Scientists are studying how substances move through a plant. They remove a ring of tissue from the stem. In doing so, some of the transport vessels around the stem’s outer edge are taken away. After several days, they observe swelling above the region where the tissue was removed. What is causing the swelling?
- APhloem vessels have been removed and sucrose cannot move to the sink.
- BPhloem vessels have been removed and sucrose cannot move to the source.
- CXylem vessels have been removed and minerals cannot move to the sink.
- DXylem vessels have been removed and minerals cannot move to the source.