Compression Wood

question 31

Multiple Choice

Compression wood:

• A)develops on the upper side of a leaning stem.
• B)is produced by increased cambial activity on the lower side of a leaning stem.
• C)is the reaction wood found in angiosperms.
• D)is characterized by wider portions of growth rings on the upper side of the stem.
• E)has less lignin and more cellulose than normal wood.

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Definitions:

Pericycle

A layer of cells in plant roots that can give rise to lateral roots and is involved in secondary growth.

Endodermis

The innermost layer of cells in the cortex of a plant root, functioning as a selective barrier that regulates the passage of substances from the soil into the vascular system.

Stele

The central part of a root or stem containing the vascular tissue of xylem and phloem, responsible for the transport of water and nutrients.

Cortex

The outer layer of various organs and structures in the body, such as the brain and adrenal glands, or the primary layer of stems and roots in plants.