Dicot Root Anatomy Quiz

Plant Anatomy

• Periderm is composed of phellem, phellogen, and phelloderm.

Cork Cells

• Cork cells are dead cells.
• The waxy substance associated with cell walls of cork cells is suberin, which makes them impervious to water.

Annual Rings

• Annual rings are distinct in plants growing in temperate regions.

Xylem

• Functional xylem in a dicot tree is spring wood.

Protective Tissues

• External protective tissues of a dicot stem are epidermis and cork.

Cambium

• Cork cambium is a secondary meristem.
• Phellogen is a cambium that produces cork.

Dendrochronology

• Dendrochronology is the study of the age of a tree by counting the number of annual rings in the main stem.

Stem Anatomy

• The tissue made up of thin-walled rectangular cells responsible for secondary growth is cambium.
• In old dicot stems, a major part of the wood is filled up with tannins, resins, gums, etc., and is called heart wood.
• Lenticels develop through the activity of phellogen.
• Lenticels are aerating pores formed in bark.

Heart Wood

• Heart wood or duramen is the inner region of secondary xylem.

Bark

• The bark of a tree comprises all the tissues outside the vascular cambium.

Pericycle

• The layer of cells between endodermis and vascular bundles is called pericycle.

Root Anatomy

• In dicot roots, the vascular cambium is partly primary and partly secondary.
• Initially formed cambium in dicot root is wavy.
• Secondary growth occurs in dicot roots and stems, as well as in gymnosperms.

Functions of Plant Tissues

• Main functions of plant tissues include assimilation of food and its storage, transportation of water, mineral, and photosynthates, and mechanical support.

Cambium Function

• Cambium causes growth in circumference.
• The function of cork cambium (phellogen) is to produce cork and secondary cortex.

Terminology

• Other names of secondary cortex, cork cambium, and cork are phellem, phelloderm, and phellogen, respectively.