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  4. Phloem tissue is composed of sieve tube cells, which form long columns with holes in their end walls called .

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Q. Phloem tissue is composed of sieve tube cells, which form long columns with holes in their end walls called ______.

Transport in Plants

Solution:

Phloem tissue is composed of sieve tube cells, which form long columns with holes (through which food material is conducted) in their end walls called sieve plates.