Photosynthesis and Respiration
Chapter 5 Section 1
p.128- 135
A. Taking in Raw Materials

How plants eat and breathe
1. Movement of materials

A. Most water enters
through the roots of a
plant
1. Movement of materials


A. Most water enters
through the roots of a
plant
B. Water vapor exits
through the leaves.
1. Movement of materials



A. Most water enters
through the roots of a
plant
B. Water vapor exits
through the leaves.
C. Carbon dioxide
and oxygen enter and
exit through the
leaves
2. Leaf structure and function
Layers of cells
2. Leaf structure and function
Layers of cells

A. Epidermis- Outer layer
containing many stomata to
control water loss
2. Leaf structure and function
Layers of cells


A. Epidermis- Outer layer
containing many stomata to
control water loss
B. Spongy layer- Contains
carbon dioxide and water (vapor)
needed for food production
2. Leaf structure and function
Layers of cells



A. Epidermis- Outer layer
containing many stomata to
control water loss
B. Spongy layer- Contains
carbon dioxide and water (vapor)
needed for food production
C. Food is produced in the
palisade layer
3. Chloroplasts and pigments
3. Chloroplasts and pigments

A. Chloroplasts- cell
structures in which
photosynthesis occurs
3. Chloroplasts and pigments


A. Chloroplasts- cell
structures in which
photosynthesis occurs
B. Chlorophyll is the
green pigment in
chloroplasts
3. Chloroplasts and pigments



A. Chloroplasts- cell
structured in which
photosynthesis occurs
B. Chlorophyll is the
green pigment in
chloroplasts
C. Pigments help
plants absorb light
energy to make food
B. Food-Making Process


1. Photosynthesis- plant uses carbon
dioxide, water, and light energy in the
presence of chlorophyll to make glucose
and oxygen.
In two parts:
-Light dependent reactions
-Light independent reactions
Photosynthesis

2. Light dependent reactions (can only take
place in the presence of sunlight)

- light energy splits water into oxygen and
hydrogen; hydrogen kept for later
reactions, oxygen is released as a waste
product
Photosynthesis

3. Light independent reactions (can take
place in the absence of sunlight)
a. Carbon dioxide and hydrogen from
light- dependent reactions combine to make
glucose.
Photosynthesis

3. Light independent reactions (can take
place in the absence of sunlight)


a. Carbon dioxide and hydrogen from
light- dependent reactions combine to make
glucose.
b. Glucose is used in a plant’s structure
and growth
Photosynthesis




3. Light independent reactions (can take place in
the absence of sunlight)
a. Carbon dioxide and hydrogen from light
dependent reactions combine to make glucose.
b. Glucose is used in a plant’s structure and
growth
c. Extra glucose is stored as other sugars or
carbohydrates
Photosynthesis


4. Importance of photosynthesis
a. Directly or indirectly produces food for
almost all organisms
Photosynthesis



4. Importance of photosynthesis
a. Directly or indirectly produces food for
almost all organisms.
b. Removes carbon dioxide and adds
oxygen to the atmosphere
C. Breakdown of food

Respiration releases energy
=
Respiration

1. Chemical reactions that break down food
molecules and release energy
Respiration


1. Chemical reactions that break down food
molecules and release energy
a. Glucose is broken down into smaller
molecules in a cell’s cytoplasm.
+
+
Respiration



1. Chemical reactions that break down food
molecules and release energy
a. Glucose is broken down into smaller
molecules in a cell’s cytoplasm.
b. Aerobic respiration uses oxygen to
break down smaller molecules and occurs
in cell’s mitochondria.
Respiration

2. Respiration is important because it
provides cells with useable energy.
Respiration



2. Respiration is important because
it provides cells with useable
energy.
a. Energy helps to transport and
produce materials
b. Waste product of respiration is
carbon dioxide which is returned to
the atmosphere
Respiration


2. Respiration is important because it
provides cells with useable energy.
a. Energy helps to transport and produce
materials
D. Comparisons

Photosynthesis and respiration are reverse
processes
CO2
and
H2O
Respiration
Photosynthesis
C6H12O6 and O2
D. Comparisons


Photosynthesis and respiration are reverse
processes
1. Photosynthesis, occurring only in cells
with chlorophyll, combines carbon dioxide
and water using light energy and releases
glucose and oxygen.
D. Comparisons



Photosynthesis and respiration are reverse
processes
1. Photosynthesis, occurring only in cells with
chlorophyll, combines carbon dioxide and water
using light energy and releases glucose and
oxygen.
2. Aerobic respiration occurs in the mitochondria
of all cells and combines oxygen and food to
release energy, carbon dioxide, and water.