First slide

The Tissues

Question

Choose the correct statement.

Moderate

A

Primary phloem can be demarcated into protophloem and metaphloem.
B

Albuminous cells are associated with sieve tubes.
C

Sieve cells of pteridophytes are associated with albuminous cells.
D

Companion cells are associated with sieve cells.

Solution

Primary phloem can be demarcated into protophloem with narrow sieve tubes and metaphloem with broad sieve elements. Albuminous cells are associated with sieve cells of gymnosperms only but not pteridophytes. Companion cells are associated with sieve tubes only but not sieve cells.

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