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The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is:

  1. A
    elongating
  2. B
    widening
  3. C
    differentiating
  4. D
    maturing

Solution & Step-by-step Explanation

Protoxylem is the first-formed xylem. Its elements (annular and spiral vessels) are capable of stretching, allowing them to develop and function while the root or stem is still maturing and undergoing primary growth.

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The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is:
A
elongating
B
widening
C
differentiating
D
maturing

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Plant AnatomyXylemProtoxylem Development

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