SCIENCE AND HEALTH V

42. Date: ____________

I.OBJECTIVE:Identify the variables in the experiment.

Values:Cooperation, industriousness

II.SUBJECT MATTER:The Food Factory (Photosynthesis)

A.Science Concepts/Ideas:1. Chlorophyll - the green pigment in plants 2. Cuticle - transparent skin of a leaf 3. Chloroplast - small green packages found inside the cells. 4. Xylem - are veins and venules which are made up of bundles of microscopic tubes. 5. Stomata - tiny openings found on leaves. 6. Phloem - another bundle of microscopic tubes distributed to all the cells of the plant.

B.Processes:Observing, experimenting

C.Materials:Chlorophyll extraction apparatus, denatured alcohol, alcohol burner, leaf

References: Science and Health V Module by Jessie A. Villegas pp. 92-95 Into the Future: S/H V

III.PROCEDURE:A.Preparatory Activity:Checking of AssignmentReview: 1. How do plants respond to water and gravity? 2. How do plants respond to sunlight? 3. How do the plants grow?

B.Developmental Activities:1.MotivationLook at the surroundings. What do you observe on plants? Why are the leaves green?

2.Presentation/ActivityGroup into two. Each group will fill one-half of the chlorophyll extraction apparatus as shown in Fig. 5.2 with denatured alcohol. Cut a green leaf into smaller pieces and immerse then in the denatured alcohol. Fill one-fourth of the enameled dish with water to immerse the bottom of the test tube. Heat the water both with an alcohol burner and allow the denatured alcohol to boil for 10 to 15 minutes. Repeat the above steps using a non-green leaf. 3.Concept FormationEach group will present their experiment. What are the variables in the food factory? What chemical equation is done in photosynthesis? Draw the food factory.

4.ApplicationWhat are the elements of photosynthesis?

IV.EVALUATION:Identify the variables in the diagram.123

Chemical Equation of photosynthesis: sunlight6H2O + 6CO2 C6H12O6 + 6O2

V.ASSIGNMENT:Why are leaves green?