3 Lesson: BIO.A.3.1 Photosynthesis

Photosynthesis

Carbon dioxide + water (and light ) ———> glucose and oxygen

WHERE DOES PHOTOSYNTHESIS HAPPEN?

• Photosynthesis takes place in chloroplast

• Contain a substance called chlorophyll

• Chlorophyll reflects green light giving plants their green color

Four Steps

• Step 1: absorption of light by chlorophylls , used to break water (H₂0) -->(4H⁺ and 4 e^- and O₂)

• Step 2: The electron transport leading to the reduction of NADP+ to NADPH

• Step 3: Generation of ATP

• Step 4: Conversion of CO₂ into carbohydrates (sugar) (Calvin Cycle or Carbon Fixation)

Carbon fixation

• A CO₂ molecule combines with a five-carbon acceptor molecule, ribulose-1,5-bisphosphate (RuBP). This step makes a six-carbon compound that splits into two molecules of a three-carbon compound, 3-phosphoglyceric acid (3-PGA). This reaction is catalyzed by the enzyme RuBP carboxylase/oxygenase, or rubisco

• End results is Sugar

Multiple Choice

Where does the Calvin Cycle occur?

• thylakoid

• stroma

• lumen

• mitochondria

Multiple Choice

Most plants appear green because chlorophyll

• absorbs green light.

• absorbs violet light.

• does not absorb green light.

• does not absorb violet light.

Multiple Choice

Where do the light-dependent reactions occur?

• thylakoid membrane

• stroma

• mesophyll

• mitochondria

Multiple Choice

Plants need carbon dioxide from their environment to produce glucose during which stage of photosynthesis? 

• The light-dependent stage
• The light-independent stage (The Calvin Cycle)
• The electron transport chain
• ATP formation

Multiple Choice

Why do plants conduct photosynthesis?

• To make light
• To make mitochondria
• To make glucose
• To release carbon dioxide

Multiple Choice

Which organelle stores water for use in photosynthesis?

• Chloroplast

• Cell Membrane

• Vacuole

• Nucleus

Multiple Choice

Which stage of photosynthesis is controlled by enzymes?

• Light Reactions

• Carbon Fixation

Multiple Choice

Organisms that make their own food

• Autotrophs

• Autonomous

• Heterotrophs

Multiple Choice

Where does photosynthesis take place?

• The leaves.
• The roots.
• The branches.
• The kitchen.

Multiple Choice

Where does a plant get carbon dioxide from?

• A plant gets carbon dioxide from the soil.
• A plant gets carbon dioxide from the air.
• A plant gets carbon dioxide from the water.
• A plant gets carbon dioxide at the Shell gas station.

Multiple Choice

The energy released from sugar was once energy from what?

• The energy from sugar was once energy from water.
• The energy from sugar was once energy from the air.
• The energy from sugar was once energy from the sun.
• The energy from sugar was once energy from an iPad battery.

Multiple Choice

During photosynthesis, what form does the food take?

• The food takes the form of sugar.
• The food takes the form of carbon dioxide.
• The food takes the form of soil.
• The food takes the form of a ham sandwich.

Multiple Choice

What does chlorophyll capture?

• Chlorophyll captures water from the air.
• Chlorophyll captures carbon dioxide from the air.
• Chlorophyll captures the energy of sunlight.
• Chlorophyll captures baseballs.

Multiple Choice

What does a plant release into the air?

• Plants release carbon dioxide into the air.
• Plants release sugar into the air.
• Plants release oxygen into the air.
• Plants release bacon into the air.

Multiple Choice

What is the name of the green pigment inside plants?

• Monophyll
• Chlorophyll
• Epiphyll
• Glorophyll

Multiple Choice

Which plant part collects the sun's energy and makes food?

• Leaf
• Stem
• Roots
• Flower

Multiple Choice

Which plant part absorbs water and nutrients?

• Leaf
• Stem
• Roots
• Flower

Multiple Choice

What two products does a plant make during photosynthesis?

• Water and Glucose
• Oxygen and Glucose
• Oxygen and Water
• CO₂ and Glucose

Multiple Choice

What three things are needed for a plant to do photosynthesis?

• Glucose, Oxygen, Sunlight
• CO₂, Oxygen, Sunlight
• CO₂, Water, Sunlight
• Oxygen, Water, Sunlight

Multiple Choice

What gas goes into the plant before photosynthesis?

• Carbon Dioxide
• Carbon Monoxide
• Oxygen
• Nitrogen