Differentiate between primary meristem and secondary meristem
Answer
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Hint: The major difference between primary and secondary meristem is their origin. Primary meristems are derived from promeristem, and are responsible for primary growth. Example: Protoderm.
On the other hand, secondary meristems originate from primary tissues and are involved in secondary growth.
Example: Vascular cambium and cork cambium
Complete answer:The term meristem was given by C. Nageli (1858). Growth in plants is largely restricted to specialised regions of active cell division called meristems. Meristem shows totipotency. Meristematic tissue is self-perpetuating. On the basis of their origin meristems are of two types-primary & secondary meristems. They differentiate according to the following:
Note:Following divisions of cells in both primary as well as secondary meristems, the newly formed cells become structurally and functionally specialized and lose the ability to divide. They are now called permanent tissues.
On the other hand, secondary meristems originate from primary tissues and are involved in secondary growth.
Example: Vascular cambium and cork cambium
Complete answer:The term meristem was given by C. Nageli (1858). Growth in plants is largely restricted to specialised regions of active cell division called meristems. Meristem shows totipotency. Meristematic tissue is self-perpetuating. On the basis of their origin meristems are of two types-primary & secondary meristems. They differentiate according to the following:
| Primary meristems | Secondary meristems |
| It involved in the primary growth and thus it gives rise to the primary tissues of the plant | It involved in the secondary growth and thus it gives rise to the secondary tissues of the plant |
| It is responsible for a growth in length. | It responsible for growth in term of thickness |
| Cells are isodiametric i.e. having equal diameters | These cells are elongated barrel shaped or rectangular shaped |
| It arises from embryonic cells i.e. promeristem | It arises from permanent tissue |
| Vacuoles are absent in this type | Large no. of vacuoles is present |
| It is present in apical region of plant | It is present in lateral region of plant |
| Example: protoderm, procambium, etc | Example: vascular cambium and cork cambium |
Note:Following divisions of cells in both primary as well as secondary meristems, the newly formed cells become structurally and functionally specialized and lose the ability to divide. They are now called permanent tissues.
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