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Leaf Structures PowerPoint Presentation

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Leaf Structures Presentation Transcript

Slide 1 - Lesson Plan BIOLOGY Std. -XI
Slide 2 - Concept Study of the Leaf structure & Phyllotaxy in plants.
Slide 3 - Purpose Awareness about the structure of a typical leaf & the types of Phyllotaxy in plants for their mode of arrangement
Slide 4 - Category & Time Medium 40-45 minutes
Slide 5 - Learning Outcomes Student’s awareness about the – * Typical leaf structure * Essentiality of various leaf parts in a plant * Familiarity about Phyllotaxy in plants
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Slide 9 - Question session Q. Give the definition of leaf. Q. What do you call the structure by which leaf is attached at plant? Q. Give the technical term for the mode of arrangement of leaves on plant. Q. How many types of arrangement of leaves in plants are there/
Slide 10 - ppt slide no 10 content not found
Slide 11 - Definition of Leaf Leaf is the flattened outgrowth of Stem or a branch that develops at node & has a bud in it’s axil. These are the dissimilar organs & are meant primarily for Photosynthesis, Respiration & Transpiration.
Slide 12 - Parts of the Leaf 1. Leaf Base2. Petiole3. Lamina more
Slide 13 - Leaf Base The part of leaf attached to the stem or branch is called- Leaf base. It protects a Bud in it’s axil.
Slide 14 - Petiole The part of leaf that connects the lamina with stem, is called leaf petiole. Some time a leaf may not have a petiole, such leaves are called – Sessile otherwise the leaf is called Petiolate.
Slide 15 - Lamina It is the flat, expended & broad part of leaf with framework of veins & veinlets. The lamina is the most important part of the leaf as it is the seat of food manufacturing in plant.
Slide 16 - Phyllotaxy It is the mode of arrangement / distribution of leaves on stem or it’s branch. Phyllotxy ensures that leaves may receive maximum sunlight for photosynthesis.
Slide 17 - Alternate Phyllotaxy In such case only one leaf is attached at each node. The leaves are so arranged that a line drawn on the stem through the leaf bases will take a spiral course. Ex. Hibiscus, Brassica etc.
Slide 18 - Opposite Phyllotaxy In such case two leaves are present at each node, standing opposite to each other. It is of two subtypes - Opposite decussate Opposite superposed
Slide 19 - Opposite Decussate Here pairs of leaves at each successive node are placed at right angle to each other. Eg. Ocimum, Calotropis etc.
Slide 20 - Oposite Superposed Here pairs of leaves at each successive node are placed over each other in same plane. Eg.Eugenia,Quisqualis etc.
Slide 21 - Whorled Phyllotaxy In this type more than two leaves are present at each node, forming a whorl. Ex. Oleander, Alstonia etc. http://www.umanitoba.ca/faculties/science/biological_sciences/lab10/biolab10_4.html#Structure
Slide 22 - This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com Is home to well over a thousand powerpoints submitted by teachers. This a free site. Please visit and I hope it will help in your teaching
 

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