B8: Photosynthesis

Question 1

What is the waxy cuticle?

Answer 1

-A water proof, protective layer

Question 2

What is the upper epidermis?

Answer 2

• Transparent layer to allow maximum light for photosynthesis
• One cell thick

Question 3

What is the pallisade mesophyll layer?

Answer 3

• Layer of tightly packed cells

- Contains most chloroplasts, so most of photosynthesis occurs here

Question 4

What is the spongy mesophyll layer?

Answer 4

• Layer with lots of airspace to make diffusion more efficient
• They have a large surface area

Question 5

What is the lower epidermis?

Answer 5

-Layer made up of epidermal cells and guard cells

Question 6

What is a guard cell?

Answer 6

-Controls the opening and closing of the stoma

Question 7

What is stomata?

Answer 7

• Where gases diffuse in and out of the cell

- Like a “pore”

Question 8

What is airspace?

Answer 8

• Empty space in the cell

- Allows for diffusion

Question 9

What is a xylem vessel?

Answer 9

-Transports water and mineral ions from the roos to the leaves

Question 10

What is a phloem vessel?

Answer 10

-Transports glucose from the leaf to other parts of the plants in the form of sucrose

Question 11

What is th name of the xylem and phloem vessels together?

Answer 11

Vascular Bundle

Question 12

What are chloroplasts?

Answer 12

-Contains chlorophyll, which traps energy from sunlight for photosynthesis

Question 13

What is an endothermic reaction?

Answer 13

A reaction which takes in heat energy

Question 14

What is the word equation from photosynthesis?

Answer 14

Carbon dioxide + water —-> Glucose + Oxygen

Question 15

What is the symbol equation for photosynthesis?

Answer 15

6 CO2 + 6 H2O —–> C6 H12 O6 + 6 O2

Question 16

How is water taken into the plant?

Answer 16

Water enters the root hair cells via osmosis from a high concentration in the soil to a low of concentration in the plant.

Question 17

In what form is glucose stored?

Answer 17

Starch

Question 18

In what form is glucose transported as?

Answer 18

Sucrose

Question 19

What does a plant use glucose for?

Answer 19

• Growth
• Make other carbohydrates, e.g. cellulose
• Make fats and oils
• Make amino acids, which turn into proteins

Question 20

What is some of the waste oxygen from photosynthesis used for?

Answer 20

Respiration

Question 21

How does oxygen leave the plant?

Answer 21

It diffuses out of the stoma from a high concentration in the plant to a low concentration in the atmosphere

Question 22

What is an inverse relationship?

Answer 22

When one variable increases/goes up, the other decreases/goes down

Question 23

What is the equation for light intensity in relation to distance?

Answer 23

Light Intensity is inversely proportionate to 1/d’2

Question 24

What is the Inverse Square Law?

Answer 24

As distance increases, light intensity decreases

Question 25

How does Inverse Square Law relate to photosynthesis?

Answer 25

As distance from the light source increases, photons of light become spread over a wider area.

Question 26

When calculating light intensity, what is the independent variable?

Answer 26

Distance from light source to plant (cm/m)

Question 27

When calculating light intensity, what is the dependent variable?

Answer 27

-Number of bubbles per min
OR
-Amount of oxygen produced (cm)

Question 28

When calculating light intensity, what are some control variables?

Answer 28

• Volume of water in the beaker/tube
• Concentration of Carbon Dioxide
• Size/Species of plant
• Light source
• Light colour
• pH