickening typically contain lignin. Lignin is a chemical substance that resists breakdown.
Detailed explanation-4: -In metaxylem vessel cells, which are the major components of xylem tissues, active ROP11 Rho GTPases form oval plasma membrane domains that locally disrupt cortical microtubules, thereby directing the formation of oval pits in secondary cell walls [3-5].