Chapter 8: Photosynthesis

Energy Energy= Chemical Energy:____________ ___________ –Sugar= – = C 8 H 18 all organisms must release energy that is in sugars and other compounds

How Cells Store & Release Energy Cells use chemical compound- _______________ ____________________ (_______) to store/release ________ amounts of energy ATP= – _______________________ are key to energy storage & release

Storage to Release: ADP vs. ATP ADP – ___________ _______________ – –Ribose –______ Phosphate groups Similar to _______, but only ____ phosphates

Storage to Release: ADP vs. ATP Cell can store small amounts of energy by __________ a phosphate group to _______ Energy is ___________ from ________ when it is converted to _________ and a __________ group –

Using Biochemical energy Cells use energy provided by ATP Examples: –Active transport sodium-potassium pumps –Powers movement of cell

ATP & Glucose ATP not good for storing large amounts of energy or for long term storage –_____ sugar molecule= ________ energy of 1 ATP More efficient to use sugar for energy storage & to reenergize ADP into ATP using sugar (glucose)

8-2 Photosynthesis: An Overview

Investigating Photosynthesis: Van Helmont, Priestley, Igenhousz

Photosynthesis Photosynthesis-

The Photosynthesis Equation Sunlight’s energy converts water and CO 2 into oxygen & high energy sugars in chloroplasts

Photosynthesis: Reactants and Products + H 2 O + O 2 Section 8-2

Light & Pigments Energy from sun travels in form of light –White color= mixture of different wavelengths Wavelengths visible to eyes =_________________ ____________

Light & Pigments Pigments- –“light ______________ = color seen” Chlorophyll- principal plant pigment –2 types- Chlorophyll _____ & Chlorophyll ____ Carotene-

Figure 8-5 Chlorophyll Light Absorption Absorption of Light by Chlorophyll a and Chlorophyll b Chlorophyll b Chlorophyll a Section 8-2

Light & Pigment Because light is a form of energy a compound that __________ light also ______________ energy Chlorophyll transfers most of energy absorbed to ________________ in chlorophyll molecule –Raising energy levels of _____________