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MCQ
Why are companion cells associated with sieve tubes in phloem?
Unit-5 Tissues Organs and Organ Systems
A Sieve tubes are too small to work alone
B Sieve tubes lose their nucleus at maturity and depend on companion cells for metabolic support
C Companion cells carry water through the stem
D Companion cells produce suberin for protection
Explanation

Mature sieve tubes lack a nucleus, so companion cells help in their metabolism and food transport.

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