Least Mastered Learning CompetencyCompare the light and dark reactions in photosynthesis.

STRATEGIC INTERVENTION MATERIAL

IN SCIENCE AND TECHNOLOGY II

Background of the Study

Learning Photosynthesis is not as easy as A, B, C, especially if the materials are not available or the students forgot to bring the assigned materials.

This SIM inspired material, the students will learn various ways such as games, puzzles and picture analysis.

Learning is fun and dynamic with this Strategic Intervention Material.

Where’s my Food?

Guide card What is photosynthesis?

Students NoteAfter reading this page I still do not understand Now I understand what the

lesson is all about.What I think about the things to

do. Easy HardFor this lesson, I want to study it Alone With one of my classmates. Within the group

Plants, algae, and other chlorophyll-bearing organisms capture light energy and use it to produce food. This energy is passed on to animals that feed directly on plants or on other animals that have fed on plants. The entire process of capturing light energy to produce food is called photosynthesis. The equation is:

6CO2 + 6H2O + light chlorophyll

(energy)C6H12O6 + O6

Photosynthesis is two stage process. The light reaction that took place in the grana of the chloroplast and the dark reaction that took place in he stroma of the chloroplast.

In the light-dependent process, light strikes chlorophyll in such a way as to excite electrons to a higher energy state. In a series of reactions, the energy is converted (along an electron transport process) into ATP and NADPH. Water is split in the process, releasing oxygen as a by product of the reaction. The ATP and NADPH are used to make C-C bonds in the dark reaction. The photosynthetic process, in which food(sugar) molecules are formed from the carbon dioxide in the atmosphere with the use of ATP can occur in the dark as long as ATP is present.

Remember….

Photosynthetic General Equation

WHAT HAPPENS IN PHOTOSYNTHESIS

Activity card 1

Arrange the jumbled letters to produce a word. _________ 1. TAP- formed during light reaction. _________ 2. YGXONE- gas given off by plants. _________ 3. TRELECON- energized during

reaction. _________ 4. AWTRE- splits into hydrogen and

oxygen. _________ 5. LOPHYOLRCHL- traps light energy.

Activity card 2Study the diagram below and complete it using the words in the box.

SUN

Light energy

Is absorbed by

Energy carrier that becomes ENERGIZED CHLOROPHYLL that supplies energy tosplit and add

2H

That is releasedThat are trapped byNADP (H acceptor)

forming

For use in the dark reaction

p

to

( energy carrier)

forming

That stores energy

Word boxfor activity card 2

Water OxygenNADPH2 WaterChlorophyll

Activity card 3THE DARK REACTION

The fixing of carbon in a carbohydrate

Combines with

A five carbon sugar in the chloroplast ( CO2 acceptor)

To form

A very unstable

That splits quickly and forms

PGA, a 3-carbon compound

that combines with

2H supplied by NADPH2 from the light reaction ( energy supplied by conversion of ATP to ADP )

and forms

H2O that is releasedAs a by- product

That can be usedAs nutrient or converted to

andRDP

That is gain usedTo combine with CO2

by combining and substitutingH for a phosphate

Word Boxfor Activity Card 3

PGAL 6 carbon sugarADP 2 moleculesGlucose Carbon dioxide

Check it out!Study the following illustrations below.

Differentiate each stage of photosynthesis.

What I already know about this page? ______________________________________

What I learned from this page?______________________________________

What I still want to know about this page? ______________________________________

What reactions occur?

A

B

Assessment Card 1Students Note

Assessment Card 2.Self-check

Encircle the letter of the correct answer

1. Which of the following reactions is also known as photo phase?a. Light dependent b. Light independent c. Anaphase

2. Which of the following reactions is also known as synthesis phase?a. Light dependent b . Light independent c. Metaphase

3. What kind of energy is used to split two molecules of water?a. Light b. Proton c. Neutron

4. What is the energy source of the cell?a. NAD b. ADP c. ATP

5. What is made up of 5-carbon sugar and an important carbon dioxide acceptor?a. ATP b. RUDP c. PGAL

6. Which co-enzyme capture the hydrogen molecules?a. NADP b. RUDP c. PGAL

7. How many carbon, hydrogen, and oxygen are present in a glucose molecule?a. C6H12O6 b. C5H11O2 c. C12H6O12

8. What are the end product in dark reactions?a. ATP and NADPH b. sugar c. enzyme

9. In which part of the cell does light reactions take place?a. thylakoids b. stroma c. stomata

10. In which part of a plant cell does dark reactions take place?a. thylakoids b. stroma c. stomata

Enrichment Card

Sentence completion…The ___________ is the conversion

of light energy into chemical energy. The light dependent reaction includes the conversion of __________ energy into electron energy, then into short-term energy storage __________. The __________ reaction involves the conversion of short-term energy storage to long term energy storage ___________.

Students noteWhat I already know about this page? __________________________________________________________

What I learned from this page?__________________________________________________________

What I still want to know about this page? __________________________________________________________

Spot the Difference

Reference Card

Dela Cruz, Susana B.Biology ( Pheonix Next Century)Agar, Irene C. et.al.Science and Technology IIInternet Explorer

Answer key

Activity No. 11. ATP2. oxygen3. electron4. water5. chlorophyll

Activity No. 2ChlorophyllWaterOxygenNADPH2

ATP

Activity No. 3CO2

6 carbon sugarPGALGlucoseADP

Assessment No. 1A. Dark reaction or light

–independent reaction

B. Light reaction or light- dependent reaction

Assessment No. 2.1. A 6. A

2. B 7. A3. A 8. B4. C 9. A5. B 10. B

Enrichment Card1. Photosynthesis2. Light3. ATP4. Dark5. Glucose

Man’s pursuit to understand his body and all things around him is relentless. As a Science Teacher, we were tasked to gather data in as far as least mastered skills and competencies of the students in Science and Technology are concerned. I was obliged to teach Science and Technology II, or Biology from school year 2008-Present. During this period of time, I’ve made an observation that students have problems dealing with lessons particularly with the topic of photosynthesis, so I have reached a conclusion that students must not be taught traditionally. Aside from the fact that teachers nowadays serves as facilitators, we need to have follow up activities and an inquiry approach for much greater extent that can be done under the limitations imposed by the Basic Education Curriculum (BEC). And this I believed can be executed by using another version of my Strategic Intervention Materials (SIM). I started to use this technique on some grounds, and this has proven to be effective, especially when reproduced and handed out to learners with difficulties understanding hard topics in Biology.

II- MT II- RA II- RD II-SS

02468

4-Aug '09

6-Aug '09

4-Aug '095-Aug '096-Aug '09mean of unit test

Second year Sections Handled

Mean Scores In Short Quizzes Mean Scores of Ten Question

About PhotosynthesisIn the Unit Test

August 2, 2010 August 3, 2010 August 4, 201010 items 10 items 10 items

II- MT 5.1 5.3 6.1 7.1II- RA 4.9 5 5.9 6.4II- RD 4.8 3.9 4.9 4.9II- SS 4.5 4.7 4.7 4.6

Second year Sections Handled Mean Scores of Ten Questions About Photosynthesis in the SIM ( similar

questions used in the Unit Test )II- MT 8.1

II- RA 7.7

II- RD 7.5

II- SS 7.6

II- MT II- RA II- RD II- SS

77.5

88.5

Series 1

Thank you….