Announcements Monday March 30 By the end of class today, I should be able to 1) Summarize Unit 6 learning targets 2) Identify the key structures involved in photosynthesis 3) Describe the process of photosynthesis Skyward is updated check for errors BEFORE leaving school on Wednesday Make-up quizzes tomorrow s & Wednesday s morning tutorials or tomorrow afternoon s study hall. All other times by appointment only (not during lunch). Do NOT take it unless you re prepared for it! Agenda Photosynthesis Review Friday s quiz Photosynthesis notes Begin planning photosynthesis lab 1
1) Photosynthesis Starter a) Think - write in lab journal i. what do you know about photosynthesis? (light energy, plant pigments, etc.) ii. What questions do you have about photosynthesis? 2) Photosynthesis a. Definition: the conversion of light energy to chemical energy stored in organic compounds 1 Organic- molecules containing carbon. 2 Chemical Energy = stored potential energy in the form of the compound ATP. 3 Photosynthesis provides virtually all the energy used by living things b. Remember: ENERGY IS A ONE WAY FLOW! 3) What is Light Anyway? a. Electromagnetic Radiation = Light Energy i. Packets of energy called photons ii. Display properties of waves & particles a. Crest? b. Trough? c. Wavelength? d. Amplitude? e. Frequency? 4) Wave Properties 2
c= Speed of wave (light), therefore c = frequency / wavelength Lower Energy Higher Energy c) wavelength e) frequency d) amplitude a) crest R O Y G B I V b) trough c) wavelength 5) How is Light Captured? a) Chlorophyll-a is the main pigment in plants i. Mainly absorbs violet and red light ii. Why violet? i. High energy iii. Why red? i. Signals that it is low light, so grow FAST!!!!!!! b) What color does it reflect? Green!! 6) Who Captures the Light? a) Earth s Producers: Autotrophs b) Self-feeders (they really feed everything else too!) c) Plants, algae, and some bacteria if it s green it s likely an autotrophs 3
KEY PLANT STRUCTURES INVOLVED IN PHOTOSNYTHESIS captures b) Contains Chlorophyll i. Pigment that light energy. 7) The Chloroplast a) Chloroplast organelle found mainly in leaves where photosynthesis takes place c) That energy can be used to build bigger molecules out of CO 2 i. Starches like cellulose 7) The Chloroplast, con t d. The thylakoid is the light collecting unit of photosynthesis i. Where Light Dependent photosynthesis takes place ii. Inside is the lumen iii. Arranged in stacks called grana. e. The stroma is liquid filled the area around the thylakoids i. Where Light Independent photosynthesis (Calvin Cycle) takes plan Grana Stroma Lumen Thylakoid 8) Stomata a) Openings on the bottom of a leaf to allow gas exchange i. CO 2 in and H 2 O & O 2 out 4
9) Photosynthesis Equation 10) Photosynthesis a) Two stage process b) 1 st : Light Dependent Reaction i. Requires light waste ii. Occur in the grana (Thylakoids) iii. Chlorophyll captures the energy and uses it to make ATP (AdenosineTriPhosphate) which will be used to do the work of making sugar iv. Water is split in the process and v. Oxygen is product 10) Photosynthesis Photosynthesis Lab c) 2nd Part: Light Independent Reaction ( a.k.a. Calvin Cycle) i. Uses ATP as energy to build sugars from CO 2 ii. Occurs in the stroma iii. Result: Food for plant AND other consumers 5
What influences the rate of photosynthesis? 6H 2 O + 6CO 2 + Light E C 6 H 12 O 6 + 6O 2 What are the inputs to this system? H 2 O CO 2 Light What are the outputs from this system? glucose oxygen What influences the rate of photosynthesis? 6H 2 O + 6CO 2 + Light E C 6 H 12 O 6 + 6O 2 What might influence the rate (how quickly) photosynthesis works? What might you be able to measure about the rate? What might be EASIEST to measure? Video on our procedure for measuring Photosynthesis How Does Influence the Rate of Photosynthesis? Your goals Monday Decide what variable will you test? Get necessary paperwork from Mr. Carr. Formulate your experimental question. Make your hypothesis. Complete variable table. Label experimental set up Design procedures and have them okayed by Mr. Carr 6
sink Your goals WED/THURS!! Start planning your lab design both pages. Everyone helps plan ahead and get all set-ups ready -2 syringes so 2 can leaf discs. Can put discs in baking soda solution before start keep out of direct light. Graph results!! 2/3 of a page at least neat! 7