Photosynthesis Lesson

Biology

Unit 11: Energy Conversions in Organisms

Lesson 1: Photosynthesis

Teacher Facing

January 7, 2025

17

Lesson Vocabulary

Photosynthesis

Reactants

Products

Plants use light energy to convert water
and carbon dioxide (reactants) into
high-energy sugars and oxygen
(products).

The starting substances that
undergo chemical changes in a
reaction to form new substances.

The substances that are formed as a
result of a chemical reaction.

18

LO:

SWBAT explain how matter is conserved and energy is
transferred during photosynthesis using models, including
the chemical equations for this process.

DOL:Given a set of problems, students will explain how matter

is conserved and energy is transferred during
photosynthesis using models, including the chemical
equations for this process, by answering at least 4 of 5
questions correctly.

B.11 (A) Explain how matter is conserved and energy is transferred during photosynthesis and cellular respiration using models, including the

chemical equations for these processes.

Photosynthesis

23

Read the information
about the plant leaf and
click on the leaf to learn
more. Answer the
question on your SA
handout.

Interactivity: Model of Photosynthesis

What is the

function of a

leaf?

Multiple Choice

What is the function of a leaf?

• To absorb water and nutrients from the soil

• To produce food for the plant through photosynthesis

• To anchor the plant in the ground

• To transport water and minerals throughout the plant

24

Read the information
about the plant cell and
click on the cell to learn
more. Answer the
question on your SA
handout.

Interactivity: Model of Photosynthesis

What is the

function of a

chloroplast?

Multiple Choice

What is the function of the chloroplast?

• To store water and nutrients for the plant

• To produce energy through cellular respiration

• To capture sunlight and convert it into energy through photosynthesis

• To transport water and minerals throughout the plant

25

Read the information
about the chloroplast
and draw a chloroplast
in the space provided
on your SA handout.

Interactivity: Model of Photosynthesis

What pigment is

found in the

thylakoid

membranes?

26

CFU: Model of Photosynthesis

Complete the sentences using the following words: chlorophyll, leaf, chloroplasts, thylakoids

The part of plants that contains structures needed to
absorb sunlight and carbon dioxide is the ______.

The cells inside this structure contain many green
organelles called __________________.

Inside each of these organelles are stacks of
__________ that contain the green pigment

______________ that absorbs sunlight needed to
power the light-dependent reactions of photosynthesis.

27

Stages of Photosynthesis

Photosynthesis involves two sets of reactions:

● Light-dependent reactions
● Light-independent reactions

28

Light-Dependent Reaction

What happens during the light-dependent reaction?

Multiple Choice

What are the reactants in light-dependent reactions?

• Oxygen, water, and sunlight

• Carbon dioxide, minerals, plant food

• Minerals, water and oxygen

• Water (H2O), sunlight,

29

Light-Independent Reaction

What happens during the light-independent reaction?

Match

Match the following for Light-independent reactions

• Reactants

• Products

• Energy-Powering Molecules

Carbon Dioxide

Sugars

ATP & NADPH

• Carbon Dioxide

• Sugars

• ATP & NADPH

1. In what part of the cell do light-dependent
reactions of photosynthesis take place?

33

Choose one word or phrase from the bank below to answer the following questions.

2. Which of these is an output of the
light-independent reaction?

3. In the overall organization of a plant, which is the smallest
unit that contains all the materials needed to conduct
photosynthesis?

Bank: Cell, Chloroplast, Glucose, ATP, Mitochondria, Thylakoid
membranes

Hotspot

In what part of the cell do light-dependent
reactions of photosynthesis take place?

38

The process of ___________ carries out the
__________ of glucose through the _____ of energy
stored in the sun.

Word bank: breakdown, photosynthesis, enzymes, cellular respiration,
production, oxygen, use.

Fill in the blanks from the word bank.

Justify your answer

1

2

3

Drag and Drop

The process of ​

Placeholder

carries out the
​

Placeholder

of glucose through the ​

Placeholder

of energy
stored in the sun.Word bank: breakdown, photosynthesis, enzymes, cellular respiration,

Drag these tiles and drop them in the correct blank above

photosynthesis

production

use

oxygen

enzymes

40

Check For Understanding

What type of energy is needed for photosynthesis to
take place?

A. Radiant energy from the sun
B. Chemical energy from animals
C. Mechanical energy from work
D. Chemical energy from glucose

Radiant =

Light

41

Key Ideas: Photosynthesis

What is the role of the following during photosynthesis:

● Chloroplast

The organelle where photosynthesis takes
place.

42

Key Ideas: Photosynthesis Cont’d

What is the role of the following during photosynthesis:

● Chlorophyll

The pigment contained in the chloroplast
that captures sunlight which is needed to
carry out photosynthesis

43

Making Analogies

45

Key Ideas: Photosynthesis

Photosynthesis uses the energy of sunlight to convert water
and carbon dioxide (low-energy reactants) into high-energy
sugars and oxygen (products).

Carbon dioxide + Water → Sugars + Oxygen

6CO2 + 6H2O → C6H12O6 + 6O2

Multiple Choice

Maya reads about the role of chlorophyll in photosynthesis and learns that it captures light
energy, enabling the plant to produce glucose.

PART A:
What role does chlorophyll play in the transfer of energy during photosynthesis?

• Chlorophyll absorbs carbon dioxide for energy transfer.
• Chlorophyll releases oxygen to produce glucose.
• Chlorophyll captures light energy, enabling the plant to produce glucose.
• Chlorophyll stores energy in the roots of the plant.

Multiple Choice

Why is this energy transfer significant for the plant’s survival?

• It stores energy in glucose, which the plant uses to grow and perform other

• It directly provides the plant with oxygen for respiration.

• It allows the plant to produce energy without sunlight.

51

The chemical equation for photosynthesis is shown.

6CO2 + 6H2O C6H12O6 + 6O2

What energy transfer occurs during photosynthesis?

A.

Solar energy gets transferred to the carbon dioxide to drive the
process.

B.

Energy in the water molecules is transferred to the glucose molecule.

C.

Oxygen gets converted into carbon dioxide to release energy.

D.

Solar energy gets transferred to the chemical energy stored in glucose.

E.

The chemical energy stored in glucose is transferred to ATP.

Let’s Practice!

light energy