Photosynthesis

Miss Brianna Murray
Photosynthesis
8th grade Biology
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Slide 1: Slide
Biology9th Grade

This lesson contains 18 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 15 min

Items in this lesson

Miss Brianna Murray
Photosynthesis
8th grade Biology

Slide 1 - Slide

What do we already
know about plants?

Slide 2 - Mind map

We know that plants . . .
  • are alive! 
    - need nutrients (food)
  • are producers in food chains & webs
  • are made of cells
    - cells have chloroplasts

  • Diffusion

Slide 3 - Slide

Learning Goals
  • Define the term autotroph
  • Define the term photosynthesis
    Identify the reactants and products of photosynthesis (chemical equation)

Slide 4 - Slide

Autotrophs
Autotrophs (auto = self, troph = feeding)
- Organisms that can produce their own food
- Photoautotrophs (photo = light): make food from light energy
- Chemoautotrophs (chemo = chemicals): make food from chemical energy
Vs.
Heterotroph (hetero = other)
- Organisms that must feed on other organisms for food
- Herbivores, Omnivores, Carnivores, Detritivores  

Slide 5 - Slide

Slide 6 - Slide

Photosynthesis
Photoautotrophs make their own food using energy from the sun
- Photosynthesis needs certain 'ingredients' 
  • sunlight
  • water
  • carbon dioxide
We call these 'ingredients' the reactants for photosynthesis. These different components will come together, chemically react, and form products.
What products form during photosynthesis? . . . 

Slide 7 - Slide

Photosynthesis
- Photosynthesis makes food
  • oxygen
  • glucose (food)

   
Glucose
Glucose is also a food source for animals. Glucose will then be used by both plants and animals to make energy during cellular respiration.

Slide 8 - Slide

Chemical Equation
carbon dioxide  +   water                               oxygen   +   glucose                      

     CO2       +      H2O                                     O2      +     C6H12O6
sunlight
chlorophyll
sunlight
chlorophyll
Chlorophyll
Remember that plant cells have an organelle called a chloroplast. The function of the chloroplast is to make food (glucose) during photosynthesis. This corganelle contains chlorophyll which is the pigment that makes plants green. Chlorophyll helps to trap sunllight energy in order to make glucose.

Slide 9 - Slide

Photosynthesis

Slide 10 - Slide

Leaf tissue 

Slide 11 - Slide

Leaf Tissue
Waxy cuticle: helps prevent unwanted water loss
Epidermis: In the lower level, this layer of cells contain guard cells and stomata which help regulate gas exchange between the leaf and the environment 
Palisade mesophyll: this layer of cells have a high amount of chloroplasts in them . . . why might the top layer of the leaf have more chloroplasts?
Veins: bring water and nutrients around the plant
Spongy mesophyll: air spaces allow diffusion of gases rapidly
Guard cells: open and close to allow for gas exchange and water (transpiration) -- specialized cells

Slide 12 - Slide

Can we? . . .
  • Define the term autotroph
  • Define the term photosynthesis
    Identify the reactants and products of photosynthesis (chemical equation)

Slide 13 - Slide

Define the term autotroph:

Slide 14 - Open question

Which organisms are
considered autotrophs?
A
Fungus
B
Plants and algae
C
Deep sea bacteria
D
Herbivores

Slide 15 - Quiz

Put the reactants and the products on the correct side of the arrow to complete the chemical equation for photosynthesis:
sunlight/chlorophyll
Reactants:
Products:
Water (H2O)
Carbon Dioxide (CO2)
Glucose (C6H12O6)
Oxygen (O2)

Slide 16 - Drag question

waxy cuticle
upper epidermis
palisade mesophyll
spongy mesophyll
stomata & guard cells
veins

Slide 17 - Drag question

Have you ever wondered?
If plants can make their own food, why do Venus Flytraps eat insects?
Nutrients
Plants need more than glucose to carry out life processes. Our next lesson will discuss the othe nutrients needed by plants.

Slide 18 - Slide