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Questions and Answers
What is the tissue responsible for secondary growth in plants?
What is the tissue responsible for secondary growth in plants?
In dendrochronology, what does the study focus on?
In dendrochronology, what does the study focus on?
Which part of the wood in old dicot stems is filled with tannins, resins, and gums?
Which part of the wood in old dicot stems is filled with tannins, resins, and gums?
What is the function of lenticels found in bark?
What is the function of lenticels found in bark?
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What substance deposited on cork cells makes them impervious to water?
What substance deposited on cork cells makes them impervious to water?
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Where are bulliform or motor cells typically found?
Where are bulliform or motor cells typically found?
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What is the main function of plant tissues?
What is the main function of plant tissues?
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From where is the vascular cambium in dicot roots derived?
From where is the vascular cambium in dicot roots derived?
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What causes growth in the circumference of plant stems?
What causes growth in the circumference of plant stems?
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What is the function of cork cambium (phellogen) in plants?
What is the function of cork cambium (phellogen) in plants?
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In dicot roots, which layer does the vascular cambium originate from?
In dicot roots, which layer does the vascular cambium originate from?
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Which statement about wood is correct?
Which statement about wood is correct?
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Study Notes
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.
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Description
Test your knowledge on the anatomy of dicot roots, including the origin and characteristics of vascular cambium, initial cambium formation, and secondary growth. Choose the correct options to answer questions related to dicot root structure.
