Download C3.2 Leaf and Photos..

B
1. Tissue___
C
2. Organ ___
A
3. System ___
A. Group of organs
working together to
perform specialized
tasks.
B. Group of similar cell
that work together to
carry out the same
function.
C. Groups of tissues
organized into a
structural and
functional unit.
A
B
C
D
• The LEAF is an example of a/an
a) Organ
b) Tissue
c) System
• 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
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”
• Carbon dioxide from the air and water
from the soil, in the presence of light,
produce glucose and oxygen
• 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
• photon – light particles that move in waves
• wavelength – distance between peaks of the waves
• Electromagnetic spectrum
– 380 to 750 nm (visible light)
Photopigments
• Chlorophyll a & b – absorb violet, blue, and red
– wavelengths of light that photosynthesis occurs
• Chlorophylls REFLECT and TRANSMIT GREEN
LIGHT, causing plants to appear GREEN.
• accessory pigments
– e.g.: carotenoids, xanthophylls, anthocyanins
Includes orange, yellow, and red pigments that
color carrots, bananas, squash, flowers, and
autumn leaves.
Yellow pigments
By absorbing colors
Chlorophyll a CANNOT
absorb, the accessory
pigments enable plants to
capture MORE of the
energy in light
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.
C6 H12O6( s )  6O2( g ) 
 6CO2( g )  6H 2O(l )  energy
• Cellular Respiration begins in the
cytoplasm but ends in the mitochondria
• What is the word equation for cellular
respiration?
glucose + oxygen  carbon dioxide + water + energy
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 color of light will not work?
-water
-CO2
2. Photosynthesis produces:
-O2 (oxygen gas)
-C6H1206 (glucose)
3. Online Quiz
Read pp. 303-308
C&R pg 308 #1-5, 7, 8