Concept
Study of the Leaf structure &
Phyllotaxy in plants.
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Leaf structures - Plant Science - Lecture Slides, Slides of Biology
This lecture series contains animal behavior, cereal, earthworm, fossils, growing plants, living factories, lower plant, mammals, natural vegetation, plant division and sharks. This lecture covers: Concept, Phyllotaxy, Leaf, Purpose, Arrangement, Typical, Definition, Respiration, Transpiration, Photosynthesis, Petiole, Lamina, Hibiscus, Brassica, Decussate.
Typology: Slides
2011/2012
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Concept
Study of the Leaf structure &
Phyllotaxy in plants.
Purpose
Awareness about the
structure of a typical
leaf & the types of
Phyllotaxy in plants for
their mode of
arrangement
What Tech.^ Non
Tech.
Teacher Student
Module on Bhartiyavi dya
Original leaf Specimens
Active Active Definition of Leaf M Parts of typicalLeaf M Importance of these parts
M
Definition of Phyllotaxy
M
Types & subtypes of Phyllotaxy
H
How Tech.^ Non Tech.^ Teacher^ Student
Activity: Session of Q/A on leaf structure & Phyllotaxy Study the structure of Leaf through original specimens. Look at the venation in leaf specimens & study it.
Q/A on monitor
Leaf specimens
Active through explanation
Active
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.
Parts of the Leaf
1. Leaf Base2. Petiole3. Lamina
more
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.
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.
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.
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
Oposite Superposed
Here pairs of leaves at each successive node are
placed over each other in same plane.
Eg.Eugenia,Quisqualis etc.
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.h tml#Structure