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Plant Tissues - Meristems or Meristematic Tissues

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notes

Plant tissues

  • Plants do not move, i.e., they are stationary.

  • Most of the tissues they have are supportive, which provides them with structural strength.

  • Most of these tissues are dead, as they can provide better mechanical strength than the live ones, and need less maintenance.

  • Some of the plant tissues keep on dividing throughout the plant life. These tissues are localised in certain regions

Types of Plant Tissues:

Based on the dividing capacity of the tissues, various plant tissues can be classified as growing or meristematic tissue and permanent tissue which have further sub-divisions as explained below:

Meristematic Tissue

  • Only certain parts of a plant tend to grow. The tissues located in such parts are called meristematic tissues.
  • They have the capability to divide themselves and form new tissues. They have thin cell wall made of cellulose. Also have dense nucleus and cytoplasm but lack vacuoles.
  • They can further we classify differently based on the areas of the plants where they are located -
  1. Apical
  2. Lateral
  3. Intercalary

1.Apical Meristem:

  • They are responsible for the growth of stems and roots in the plants.
  • They are found on the tips of the roots and stems.

2.Lateral Meristem:

  • They are responsible for increasing the circumference of the middle part of the stem and hence are found there.

3.Intercalary Meristem:

  • These tissues are present at internodes or stem regions between the places at which leaves attach.
  • Vacuoles are responsible for storage of food in water. The intercalary tissues do not store them. They are rather responsible for manufacturing them.
  • Moreover, vacuoles contain sap which provides rigidity to a cell. This property of vacuoles may not allow the intercalary tissues to divide and manufacture new cells. Hence vacuoles are not present in intercalary meristem.

definition

Meristematic Tissues: Only certain parts of a plant tend to grow. The tissues located in such parts are called meristematic tissues.

notes

Meristems:

This tissues which have the power of cell division are called meristem. The growth of plant occurs only in certain regions which contains meristem.

  1. Apical meristems - It is present at the growing tip of the stem and roots. It is responsible for the increase in length.

  2. Lateral meristems - It is present at the lateral side of the stem and root. It is responsible for the increase in girth.

  3. Intercalary meristems - It is present at the internodes or base of the leaves. It increases the length between the nodes.

Example

Where is apical meristem found?

Apical meristem is present at the growing tips of stems and roots. Their main function is to initiate growth in new cells of seedlings, at the tip of roots, and shoots.

Apical meristem is a region of growth found in the plant’s shoots tips and root tips as well as the tips of new leaves and shoots. Apical meristem appears as a very dense cluster of undifferentiated cells. From these undifferentiated cells arise the various parts of the part.

Apical meristem is a region of growth found in the plant’s shoots tips and root tips as well as the tips of new leaves and shoots. Apical meristem appears as a very dense cluster of undifferentiated cells. From these undifferentiated cells arise the various parts of the part.

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