The passage describes the transport systems in vascular plants.
Complete the passage by writing a suitable word or words in each blank space.
Plants possess specialised transport tissues to move substances over long distances. Water and dissolved mineral ions are carried from the roots up to the leaves through vessels made of (1) ____________________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}____________________ tissue. These vessels are composed of dead cells aligned end-to-end, with cell walls reinforced by a tough, waterproof polymer called (2) ____________________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}____________________ to prevent collapse under tension. The primary physical force driving this upward movement is the evaporation of water vapour from the leaves, in a process called (3) ____________________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}____________________.
On the other hand, the products of photosynthesis, primarily the soluble sugar (4) ____________________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}____________________, are transported from sources to sinks. This transport occurs through living cells in the (5) ____________________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}____________________ tissue. This multi-directional movement requires metabolic energy and is known as (6) ____________________\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_}____________________.
