ANNUAL REFRESHER TEACHERS TRAINING JULY 2011

1. ANNUAL REFRESHER TEACHERS TRAININGJULY 2011

2. ACTION PLANDA Model High School PH:IV PRESENTED BY : Ms TABASSUM NASEER

3. transpiration

4. CONTENTS • Transpiration • Transpiration pull • Process of transpiration in plants (Experiment) • Stomata (structure & function) • Factors affecting the rate of transpiration • Hazards

5. TRANSPIRATION Bloom’s Taxonomy 21st Century Approaches 21st Century skills Objectives

6. Bloom’s Taxonomy Understanding Remembering Applying Creating Analyzing Evaluating

7. 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

8. Short Term Goals • Create • High Order Thinking

9. Short term goal Analysis By the end of this topic students will be able toanalyze the process of transpiration and prepare a report.

10. ShortTermGoals(Cont) Evaluation • By the end of this lesson students will be able toCompare the transpiration with other process and make a conclusion

11. ShortTermGoals(Cont) • Creation By the end of this lesson students will be able to set up a project to show the process of transpiration

12. Timeline(Dimensions of Bloom’s Taxonomy)

13. Instructional Strategies

14. Objectives: • To understand the process of transpiration. • To know the factors that affect the process of transpiration. • To understand the importance of transpiration to plants

15. . What is transpiration? • “The loss of water vapor from the plants, especially through stomata is called transpiration”. Transpiration may also refer tosweating

16. What happens duringtranspiration?

17. 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

18. ACTIVITY • APPARATUS: • Petroleum jelly • Water • Beaker • Oil • Bell jar/ polythene bag

19. method After two hours small drops of water can be seen and these water vapours comes out from the leaves of the plant Take a potted plant Cover it with the polythene bag • After two hours inside the surface of the Bell jar/ polythene bag will be examined Put the set up under the sunlight Observe what happens

20. 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

21. 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.

22. How do the guard cells react to the availability of water? Dry – guard cells CLOSE lots of H2O – guard cells OPEN Function of Guard Cells http://www.ualr.edu/~botany/images.html

23. VIDEO

27. OVERVIEW: 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.

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

29. 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 • IMAGECREDIT: • All images are courtesy of Wikimedia &Google • What 21st Century Technology was used in this unit • Video • Image File(s) • Email • Audio File(s) • Student Response System

31. QUIZ

32. DA MODEL HIGH SCHOOL PH: IV Student 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 light B. exchange gases C. provide a site for photosynthesis D. some leaves store food and water E. 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 