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

1. elongating
2. widening
3. maturing
4. differentiating

Correct answer: elongating

Solution

Annular and spiral thickenings are characteristic of protoxylem because they can accommodate elongation of the root or stem. As the organ grows longer, these flexible secondary wall patterns prevent the conducting elements from rupturing.

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