Photosynthesis & Cellular Respiration

Photosynthesis & Cellular Respiration

What is Photosynthesis?

• The process by which a cell captures the energy in sun­light and uses it to make food

  
  

• Photosynthesis takes place in two stages: cap­turing the sun's energy and producing sugars.

Capturing the Sun's Energy

• This energy-capturing process occurs in the leaves and other green parts of the plant.

• Chloroplasts are green organelles inside plant cells. In most plants, leaf cells contain more chloroplasts than other parts of the plant

• Chloroplasts capture the light energy and use it to power the second stage of photosynthesis.

Using Energy to Make Food

• The cell needs two raw ingredients for this stage: water (H₂O) and carbon dioxide (CO₂) 

• Plant roots absorb water from the soil. The water then moves up through the plant’s stem to the leaves

• Carbon dioxide is one of the gases in the air. Carbon dioxide enters the plant through small openings on the underside of the leaves

Multiple Select

What are the raw ingredients (reactants) needed for photosynthesis? (choose all that apply)

• water

• milk

• carbon dioxide

• oxygen

• chocolate

Products of photosynthesis

• Glucose (C₆H₁₂O₆)

• Oxygen (O₂)

Multiple Select

What are the products that are produced during photosynthesis? (choose ALL correct answers)

• carbon dioxide

• glucose

• m&ms

• oxygen

• sunlight

What happens to the GLUCOSE?

• Plant cells use some of the sugar for food.

•  Other sugar molecules may be stored in the plant's cells for later use. When you eat food from plants, such as potatoes or carrots, You are eating the plant's stored food. 

Multiple Choice

Plant cells use some of the glucose they make for food.

• True

• False

What happens to the OXYGEN?

• The other product of photosynthesis is OXYGEN.

• Most of the oxygen passes out of the plant and into the air.

PHOTOSYNTHESIS FORMULA

Cellular Respiration

• Cells break down simple food molecules such as  GLUCOSE and release the ENERGY they contain.

• Cells of all living things carry out cellular respiration continuously.

Two Stages of Cellular Respiration- Stage 1

• First stage happens in the cyto­plasm where glucose molecules are broken down into smaller molecules.

• Oxygen is NOT needed in this stage of respiration

• Only a small amount of the energy is released during this stage.

Two Stages of Cellular Respiration- Stage 2

• Second stage of respiration takes place in the mitochon­dria. There, the small molecules are broken down into even smaller molecules.

• These chemical reactions DO require OXYGEN

• LOTS of energy is released.

Multiple Select

What are the RAW MATERIALS (Reactants) needed for Cellular Respiration? (Choose ALL correct answers)

• glucose

• oxygen

• carbon dioxide

• energy

• ice cream

Products of Respiration

• Carbon Dioxide (CO₂)

• Water (H₂O)

• ENERGY

Multiple Select

What are ALL the products of Cellular Respiration?

• Energy

• Water

• Glucose

• Carbon dioxide

• Pop Tarts

Opposite processes

• During photosynthesis, carbon dioxide and water use light energy to produce glucose and oxygen.

• During respiration, glucose and oxygen are used to produce carbon dioxide, water and ENERGY.

Fun Fact

• Some cells are able to obtain energy from food without using oxygen.

• Some single celled organisms live where there is no oxygen, such as deep in the ocean or in the mud of lakes and swamps

•  Fermentation is the process that provides energy for cells without using oxygen