Question

In pteridophytes, phloem is without

• A. Sieve cells
• B. Sieve tubes
• C. Companion cells
• D. Both B and C

Answer 1

The correct option is D Both B and C

Companion cells are specialised parenchymal cells adjacent to a sieve tube in the phloem of flowering plants, believed to regulate the flow of nutrients through the tube. They lack a cell nucleus, ribosomes, or vacuoles. Thus, they depend on companion cells to provide proteins, ATP, and signalling molecules. Companion cells and sieve tubes are not present in Gymnosperms and Pteridophytes but are present in the fully developed angiosperm plant.

So, the correct answer is option D.