Question

identify the Meristem which is not secondary origin
(1)cork cambium
(2) vascular cambium of dicot root
(3) intrafascicular cambium
(4) interfascicular cambium ​

Answer 1

Answer:

(3) intrafascicular cambium is not secondary in origin.

Explanation:

• Meristematic tissue is a group of young, immature, undifferentiated and thin-walled living cells which retain the capacity for continuous cell division.

• This is most often spelt as a meristem that occurs mainly in the growing regions of the plant body.

• This meristematic tissue is based on origin, meristems are of two types:- Primary meristem and Secondary meristem

• Primary meristem: It is derived directly from promeristem. It builds up the primary part of the plant body. It occurs at the apices of stem, roots and primordia of leaves etc.

• It continues to divide and the derivatives differentiate into permanent tissues.

• Secondary meristem: It develops from primary permanent tissues which regain the power of division i.e. it becomes meristematic at a later stage.
• The secondary meristem adds new cells to the primary body affecting secondary growth in thickness.

• Cork cambium, inter-fascicular cambium, accessory cambium etc. are examples of the secondary meristem.

• Intra fascicular cambium is a primary meristem located in between the xylem and phloem in the dicot stem.

• Since it is derived from the embryonic meristem i.e. the primary origin, it is called the primary meristem.

Hence Intra-fascicular cambium is that meristem which is not secondary in origin.

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Answer 2

Answer:

Intra fascicular cambium is not secondary origin.

Explanation:

• Indeterminate, actively dividing cells make up meristems, which give rise to differentiated permanent tissues. Either primary or secondary are possible.
• A form of meristematic tissue known as a secondary meristem is in charge of plants' secondary growth, or expansion in girth or thickness. It competes with the primary meristem, which is responsible for primary growth, such as length or height growth.
• As a result, in contrast to the primary meristem, a secondary meristem promotes lateral growth.
• Being produced from the permanent tissue further distinguishes it from the primary meristem. Directly from embryonic cells come the primary meristem cells.
• The cells that differentiate into the secondary permanent tissues of the plant, such as phellem, are also produced by the secondary meristem. The lateral meristem is an illustration of a secondary meristem (e.g. cork cambium and accessory cambia).

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