Photosynthesis

Photosynthesis

Biology 1

​Learning Target:

Identify the reactants, products, and basic functions of photosynthesis.

Multiple Choice

What is the source of energy for plants to make food?

• Animals

• The moon

• The sun

• Chemicals

​Purpose of Photosynthesis

Chemical reaction using light energy (sunlight) to convert water and carbon dioxide into oxygen and carbohydrates (glucose, sugar).

Carbohydrates = quick energy, sugars (plant food!)

Photosynthesis Equation

​Reactants

Products

Multiple Choice

Which of the following are the reactants of photosynthesis?

• O₂ + Glucose(sugar)

• CO₂ + O₂

• CO₂ + Glucose(sugar)

• CO₂ + H₂O

Multiple Choice

Which of the following are the products of photosynthesis?

• O₂ + Glucose(sugar)

• CO₂ + O₂

• CO₂ + Glucose(sugar)

• CO₂ + H₂O

Leaves are the major food-producing organs of plants.
Designed to "catch" the sunlight This means they are the main site of photosynthesis

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​On the leaf diagram provided, add in arrows and substances showing where the reactants come from and where the products go.

Photosynthesis occurs in chloroplasts.

• Plants, algae, some protists, and some bacteria use photosynthesis to create their sugars/food.

* Takes place in prokaryotic cell membrane since they lack chloroplasts.

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Why are plants green?

​The color green found in many plants leaves comes from chlorophyll molecules.

Chlorophyll is a green pigmented light-absorbing molecule, that captures the solar energy from the sun.

Multiple Choice

What structure allows carbon dioxide to enter a plant and oxygen to leave during photosynthesis?

• Roots

• Flowers

• Stomata

• Vascular bundle

Multiple Choice

How does most of the water needed by the plant get into its leaves?

• The roots absorb it and then it travels up the stem

• It enters through the stomata

• It's made during a chemical reaction in the leaf

• The flowers capture water and deliver it to the leaves

Open Ended

Why does photosynthesis occur only during the day in most plants?

Open Ended

How do plants help reduce the amount of carbon dioxide in the atmosphere?