ANNUAL REFRESHER TEACHERS TRAINING

JULY 2011

A C T I O N P L A N

D A M O D E L H I G H S C H O O L P H : I V

PRESENTED BY :

Ms TABASSUM NASEER

TRANSPIRATION

CONTENTS

Transpiration Transpiration pull Process of transpiration in plants

(Experiment) Stomata (structure & function) Factors affecting the rate of transpiration Hazards

TRANSPIRATION

Objectives 21st Century skills

Bloom’s Taxonomy

21st Century Approaches

Remembering

Understanding

Applying

AnalyzingEvaluating

Creating

BLOOM’S TAXONOMY

LONG TERM GOAL

•Using Bloom’s Taxonomy to develop higher order thinking in students

•To relate 21st century approaches with 21st century skills in order to promote student centered learning

High Order

Thinking

Create

HIGH ORDER

THINKING

ANALYZING

CREATE

EVALUATING

Short Term Goals

SHORT TERM GOAL

AnalysisBy the end of

this topic students will be able to analyze the process of transpiration

and prepare a report.

SHORTTERMGOALS(CONT)

By the end of this lesson students will be able to Compare the transpiration with other process and make a conclusion

Evaluation

SHORTTERMGOALS(CONT)

CreationBy the end of this lesson students will be able to set up a project to show the process of transpiration

• BRAIN STORMING• INTRODUCTION

Monday

• Understand• Explain• Experiment

• Examples

Tuesday

• Display • Feed back• QUIZ

Friday

Timeline(Dimensions of Bloom’s Taxonomy)

INSTRUCTIONAL STRATEGIES

TOPIC TRANSPIRATION

21st Century Approach

Giving direction, listening & speaking skills

Techniques/Modes

Report, speech, project & presentation quiz.

21st Century Skills Communication skills, creativity, self direction & media literacy

To understand the process of transpiration.

To know the factors that affect the process of transpiration.

To understand the importance of transpiration to plants

OBJECTIVES:

WHAT IS TRANSPIRATION?

•.

“The loss of water vapor from the plants, especially through stomata

is called transpiration”.

Transpiration may also refer to sweating

WHAT HAPPENS DURINGTRANSPIRATION?

IMPORTANCE OFTRANSPIRATION:

Creates transpiration pull for transport

Supplies water for photosynthesis

Transports minerals from soil to all parts of a plant

Cools the surface of the leaves (due to the evaporation of water)

Keeps the cells turgid; hence, maintains their shape

ACTIVITY APPARATUS:

Petroleum jelly Water Beaker Oil Bell jar/ polythene

bag

METHODTake a potted plant

Cover it with the polythene bag

Put the set up under the sunlight

Observe what happens

After two hours inside the surface of the Bell jar/ polythene bag will be examined

After two hours small drops of water can be seen and these water vapours comes out from the leaves of the plant

STOMATA

Leaf surfaces are dotted with openings which are collectively called stomata

The stoma (singular of stomata) is bordered by guard cells that open and close the pore

STRUCTURE OF STOMATA

The two bean shaped cell around the stomata are called guard cell.

Change in the size of a stoma is caused by changes in the shape of guard cell.

When stoma is open, CO2& O2 move from air in to the leaf& from leaf in to the air.H2O also escapes through stoma.

How do the guard cells react to the availability of water?

Dry – guard cells CLOSE

lots of H2O – guard cells OPEN

http://www.ualr.edu/~botany/images.html

Function of Guard Cells

V I D E O

1. Transpiration:The process by which plants cool their leaves by the evaporation

of water from the leaves' surfaces or Transpiration is the loss of water from the plant to the atmosphere in the form of vapor.

2. Stomata:The pore like openings on the bottom surface of leaves through

which water and gases pass as they leave the plant. Leaf transpiration occurs through stomata, and can be thought of as a necessary "cost" associated with the opening of the stomata to allow the diffusion of carbon dioxide gas from the air for photosynthesis. Transpiration also cools plants and enables mass flow of mineral nutrients and water from roots to shoots.

OVERVIEW:

3. Guard Cells: The guard cells open and close the stomata as needed. They open the stomata when temperatures are high. They close the stomata when the

plant is water stressed and when the temperature drops.

4. The amount of water that plants transpire varies greatly geographically and over time. There are a number of factors that determine transpiration rates:Temperature: humidity. Wind. Soil water

REFERENCES:

Link: http://plantandsoil.unl.edu/croptechnology2005/pages/?what=animationList *Select Transpiration (5th from the bottom) www.gaaged.org Read more: http://www.brighthub.com/environment/science-environmental/articles/64818.aspx#ixzz1Q3ltXS4R IMAGE CREDIT: All images are courtesy of Wikimedia &Google What 21st Century Technology was used in this unit Video Image File(s) EmailAudio File(s)Student Response System

QUIZ

DA MODEL HIGH SCHOOL PH: IVStudent Activity Pre-Assessment

CLASS: VII TOPIC: Transpiration

NAME: _________________ SEC: __________________1. Complete the blanks in the sentence below. A plant absorbs water through its ______________, and looses water through its _______________. 2. What are the functions of leaves?

A. capture lightB. exchange gasesC. provide a site for photosynthesisD. some leaves store food and waterE. some form new plants and provide support

3. Plants lose water from the leaves into the air. This process is called____________.4. Transpiration is done by a force which is exerted by the plant on the water and this force is called __________.5. The two bean shaped cell around the stomata are called__________.6.__________ permits gaseous exchange with the atmosphere. 7 .Transpiration may also refer to ____________.8. ____________ is a process similar to evaporation.9. 10% water is kept within the plant & __________is lost through transpiration.10. ______________ closes the stomata when the plant is water stressed and when the temperature drops.

THE END