You are examining a plant that has recently been discovered.You notice that its leaves have small openings,and that when these openings close,photosynthesis stops.The cells on either side of these pores are
A) sieve tube cells.
B) vascular cells.
C) companion cells.
D) pith cells.
E) guard cells.

Question

You are examining a plant that has recently been discovered.You notice that its leaves have small openings,and that when these openings close,photosynthesis stops.The cells on either side of these pores are 
A) sieve tube cells.
B) vascular cells.
C) companion cells.
D) pith cells.
E) guard cells.

Quizplus · Accepted Answer

Guard cells can change shape to open or close the stomata and thus control water loss and gas exchange.

You Are Examining a Plant That Has Recently Been Discovered