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Questions and Answers
What is the primary function of the epiblema in a dicot root?
What is the primary function of the epiblema in a dicot root?
Which layer is characterized by having the casparian strips?
Which layer is characterized by having the casparian strips?
What is notable about the vascular bundles in a dicot root?
What is notable about the vascular bundles in a dicot root?
What type of tissue is the conjunctive tissue found between xylem and phloem bundles?
What type of tissue is the conjunctive tissue found between xylem and phloem bundles?
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What is the role of the pericycle in a dicot root?
What is the role of the pericycle in a dicot root?
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Which statement best describes the pith in a dicot root?
Which statement best describes the pith in a dicot root?
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Which of the following components is NOT part of the vascular bundle in a dicot root?
Which of the following components is NOT part of the vascular bundle in a dicot root?
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What function do passage cells in the endodermis serve?
What function do passage cells in the endodermis serve?
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Study Notes
Secretory and Excretory Tissue
- Specialized tissues store secretory or excretory products in cavities.
- Products include gums, oils, mucilage, tannins, and resins.
- Glands can be categorized as internal or external.
Anatomy of Dicot Root
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Epiblema (Rhizodermis or Piliferous layer):
- Outermost layer, consists of thin-walled barrel-shaped parenchyma.
- Lacks intercellular spaces, cuticle, and stomata.
- Features unicellular root hairs for absorption of water and minerals.
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Cortex:
- Multilayered zone of thin-walled parenchymatous cells with intercellular spaces.
- Functions in the storage of food and water.
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Endodermis:
- Innermost layer of the cortex with tightly packed barrel-shaped cells.
- Features Casparian strips (internal bands of suberin/lignin) preventing wall-to-wall movement of substances.
- Contains thin-walled passage cells opposite xylem, aiding water and dissolved salt movement.
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Pericycle:
- Located beneath the endodermis, composed of thin-walled parenchyma without intercellular spaces.
- Responsible for forming vascular cambium and cork.
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Vascular Bundle:
- Positioned inner to pericycle; arranged radially (alternating xylem and phloem).
- Typically contains 2-6 bundles; xylem is exarch (protoxylem at periphery, metaxylem towards center).
- Xylem structure includes vessels, tracheids, parenchyma, and fibers, facilitating water and mineral conduction.
- Phloem consists of sieve elements, companion cells, parenchyma, and fibers, serving in food conduction.
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Conjunctive Tissue:
- Located between xylem and phloem bundles, composed of elongated thin-walled parenchyma.
- Assists in food storage.
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Pith:
- Generally reduced or absent; if present, made of thin-walled parenchyma (with or without intercellular spaces).
- Functions primarily in food storage.
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Description
Explore the specialized tissues in dicot roots, focusing on secretory and excretory tissues. This quiz covers the types of glands involved in secretion, including their structure and function. Test your knowledge on the anatomy specific to dicot roots.
