Almost Immediately After a Young Leaf Primordium First Begins to Bulge

question 10

Multiple Choice

Almost immediately after a young leaf primordium first begins to bulge out ____.

• A) undifferentiated vascular tissues that will later become xylem and phloem penetrate it
• B) small xylem vessels penetrate it first, followed soon after by phloem
• C) small phloem vessels penetrate it first, followed soon after by xylem
• D) small xylem and phloem vessels penetrate it together
• E) specialized vascular tissue cells penetrate and soon differentiate into phloem or xylem vessels

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