how do the stem modification help in plants give me 6example
Answers
The stem is the ascending part of the axis bearing branches, leaves, flowers and fruits. It develops from the plumule of the embryo of a germinating seed. It bears nodes and internodes. What are nodes and internodes? The regions of the stem where leaves are born are called nodes. On the other hand, internodes are the portions between two nodes.
stems
The stem bears buds, which may be terminal or axillary. Now, let us look at what the functions of a stem are.
Functions of the Stem
The stem performs the two major functions of
Spreading out branches bearing leaves, flowers and fruits.
Conducting water, minerals and photosynthates.
Learn more about the Morphology of Leaf and Fruits here.
However, many a time stems also have various modifications. These help the stem to perform the function of storage of food, support, protection and vegetative propagation. Before we proceed to know more about such modifications, let us look at the various characteristics of stems.
Characteristics of Stems
The stem is an ascending axis of the plant and develops from the plumule and epicotyl of the embryo.
It is generally erect and grows away from the soil towards the light. Therefore, it is negatively geotropic and positively phototropic.
The growing apex of stem bears a terminal bud for growth in length.
In flowering plants, the stem is differentiated into nodes and internodes.
The lateral organs of the stem (i.e., leaves and branches) are exogenous in origin (i.e., from the cortical region).
The young stem is green and photosynthetic.
Hair, if present, are generally multicellular.
In mature plants, stem and its branches bear flowers and fruits
Explanation:
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