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Lesson PlanLesson PlanBIOLOGYBIOLOGY
Std. -XStd. -XII
Concept
Study of the Leaf structure & Phyllotaxy in plants.
PurposePurpose Awareness about the Awareness about the
structure of a typical structure of a typical leaf & the types of leaf & the types of Phyllotaxy in plants for Phyllotaxy in plants for their mode of their mode of arrangementarrangement
CategoryCategory & Time& Time
Medium Medium 40-45 minutes40-45 minutes
Learning OutcomesLearning Outcomes
Student’s awareness about Student’s awareness about the –the –
* Typical leaf structure * Typical leaf structure
* Essentiality of various * Essentiality of various leaf parts in a plantleaf parts in a plant
* Familiarity about * Familiarity about Phyllotaxy in plantsPhyllotaxy in plants
Lesson flow Technical
NonTehn-ical
Teacher
Student
WhyTo have an idea about
the importance of leaf parts in a typical
leaf.To catagorise the plants
on the basis of phyllotaxy,
-- Verbal communication
Active Partly active
What Tech.Tech. Non Non Tech.Tech.
TeacherTeacher StudentStudent
Module on Bhartiyavidya
Original leaf Specimens
Active ActiveDefinition of Leaf M
Parts of typicalLeaf M
Importance of these parts
M
Definition of Phyllotaxy
M
Types & subtypes ofPhyllotaxy
H
How Tech.Tech. Non Non Tech.Tech.
TeacherTeacher StudentStudent
Activity: Session of Q/A on leaf
structure & PhyllotaxyStudy the structure of Leaf
through original specimens.
Look at the venation in leaf specimens & study it.
Q/A on Q/A on monitormonitor
Leaf specimens
Active through
explanation
Active
Question sessionQuestion session
Q. Give the definition of leaf.Q. Give the definition of leaf.Q. What do you call the structure by which leaf is attached at Q. What do you call the structure by which leaf is attached at
plant?plant?Q. Give the technical term for the mode of arrangement of Q. Give the technical term for the mode of arrangement of
leaves on plant.leaves on plant.Q. How many types of arrangement of leaves in plants are Q. How many types of arrangement of leaves in plants are
there/there/
What Else Tech.Tech. NonTechni-cal
Teacher Student
1. Collect some more leaf specimens
to identify their venation, from your
neighboring area .2. Categories different plant
as monocot& dicot on the basis of
venation. 3. Find out that all the leaves
have all the three parts or not. If not,
note downthe missing parts.
-- Collection of Collection of leaves samplesleaves samples
PassivePassive ActiveActive
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
Leaf Base
The part of leaf attached to the stem or branch is called- Leaf base. It protects a Bud in it’s axil.
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.
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.
Phyllotaxy
Alternate Opposite Whorled
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 decussateOpposite superposed
Opposite Decussate
Here pairs of leaves at each successive node are placed at right angle to each other. Eg. Ocimum, Calotropis etc.
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.html#Structure
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