Question

3. 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 1

Answer:

d.nucleus of albuminous cells.

REASON;

1. Normally sieve tubes are controlled by companion cells . But it is present only in Angiosperms and absent in pteridophytes and gymnosperms so functions are carried by albuminous cells.