7
practice testMultiple Choice

Practice Test

Question 7 • TPS EdX Biology

Which statement best describes the difference between xylem and phloem?

Answer
A
Xylem cells are thin-walled and tubular, and phloem cells are thick walled and strengthened by lignin.
B
Xylem tissue is found at the growing parts of plants, and phloem is found on the outer part of plants.
C
Xylem transports water and nutrients in the plant, and phloem transports water and sugar.
D
Xylem cells make up vascular tissue, and phloem cells make up ground and dermal tissue.

Explanation

Xylem carries water and dissolved mineral nutrients from the roots through the plant. Phloem carries sugars made during photosynthesis to other parts of the plant. Choice C is the best match, although phloem transports sugars along with other organic substances, not water as its main function.

AI-written and checked against the verified answer.

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