VASCULAR TISSUES

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                                                  VASCULAR TISSUES
  • Vascular tissue is a complex conducting tissue, formed of more than one cell type, found in vascular plants. The primary components of vascular tissue are the xylem and phloem. These two tissues transport fluid and nutrients internally.




Vascular tissue is an arrangement of multiple cell types in vascular plants which allows for the transport of water, minerals, and products of photosynthesis to be transported throughout the plant. Non-vascular plants, such as some algae and moss, do not have vascular tissue and therefore cannot easily transport water and nutrients. Vascular plants use their vascular tissue to transport water and nutrients to great heights, able to feed the tops of trees hundreds of feet high.


Types of Vascular Tissue






Xylem

Xylem is a specialized type of vascular tissue created in vascular plants to transport water and nutrients from the roots of a plant to the tips of the leaves. Every cell in the plant needs water and minerals to survive, and complete necessary reactions. The xylem is created from hollow, dead cells. Water is absorbed into the roots, which creates a positive pressure on the water inside the column. As water evaporates out of the leaves, the process of transpiration pulls water into the leaves. In this way, the xylem serves as a straw, allowing water to carry minerals upwards through the plant.

Phloem

At the same time, the plant is producing sugars via photosynthesis, which must be transported downwards, to the stem and root cells. Another vascular tissue, the phloem, accounts for this process. Unlike the xylem, this vascular tissue is made up of living cells. The so-called sieve cellsare connected via a thin membrane called the sieve plate. Through this channel of phloem cells sugar is transported throughout the plant. Unlike water, sugar is thick and sappy. The phloem requires inputs of water from the xylem and specialized proteins to help quickly pass the sugars through the plant.







COMPARISON


source :
ps://www.ssyoutube.com/watch?v=JFb-CWlz7kE



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