AP BIOLOGY

PLANTS

PLANT TISSUE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In woody stems, epidermal tissue is replaced by ____ as the plant matures.
A
parenchyma
B
xylem
C
phloem
D
cork
Explanation: 

Detailed explanation-1: -Cork cambium (pl. cambia or cambiums ) is a tissue found in many vascular plants as a part of the epidermis. It is one of the many layers of bark, between the cork and primary phloem. The cork cambium is a lateral meristem and is responsible for secondary growth that replaces the epidermis in roots and stems.

Detailed explanation-2: -The cork cambium or pericambium or Phellogen initially forms from the parenchyma cells in the cortex and at times in the primary phloem. It produces new dermal tissues which gradually replaces the epidermis which is formed by the protoderm.

Detailed explanation-3: -cambium, called the phellogen or cork cambium, is the source of the periderm, a protective tissue that replaces the epidermis when the secondary growth displaces, and ultimately destroys, the epidermis of the primary plant body.

Detailed explanation-4: -Cork cambium forms tissues that form the cork.

Detailed explanation-5: -In woody plants, cork cambium is the outermost lateral meristem. It produces cork cells, which contain a waxy substance that can repel water. The phloem together with the cork cells form the bark, which protects the plant against physical damage and helps reduce water loss.

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