Photosynthesis

Photosynthesis

Vocabulary

Photosynthesis - Process by which glucose is made from carbon dioxide and water using light as an energy source

Chloroplast - Organelle where photosynthesis takes place

Pigment - Substance that absorbs light (ex. Chlorophyll)

Photosynthesis Overview

- Plants take in sunlight and convert it to a usable form of food called glucose (simple sugar)

- Equation

6CO₂ + 6H₂O + Light → C₆H₁₂O₆ + 6O₂

(Carbon dioxide + Water + Light → Glucose + Oxygen)

Multiple Select

What are the reactants of photosynthesis?

• Water

• Glucose

• Oxygen

• Carbon dioxide

• Light

Factors that affect Photosynthesis

• Temperature

• Light Intensity

• Amount of CO₂

• Amount of H₂O

Energy Use Review

• Autotrophs - make their own food from the sun

• Heterotrophs - Must eat food for energy

• 
  

• 
  

Multiple Choice

Which type of organism performs photosynthesis?

• Autotroph

• Heterotroph

Pigments

• Def - substance that absorbs light

• Chlorophyll - pigment in plants that absorbs red and blue light and REFLECTS Green light. This is why plants appear green!!

• Carotenoids - pigment that absorbs blue and green light and reflects yellow/orange light.

Multiple Choice

Which pigment are you more likely to see in the fall season?

• Chlorophyll

• Carotenoids

ATP Review

• ATP (Adenosine TRI-phosphate) - Main energy source used in cells.

• Energy is stored in the phosphate bonds. When a phosphate bond is broken off, energy is released.

• ATP --> ADP + Phosphate

Multiple Choice

Which molecule is like a dead battery (where the energy has been used up already)?

• ATP

• ADP

Chloroplast

• Chloroplasts have an inner and outer membrane.

• Thylakoids - Found inside the inner membrane and look like a stack of pancakes or coins

• Stroma - fluid inside the inner membrane

Photosynthesis Occurs in 2 steps

• Light dependent reaction

• Light Independent Reaction (Calvin Cycle

Reaction Locations

• Light dependent Reaction occurs in the thylakoids

• Light Independent Reaction occurs in the stroma

Multiple Choice

Where does the Calvin Cycle take place?

• Thylakoids

• Stroma

Light Dependent Reaction (thylakoids)

• Part 1

• Converts sunlight into ATP and NADPH (molecules of energy)

• Converts water into Oxygen

Multiple Select

What reactants have we used so far?

• Water

• Carbon dioxide

• Light

Light Independent Reaction (Stroma)

• Part 2 - also known as the Calvin Cycle

• Uses energy from Part 1 (ATP and NADPH) and CO₂ to make Glucose.

• 
  

Multiple Select

What products were made in the Light independent Reaction?

• Oxygen

• Glucose

Multiple Choice

The point of plants performing photosynthesis is the create what?

• Energy

• Oxygen

• Glucose

• Carbon Dioxide

Multiple Choice

Why is photosynthesis important to you?

• Plants make oxygen as a bi-product.

• Plants make glucose which you need to eat.

• Plants use carbon dioxide which is toxic to you.

• All of these are important to me.