In phloem, photosynthetic products can move both laterally and vertically. Therefore, the protoplasmic strands that link adjacent sieve tube elements are
A) actively opened and closed in response to phytochemical messages.
B) located on sieve tube plates on end walls.
C) located on sieve areas on side walls.
D) largely absent.
E) located on sieve tube plates on end walls and sieve areas on side walls.

Question

Quizplus · Accepted Answer

The protoplasmic strands that link adjacent sieve tube elements in phloem are located on sieve tube plates on end walls and sieve areas on side walls, facilitating the lateral and vertical movement of photosynthetic products.

In Phloem, Photosynthetic Products Can Move Both Laterally and Vertically