Which of the following cells form components of complex permanent tissue in plants? I. Companion cells II. Sieve tubes III. Tracheids IV. Vessels Select the answer using the code given below:
I, II, III and IV
Complex permanent tissues in plants are made up of more than one type of cell that work together as a unit. Phloem consists of sieve tubes, companion cells, phloem parenchyma and phloem fibres, while xylem consists of tracheids, vessels, xylem parenchyma and xylem fibres. Thus, companion cells, sieve tubes, tracheids and vessels are all components of complex permanent tissue, making statements I, II, III and IV correct.
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