Photosynthesis Part 1 & 2

Purpose, and photosynthetic machinery

What is the purpose of photosynthesis

Create glucose in order to turn it into ATP energy (for themselves)

Chemical equation for photosynthesis (reactants & products)

Reactants:

• CO2

• H2O

• Radiant energy (sun)

Products:

• Glucose

• CO2

Similarity between photosynthesis & cellular respiration

Both involve energy transformation

Where does it occur, and why?

The leaves, because of their photosynthetic structure

True or false: Photosynthesis is the only purpose of leaves

True

3 main types of tissue of the leaf

1. Epidermis

2. Mesophyll

3. Vascular tissue

What is the function of the stomata

It is a pore that brings in CO2

True or false: The stoma regulates what goes in and out od the leaf and conserves water

False, The guard cells do

True or false: Hypotonic causes the guard cell to deflate

False, it causes it to inflate

True or false: Hypertonic causes the guard cell to deflate

True

What is the purpose of the epidermis layer? (3)

• Protection

• Regulates what comes in and out by producing wax

• Keeps water & CO2 in

What is the purpose of the vascular bundle? (2 types)

• Transport system of the plants

  1. Contains xylem (water transport)

  2. phloem (sugar transport)

True or false: Xylem transports water up from the roots

True

True or false: Phloem transports sugar from leaves to the roots

True

True or false: Most photosynthesis occurs in the vascular bundle

False, it occurs in the mesophyll

Name the two layers of mesophyll and their purpose

1. Paliside mesophyll -

Absorbes more sunlight because it is close together

2. Spongy mesophyll -

Creates concentration gradient of CO2

Why are there spaces between the 2 layers of mesophyll

For gas exchange, concentration gradient of CO2 (diffusion)

Where do all photosynthetic reactions take place?

In the chloroplast

True or false: chlorophyl is a molecule that captures light energy

True

What is a light reaction

Reaction that needs direct sunlight

Whats a dark reaction

Does not need direct sunlight

Why are dark reactions important?

They convert ATP energy into a longer lasting source of energy otherwise it will go bad

True or false: Light is not needed in photosynthesis, explain why

False, It’s needed in order to excite electrons and generate ATP

True or false: green is the least colour absorbed by the pigments in thylakoid

True, it absorbes everyother colour which is why we can only see the green on a leaf