NEET Biology question
Not in NEET syllabus
Which of the following statements is/are not true?
I. In CAM plants, stomata open during dark and remain closed during the day. II. Role of Na⁺ in stomatal opening is now universally accepted. III. The water potential of root cells is higher than the water potential of soil. IV. Capillarity theory is the most accepted theory of water movement through plants. V. The walls of xylem vessels, made up of ligno-cellulose, have a strong affinity for water molecules.
Solution
I is true (standard CAM behaviour). II is false — the role of Na⁺ in stomatal opening is not universally accepted; K⁺ is the well-established primary ion. III is false — for water to move from soil into root cells, root-cell water potential must be lower (more negative) than that of the soil, not
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