Photosynthesis Lesson

Photosynthesis
Unit 6

​.

Energy and Life

Living things need energy. It takes plenty of energy to play soccer or even sleep. Without the ability to get and use energy, cells would die. Living things use chemical energy known ATP to maintain homeostasis. Photosynthesis is the process that converts and creates energy.

Multiple Choice

What is the purpose of photosynthesis?

• to grow

• to create energy

• to get oxygen for respiration

BIG IDEA: How Do Living Things Depend on each other? 

• When one organism eats another, molecules are metabolized and energy is transferred.

• Therefore, energy flows through an ecosystem.

• All the food on this earth is made by utilizing solar energy.

• Therefore, the sun is the ultimate source of enegy for all living organisms.

Multiple Choice

What is the primary source of energy for most food chains?

• soil nutrients

• water

• sunlight

• Fossil Fuels

Grouping organisms on how they obtain energy

An autotroph is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals. Because autotrophs produce their own food, they are sometimes called producers.

Grouping organisms on how they obtain energy

Heterotrophs will get energy from other organisms by consuming them. Also called consumers.

• Decomposers are heterotrophs because they break down and feed on the remains of dead organisms . Then, they release simple inorganic molecules back to the environment.​

Multiple Choice

Which of the following would be an autotroph or producer?

• deer

• sunflower

• mushrooms

• leopards

Multiple Choice

Which of the following would be a heterotroph or consumer?

• Dolphin

• Grasses

• Seaweeds

Photosynthesis

• The process by which autotrophs use the energy of sunlight to produce high energy carbohydrates

• 2 stages: light reactions and Calvin Cycle

• Photosynthesis will occur in the Chloroplast.

Multiple Choice

The organelle responsible for carrying out photosynthesis is

• chloroplast

• autotrophs

• water

• mitochondria

Multiple Select

What are the reactants of photosynthesis? Check all that apply.

• ATP

• CO2

• H2O

• O2

Multiple Choice

What are the products of photosynthesis?

• oxygen and energy

• carbon dioxide and glucose

• glucose and oxygen

• oxygen and water

Structures

• Chloroplast: organelle in plants

• Thylakoids: flattened sacs inside the chloroplast

• Grana: flattened sacs inside chloroplast

• Stroma: Solution surrounding grana

Multiple Choice

The solution inside the chloroplast is known as

• thylakoids

• grana

• stroma

Light Reactions of Photosynthesis

• This is the 1st stage of photosynthesis.

• It will require light and water.

• Will take place in the thylakoids of the chloroplasts.
  

Multiple Choice

Light reactions occur in the ______________________of the chloroplast

• thylakoids

• stroma

• outer membrane

Light Reactions

• Light and water come into thylakoid

• Water is split and oxygen is released.

• H+ moves through photosystem II and I building up charges

• + (Protons) goes through ATP synthase and yields 2 ATP and 2 NADPH. (They go to the stroma) 

Multiple Choice

What gas is produced in the light reactions?

• carbon dioxide

• oxygen

• nitrogen

Chlorophyll and Carotenoids

• Pigments are substances that absorb specific wavelengths of light (colors) and reflect others.

• Chlorophyll is the main pigment in photosynthesis.

• Carotenoids are accessory pigments that absorb light

• Both are found in the thylakoids of the chloroplast.

Multiple Choice

What is the primary pigment involved in photosynthesis?

• chlorophyll

• carotenoids

• chloroplast

Calvin Cycle

• Light independent "dark reactions"

• Takes place in the stroma

• ATP and NADPH will be the energy to have CO2 combine with RuBisCO which then becomes glucose

Multiple Choice

In the Calvin cycle, the end result is

• water

• sugar (glucose)

• oxygen

• carbon dioxide

Poll

How do we feel about today's lesson?

• Photosynthesis is easy!

• I just need more practice

• Photosynthesis is difficult. I will come in for extra help.