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प्रश्न
What are meristematic tissues? Explain with the help of suitable diagram. Give their classification on the basis of their position in the plant body.
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उत्तर
Meristematic tissue consists of cells that are capable of division and possesses totipotency—that is, capability to give rise to all cell types of the body. Its cells divide and help in increasing the length and girth of the plant.
The meristematic cells are compactly arranged and have thin cellulosic cell walls. They occur in growing regions of the plant. They are responsible for the formation of new cells of the plants and also heal the injured parts of the plants.
Meristematic tissues are classified into following three types depending upon their position in the plant body:
(i) Apical meristems: They are present at the tip of stems (shoot apex) and roots (root apex) and also in apices of leaves. They bring about elongation of root and stems; hence, they cause an increase in the length of the plant.
(ii) Lateral meristems: They are found beneath the bark and in vascular bundles of dicot stems and roots. They increase the diameter of stems and roots and the girth of the plant.
(iii) Intercalary meristems: They are located at the base of leaves or internodes. They increase the length of leaves and internodes.
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संबंधित प्रश्न
State whether the following statement is True or False.
Meristematic tissue is found at the growing tips of a plant.
Fill in the blank
......................... tissue is situated at the tip of root and stem.
Which one of the following pairs is correctly matched?
Write one word for the following:
Cells least specialized in plants.
Refer to the given figure and select the correct statement.
- A, B, and C are histogen of shoot apex
- A Gives rise to medullary rays.
- B Gives rise to cortex
- C Gives rise to epidermis.
Find out incorrect sentence
The word meristem is derived from the Greek word ______.
How many shoot apical meristems are likely to be present in a twig of a plant possessing, 4 branches and 26 leaves?
Match List - I with List - II.
| List - I | List - II | ||
| (a) | Cells with active cell division capacity |
(i) | Vascular tissues |
| (b) | Tissue having all cells similar in structure and function |
(ii) | Meristematic tissue |
| (c) | Tissue having different types of cells |
(iii) | Sclereids |
| (d) | Dead cells with highly thickened walls and narrow lumen |
(iv) | Simple tissue |
Select the correct answer from the options given below.
Vascular cambium is a ______.
