Photosynthesis
Presentation
•
Biology
•
University
•
Easy
+1
Standards-aligned
Sara Hines
Used 2K+ times
FREE Resource
17 Slides • 7 Questions
1
Photosynthesis
Unit: Cell Energy
2
Warm Up Question
What did you eat for breakfast this morning?
How is radiant (sun) energy used to build the sugars you had for breakfast?
3
Open Ended
4
Energy… It’s a part of life!
When learning about photosynthesis, remind yourself that all the energy inevitably came from one place... the Sun!
That energy it then transferred from one source to the next- and eventually, YOU!
5
Poll
6
First Law of Thermodynamics
The first law of Thermodynamics states that matter is neither created, nor destroyed. What does this have to do with Photosynthesis?
7
8
Photosynthesis Overview
Sunlight energy converts carbon dioxide (CO2) and water (H2O) into oxygen (O2) and glucose (C6H12O6).
This is taking Radiant Energy (the Sun) and converting it to Chemical energy (the glucose)
9
Fill in the Blanks
10
Memorizing the Photosynthesis Formula
The reactants (on the left side of the equation) are all things plants need to grow (Sunlight, water, and CO2).
The products (on the right side of the equation) are the things that plants create (Glucose and oxygen gas)
The numbers in front of the molecules are just to balance the chemical equation. They are all 6's except for the glucose which has no precursor number.
Sunlight is not included in the forumla, but you know it is there.
11
Where does Photosynthesis Occur?
Photosynthesis takes place in the leaves.
Inside the leaf, the plant's mesophyll cells contain high levels of chloroplasts which perform photosynthesis.
12
Where does Photosynthesis Occur? (cont')
The chloroplasts inside the mesophyll cells have certain parts that pertain to photosynthesis.
Photosynthesis occurs in the thylakoids and the stroma of the chloroplast.
13
Photosynthesis Pathways
Photosynthesis has 2 pathways- the Light Reactions and the Calvin Cycle (sometimes called the Dark Reactions)
Both pathways occur in a certain part of the chloroplast.
14
The Light Reactions
The Light Reactions occur in the thylakoids of the chloroplasts
The inputs of the Light Reactions are Sunlight and Water (and some electron acceptors)
The output is Oxygen. (and some electron carriers)
15
The Calvin Cycle
The Calvin Cycle occurs in the stroma of the chloroplast
The Input is CO2 (and some electron carriers)
The output is Glucose (and some electron acceptors are regenerated to go back to the Light reactions)
16
Was everything accounted for? When were the Sunlight, CO2, and H2O used? When were the Glucose and Oxygen made?
17
See if you can picture the Photosynthesis equation and place the inputs and outputs where they go
18
Leaves
Leaves play a major role in photosynthesis by allowing for the capture of one of the reactants (CO2) and releasing one of the products (O2)
This gas exchange is performed by a series of special cells that are holes along the bottom of a leaf- stomata!
Stomata are surrounded by two guard cells that control their opening and closing. When it is hot, windy and/or dry, stoma close. When it is cooler or wet, stoma open.
19
Plant Moving System!
Remember, vascular plants move around their materials using vascular tissues.
Xylem is used to bring water from the roots to the leaves for photosynthesis.
Phloem is used to transfer photosynthetic products to the parts of the plant that need them.
20
Factors Affecting Photosynthesis
Water Shortage Some plants are adapted to dry conditions and have small leaves (pine trees) or a thick waxy, cuticle.
Non-ideal Temperatures
Enzymes function best between 0oC and 35oC.
Light Intensity All plants have a maximum rate of photosynthesis, and without light, photosynthesis cannot occur.
21
Multiple Choice
22
Multiple Choice
23
Multiple Choice
24
Open Ended
Photosynthesis
Unit: Cell Energy
Show answer
Auto Play
Slide 1 / 24
SLIDE
