which transport
Systems are there in
a planta
Answers
Answer:
Xylem and phloem
There are two transport systems present in the plant to move food, water and minerals through their roots, stems and leaves. These systems make use continuous tubes called the xylem and phloem which are also known as vascular bundles.
Answer:
Plants have two systems for the transportation of substances, by using two different types of transport tissue. Water and solutes are transported by the xylem from the roots to the leaves, while food is transported by the phloem from the leaves to the rest of the plant. Transpiration is the process by which water evaporates from the leaves, therefore causing more water to be drawn up from the roots. Plants have adaptations in order to reduce the excessive loss of water.
Xylem
Xylem vessels are involved in the movement of water through a plant - from its roots to its leaves via the stem.
During this process:
1. Adaption of water from the soil through root hair cells takes place.
2. Water moves by osmosis from root one cell to another until it reaches the xylem.
3. It is transported through the xylem vessels up the stem to the leaves.
4. Water evaporates from the leaves this process is also known as transpiration
The xylem tubes are made from dead xylem cells which have the cell walls removed at the end of the cells, forming tubes through which the water and dissolved mineral ions can flow. The rest of the xylem cell has a thick, reinforced cell wall which provides strength.
Phloem
Phloem vessels are involved in translocation. Dissolved sugars, produced during photosynthesis, and other soluble food molecules are transported from the leaves to growing tissues (eg the tips of the roots and shoots) and storage tissues (eg in the roots).
In contrast to xylem, phloem has of columns of living cells. The cell walls of these cells do not completely break down, but instead small holes are form at the ends of the cell. The ends of the cell are referred to as sieve plates. The connection of phloem cells effectively forms a tube which allows dissolved sugars so as to be transported.
Water on the surface of spongy and palisade cells (inside the leaf) evaporates and then diffuses out of the leaf. This is called transpiration.