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The Colors of Light and Photosynthesis

Explore the relationship between light absorption, color reflection, and photosynthesis. Learn how plants use different colors of light to convert solar energy into glucose through the process of photosynthesis. Discover the connection between photosynthesis and cellular respiration in plant cells.

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The Colors of Light and Photosynthesis

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  1. Photosynthesis

  2. Light Absorption White light How do we know this? • Sun gives off visible (white) light • White light is actually a mixture of ROY G BIV • Red, Orange, Yellow, Green, Blue, Indigo, Violet

  3. Prism White light

  4. Moisture in the air can act like a prism and create a RAINBOW

  5. Light Absorption • Sun gives off visible (white) light • White light is actually a mixture of ROY G BIV • Red, Orange, Yellow, Green, Blue, Indigo, Violet • These colors are either reflected or absorbed by objects • We see reflected light • Green leaves = reflect green light

  6. Which color(s) reflects? Yellow Which color(s) absorb? All the others I see yellow bananas.

  7. Which color(s) reflects? Blue Which color(s) absorb? All the others I see a blue balloon.

  8. Which color(s) reflects? All Which color(s) absorb? None I see white snow.

  9. Which color(s) reflects? None Which color(s) absorb? All I see a black car (although I’m really seeing nothing).

  10. The Full Spectrum of Energy from the Sun Our eyes can only sense this small area called “visible light”

  11. Light & Photosynthesis • Most plants have green leaves, which means they: • Reflect green light • Absorb other colors • Energy in red and blue light most stimulates photosynthesis

  12. Photosynthesis • Defined: process that converts solar energy into glucose • Who: Autotrophs (Plants, algae, some bacteria) • What: Endothermic chemical reaction • Requires energy & MORE energy absorbed • End Result: • Sugar (glucose) • oxygen waste O2 CO2 reactants products

  13. Stage 1: Light Dependent (Light Reactions) Stroma H2 O ADP O H2 ADP • Where: Thylakoid membranes of chloroplast • What happens? • Sunlight & enzymes bond ADP with P to make… ATP • Water (H2O) broken apart • Hydrogen kept for later use; Oxygen is released as a waste • End result: ATP, H2, Oxygen ATP enzymes ATP enzymes H2 O P P H2 O Thylakoids

  14. 30 seconds: Discuss with your neighbor #3 #2 • Are the products of photosynthesis on the left or right of the arrow? • Which reactant(s) are used during the light dependent stage? • Which product(s) are created during the light dependent stage? products reactants

  15. Stage 2: Light Independent (Dark Reactions) Stroma H H2 H ATP CO2 C O O O C CO2 O H H H2 H H H2 C6 H12 O6 enzymes enzymes • Where: Stroma (fluid interior) of chloroplast • What happens? • CO2 taken in • ATP & enzymes break apart CO2 + H2 • C’s, O’s, and H’s recombine into C6H12O6 (Glucose) O C CO2 O CO2 C O O C CO2 O O H H2 H ATP H2 H H H H H2 CO2 O O C What’s the formula for glucose?

  16. 30 seconds: Discuss with your neighbor #2 #1 • Which reactant(s) are used during the light independent stage? • Which product(s) are created during the light independent stage? products reactants

  17. Connection between photosynthesis & respiration Plant Cell • Plants • Create glucose through photosynthesis • Glucose is used to make ATP through cellular respiration chloroplast mitochondria ATP glucose chloroplast mitochondria glucose ATP

  18. Connection between photosynthesis & respiration Glucose (from food) mitochondria ATP • Animals • Plants create glucose through photosynthesis • Animals eat the plants • Glucose is used to make ATP through cellular respiration Glucose

  19. Recap Which color(s) is/are absorbed by a typical red apple? Which color(s) is/are reflected by a typical red apple? Which color light produces the highest rates of photosynthesis? What is used during the light dependent reactions? What created during the light dependent reactions? What is used during the light independent reactions? What created during the light independent reactions? True or False: Plants are the only photosynthetic organisms.

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