Companion cells are seen associated with

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Sclerenchyma is a kind of _____  permanent tissue. (meristematic, complex, simple, living)

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The living plant cell without a nucleus is _____. (tracheids, sieve tube, sclerenchyma, companion cell) 

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Bast fibre is a _____ element. (phloem, xylem, periderm)

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Jute fibre is _____ fibre. (xylem, bast, collenchyma)

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Companion cell lies associated with _____. (tracheids, vessels, sieve tube, phloem parenchyma)

The perforated end walls of sieve tubes are called _____.