Question

Unique character of Spirogyra vegetative cell is

• A. Cell wall is definite and thick
• B. Cell wall is hygroscopic
• C. Pyrenoid bodies are present
• D. Nucleus have cytoplasmic strands

Answer 1

The correct option is D Nucleus have cytoplasmic strands

The granular cytoplasm is distributed in the peripheral region of the cell. Single large vacuole is bounded by tonoplast and containing watery fluids. Cell sap occupies the central part of the cell. Spirally coiled ribbon shaped chloroplast containing pyrenoids are present in position. The number of chloroplast ranges from 1-16 depending upon the species. The rounded proteineous structures known as pyrenoids lie equidistant from each other inside the chloroplast. They contain central core of starch surrounded by protein plates and helps in formation and storage of starch. Single prominent nucleus lies at the center of the cell, which is held in position by the thin delicate, radiating cytoplasmic strands.