In Gymnosperms, the activity of sieve tubes are controlled by:
A. Nearby sieve tube members.
B. Phloem parenchyma cells.
C. Nucleus of companion cells.
D. Nucleus of albuminous cells.
Answer:C
In Gymnosperms, the activity of sieve tubes are controlled by:
A. Nearby sieve tube members. B. Phloem parenchyma cells. C. Nucleus of companion cells. D. Nucleus of albuminous cells.