Assignment #Light Dependent

Reactions of Photosynthesis

Honors BiologyApril 21, 2023

Miss Moon

I. Photosynthesis – capturing and transforming energy from sunlight into chemical energy (glucose)A. Done by green plants and

blue-green algaeB. Autotrophs are able to make their own food with lightC. Sunlight is a form of

radiation or energy

D. Pigment – substance that absorbs light

E. Chlorophyll – photosynthetic pigment (reflects green

light)F. Chloroplast – organelle where

photosynthesis occurs1. Thylakoid – sacs of

membranes in a chloroplast

2. Grana – stacks of thylakoids

3. Stroma – regions between the grana

II. General equation for photosynthesis

6 CO2 + 12 H2O C6H12O6 + 6O2

This is the opposite of aerobic respiration!

Carbon

dioxidewater Sun

light

glucose oxygen

III. The light dependent reactions of photosynthesisA. Take place in the

presence of light (when)B. Takes place in the grana

(where)C. Begin when chloroplasts

absorb light

D. Photosystem II1. Light is absorbed2. Electrons pass to

the electron transport chain

3. Makes ATP

(like the ETC in aerobic respiration!)

E. Photosystem I1. Light is absorbed2. NADP forms

NADPH2 (it is a hydrogen acceptor)

3. Takes electrons from H2O and forms O2 which is released (this is splitting water!)

IV. Summary of Light ReactionsA. Break apart waterB. Forms ATP and NADPH2

C. Releases O2

Journal Entry #April 21, 2023

Explain how oxygen and carbon dioxide leave and enter the plant.

Explain how water enters and leaves a plant.

(use your notes on transport in plants)