Why do large plants need a transport system?

Most multicellular plants and animals have too small a surface area to volume ratio so diffusion would be too slow to provide the necessary molecules. Therefore, they require a system to transport nutrients and waste products around the organism.

In respect to this, what is the transport system of a plant?

Plants have two systems for the transportation of substances – using two different types of transport tissue. Xylem transports water and solutes from the roots to the leaves, while phloem transports food from the leaves to the rest of the plant.

How does the phloem transport food?

Phloem is vascular tissue that moves food throughout the plant. It does this through a series of tubes that connect sugar sources (such as leaves) to sugar sinks (such as growing fruits, stems and roots). Phloem can be made of sieve cells, sieve tubes and sieve plates.

How does a plant transport food and water through itself?

The movement of water throughout a plant is driven by the loss of water through it's leaves, or transpiration. The water molecules that move through the xylem are connected in a continuous “stream”. The sugars are made in the leaves as a product of photosynthesis.
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