AP BIOLOGY

PLANTS

STEMS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The rough outer part of a woody stem is called ____
A
Bark
B
Cortex
C
Xylem
D
Pith
Explanation: 

Detailed explanation-1: -Bark is the outermost layers of stems and roots of woody plants. Plants with bark include trees, woody vines, and shrubs. Bark refers to all the tissues outside the vascular cambium and is a nontechnical term. It overlays the wood and consists of the inner bark and the outer bark.

Detailed explanation-2: -The outer bark, which is mostly dead tissue, is the product of the cork cambium (phellogen). Layered outer bark, containing cork and old, dead phloem, is known as rhytidome.

Detailed explanation-3: -The tissues produced by the cork cambium (also called the phellogen) are the phellum (also called the bark) to the outside and the phelloderm to the inside are collectively called the bark (also called the periderm).

Detailed explanation-4: -Bark comprises all the tissues surrounding the xylem in woody plants. Broadly, bark includes an inner and mostly living region and an outer, dead one. Of all plant structures, bark has the most complex anatomical structure and ontogenetic origin involving two (and often three) different meristems.

Detailed explanation-5: -Noun. stembark (countable and uncountable, plural stembarks) The bark from the stem of a woody plant.

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