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1. Tissue___
2. Organ ___
3. System ___
A. Group of organs working together to perform specialized tasks.
C. Groups of tissues organized into a structural and functional unit.
B. Group of similar cell that work together to carry out the same function.
C
B
A
A
B
CD
a) Organ
b) Tissue
c) System
• The LEAF is an example of a/an
• The leaf is a collection of tissues whose main purpose is to carry out or support the process of photosynthesis. There are special organelles responsible for this. What are the organelles called?CHLOROPLASTS
**Anything this colour, do NOT copy. It’s just for review or interest! Click on the word Photosynthesis, above, and go to “Illuminating Photosynthesis.” Explore the interactive video.
• PHOTOSYNTHESIS is defined as the synthesis of chemical compounds with the aid of radiant energy and especially light.– Photo means light– Synthesis means to make
• It is a chemical reaction performed during the day by producers only.
• It takes place in an organelle unique to plants, called the CHLOROPLAST.
Nature of light
• Wavelength • Electromagnetic spectrum• 380 to 750 nm (visible light)• photon
• Chlorophyll a & b
• accessory pigments– E.g.: carotenoids
& xanthophylls
Photopigments
Interactions of light with chloroplast
Can you identify the different organelles in the cell below?
• Chloroplasts contain the green pigment, CHLOROPHYLL.
• The chlorophyll, found in the thylakoids of the chloroplast, absorbs light energy and stores it as chemical energy in glucose.
• CELLULAR RESPIRATION is a reaction performed both day and night by both producers and consumers
• It is the process by which plants and animals convert the stored energy in their food (glucose) to usable energy to carry out cellular functions.
6 12 6( ) 2( ) 2( ) 2 ( )6 6 6s g g lC H O O CO H O energy
• Cellular Respiration begins in the cytoplasm but ends in the mitochondria
• What is the word equation for cellular respiration?
Gas Production
• Photosynthesis produces O2(g)
• Cellular respiration produces CO2(g)
• Photosynthesis may only occur in the presence of light, so it must happen during the day.
• Cellular respiration may occur at all times.
1. Photosynthesis requires:
-chlorophyll
-sunlight – what colour of light will not work?
-water
-CO2
2. Photosynthesis produces:
-O2 (oxygen gas)
-C6H1206 (glucose)
3. Online Quiz
Read pp. 303-308C&R pg 308 #1-5, 7, 8