Question

Phloem is without ______in pteridophytes
A. Bast fibers
B. Companion cells
C. Phloem parenchyma
D. Sieve cells

Answer 1

Hint:
Before we proceed with the problem, it is important to know about phloem pteridophytes.
Despite being vascular plants, pteridophytes are not angiosperms because they lack xylem vessels and phloem companion cells. Companion cells and sieve tubes can be found in the angiosperm phloem. Pteridophytes' phloem contains sieve cells but not companion cells or sieve tubes. Only angiosperms contain bast fibres.

Complete step by step answer:
Companion cells, sieve tubes, and phloem parenchyma are all alive cells in angiosperms. The phloem of gymnosperm and pteridophytes lacks a companion cell.
Exceptions Vessels are not present in the xylem, and partner cells are not present in the phloem. Where vessels are present, Selaginella and Equisetum are exceptions. Sew cells and sew tubes have companion cells. Additionally, it controls how those sieve cells behave. And it participates in the loading and unloading of the sieve element with sugar. in order to transport sugar.
Plants that produce spores rather than seeds or flowers are known as pteridophytes. Pteridophytes lack companion cells in their phloem.

Option ‘B’ is correct

Note:
Companion cells are specialized cells that perform various metabolic reactions and regulate cellular processes. They are present in connection with sieve elements. They assist in loading and reloading the sieve element with carbohydrates. Phloem tissue, a sophisticated conducting tissue, is found in vascular plants and is in charge of moving organic compounds like proteins and carbohydrates from the leaves to the rest of the plant.