SUPPORT AND TRANSPORT IN PLANTS. ANATOMY OF DICOT PLANTS. The Root. Two types of root systems - tap root system - adventitious root system. Functions of the roots. They anchor the plant firmly to the ground. They absorb water and mineral salts. External Structure of Root Tip.
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ANATOMY OF DICOT PLANTS
- tap root system
- adventitious root system
Root cap is made up of parenchyma cells. It protects the inner layers of the root.
The growing point is made up of meristematic cells. Some of the new cells produced replace the parenchyma cells of the root cap which were damaged.
Region of elongation – the cells comes from the growing point which begin to elongate.
The root hair region has root hairs, which absorb water and mineral salts.
Internally the cells in this region begin to differentiate into epidermis, parenchyma, sclerenchyma, xylem and phloem
Mature region has side roots and fully differentiated tissues.
Functions of the stem:
Secondary thickness takes place in 3 steps:
- xylem vessels
- xylem tracheids
- xylem sclerenchyma
- xylem parenchyma
POINTS TO REMEMBER
OSMOSIS: MOVEMENT OF WATER MOLECULES FROM HIGH
WATER POTENTIAL TO LOW WATER POTENTIAL
THROUGH SEMI PERMEABLE MEMBRANE.
Upward pull = transpirational pull
increases. Wind removes the water vapour around leaf thus increasing water vapour pressure gradient.
Sometimes the stems, becoming limp, causing them to droop.
Then the plant is called wilting.
Guttation: Loss of liquid water through tiny pores, called
hydathodes on margin of leaf.
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