Podcast
Questions and Answers
What is the primary function of the leaf blade (lamina)?
What is the primary function of the leaf blade (lamina)?
- Gas exchange
- Transport of nutrients
- Support for the leaf
- Photosynthesis (correct)
Which structure is responsible for regulating the opening and closing of the stomata?
Which structure is responsible for regulating the opening and closing of the stomata?
- Mesophyll
- Guard cells (correct)
- Epidermis
- Spongy cells
What is the role of veins in a leaf?
What is the role of veins in a leaf?
- Gas exchange
- Transport of water and nutrients (correct)
- Photosynthesis
- Protection against pests
Which part of the leaf is typically found at the base of the leaf stem?
Which part of the leaf is typically found at the base of the leaf stem?
What distinguishes palisade cells from spongy cells?
What distinguishes palisade cells from spongy cells?
Where are stomata primarily located on a leaf?
Where are stomata primarily located on a leaf?
What is the purpose of the cuticle on the epidermis of a leaf?
What is the purpose of the cuticle on the epidermis of a leaf?
What is the primary function of the mesophyll tissue in a leaf?
What is the primary function of the mesophyll tissue in a leaf?
Flashcards
Leaf blade (lamina) function
Leaf blade (lamina) function
Photosynthesis
Stomata regulation
Stomata regulation
Guard cells
Role of veins in a leaf
Role of veins in a leaf
Transport of water and nutrients
Part of the leaf at the base of the stem
Part of the leaf at the base of the stem
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Distinguishes palisade cells from spongy cells
Distinguishes palisade cells from spongy cells
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Location of stomata
Location of stomata
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Purpose of the cuticle
Purpose of the cuticle
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Function of mesophyll tissue
Function of mesophyll tissue
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Study Notes
Leaf External Structure
- Stipules: Small, leaf-like structures at the base of the leaf stem.
- Petiole: The stalk that connects the leaf blade to the stem.
- Midrib: The central vein running down the middle of the leaf blade.
- Leaf blade (Lamina): The broad, flat part of the leaf where photosynthesis primarily occurs.
- Veins: Vascular bundles that transport water and nutrients throughout the leaf.
Leaf Internal Structure
- Epidermis: The outermost layer of the leaf, providing protection and often covered with a waxy cuticle.
- Stomata: Small pores on the epidermis, predominantly on the lower surface of the leaf, facilitating gas exchange.
- Guard cells: Two specialized cells surrounding each stoma, regulating its opening and closing to control gas exchange.
- Subsidiary cells: Cells surrounding the guard cells.
- Mesophyll: Tissue located between the upper and lower epidermis, containing:
- Palisade cells: Tightly packed cells with numerous chloroplasts, responsible for the majority of photosynthesis.
- Spongy cells: Loosely arranged cells with air spaces, aiding in gas exchange.
- Veins (vascular bundles): Contain xylem and phloem, responsible for transporting water, minerals, and sugars.
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