Chapter 2 : Lesson 1 Photosynthesis Video (start @ 2.03)

PHOTOSYNTHESIS How Do Living Things Get Energy From the Sun? Read pg. 45 and talk about Figure 1

PHOTOSYNTHESIS Do Laminated Consumer/Producer Activity Go over p44-45 in group Apply It:   

How Do Living Things Get Energy From the Sun? P. 46 Assess Your Understanding (Answer Key) How Do Living Things Get Energy From the Sun? 1a. An organism that makes its own food is a(n) autotroph 1b. Why do living things need energy? To carry out cell functions 1c. Give an example of how energy from the sun gets into your cells.    Sample: Wheat captures the sun’s energy, and I eat bread made from wheat. Got it! Now I know that living things get energy directly from the sun by Photosynthesis, eating producers or other consumers.

The Sun as an Energy Source Photosynthesis – the process where a cell captures energy in sunlight and uses it to make food The food is called glucose

The Sun as an Energy Source Nearly all living things obtain energy either directly or indirectly from the energy of sunlight that is captured during photosynthesis

Producers and Consumers Producers make their own food – also known as autotrophs Consumers don’t make their own food – also known as heterotrophs Many heterotrophs get food from eating other organisms

What Happens During Photosynthesis? During photosynthesis, plants and some other organisms absorb energy from the sun and use it to convert carbon dioxide and water into sugars and oxygen.

What Happens During Photosynthesis?

Takes place in two stages: 1. Plants capture sun’s energy What Happens During Photosynthesis? Takes place in two stages: 1. Plants capture sun’s energy 2. plants produce sugars More detail about both stages on next slide…

Chlorophyll – the main pigment for photosynthesis Stage 1: Capturing the Sun’s Energy Chlorophyll – the main pigment for photosynthesis 1. Chlorophyll captures energy from sunlight a. Happens mostly in leaves

b. Water in the chloroplasts is split into hydrogen and oxygen. Stage 1: Capturing the Sun’s Energy b. Water in the chloroplasts is split into hydrogen and oxygen. c. Oxygen is given off as a waste product d. The hydrogen is used in stage 2

Stage 1: Virtual Lab???

Stage 1: Plants capture sun’s energy Stage 2: plants produce sugars Remember…2 stages of photosynthesis Stage 1: Plants capture sun’s energy Stage 2: plants produce sugars

Photosynthesis What is the process of photosynthesis? Sunlight captured by chloroplasts splits into hydrogen and oxygen Sugars are produced

Cells produce sugars in stage 2 The sugar is glucose – C6H12O6 Stage 2: Using Energy to Make Food Cells produce sugars in stage 2 The sugar is glucose – C6H12O6 Water and carbon dioxide combine chemically to form sugars

Producing Food The second stage of photosynthesis makes food for a plant. How can the information for Stage 1 and Stage 2 be completed? chlorophyll Sunlight Write this: (H2O is split) energy Carbon dioxide sugars

Raw materials - materials needed for the chemical reaction to occur The Photosynthesis Equation Light Energy L 6O2 Light Energy Light Raw materials - materials needed for the chemical reaction to occur (the molecules on left side of equation) 6 molecules of carbon dioxide and 6 molecules of water

Products – compounds that were chemically combined after the reaction The Photosynthesis Equation Light Energy Light Energy 6O2 L Light Products – compounds that were chemically combined after the reaction the molecules on right side of equation 1 molecule of glucose and 6 molecules of oxygen

2a. Circle two products of photosynthesis? Glucose c. Carbon dioxide Assess Your Understanding 2a. Circle two products of photosynthesis? Glucose c. Carbon dioxide Oxygen d. Chlorophyll

Assess Your Understanding 2b. Refer to figure 3 on pg. 48. Where does the hydrogen that is used in Stage 2 of photosynthesis come from? Hydrogen comes from water that is split apart in Stage 1.

Assess Your Understanding c. Would you expect a plant to produce more oxygen on a sunny day or a cloudy day? Explain. vs. On a sunny day; more sunlight would be available for photosynthesis

I get it! Now I know that during photosynthesis… Assess Your Understanding I get it! Now I know that during photosynthesis… Plants absorb energy from the sun and produce sugar (food) and oxygen.

What are the two raw materials of photosynthesis? One more to check What are the two raw materials of photosynthesis? Glucose c. Carbon dioxide Water d. Oxygen