Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

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

Uploaded on 10/09/2012

gurudev
gurudev 🇮🇳

4.6

(10)

102 documents

1 / 17

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Concept
Study of the Leaf structure &
Phyllotaxy in plants.
Docsity.com
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff

Partial preview of the text

Download Leaf structures - Plant Science - Lecture Slides and more Slides Biology in PDF only on Docsity!

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