Photosynthesis in plants

Question 1

what is the Equation for photosynthesis

Answer 1

6CO2 + 6H2O –> C6H12O6 + 6O2

Question 2

What are the 4 uses of Glucose?

Answer 2

1. In respiration releasing energy.
2. Can be converted into cellulose to make cell walls.
3. Can be used to make proteins for growth and repair.
4. Can be converted into starch, fats and oils for storage.

Question 3

Why can starch be used for storage?

Answer 3

It is insoluble.

Question 4

Why is glucose not good for storage?

Answer 4

It can affect the water concentration of cells and cause osmosis.

Question 5

Explain the 3 stages of photosynthesis

Answer 5

Step 1. Water H20 is split up by the sunlight
Step 2. This releases oxygen and hydrogen ions
Step 3. Carbon dioxide combines with hydrogen ions forming Glucose and water.

Question 6

What are the 3 Limiting Factors of Photosynthesis

Answer 6

1. Light
2. Carbon Dioxide
3. Temperature

Question 7

What is a limiting factor

Answer 7

Something that limits the rate at which photosynthesis can take place is called limiting factor. When it levels of on the graph it is the limiting factor as it is lacking.

Question 8

What is the Wax Cuticle

Answer 8

A layer that protects the leaf without blocking any sunlight.

Question 9

Outer Epidermis adaptions and purpose

Answer 9

Transparent because it lacks chloroplast, they allow light to get to the palisade layer and not become an obstacle to light to get around.

Question 10

Upper palisade layer adaptations and purpose

Answer 10

Contains most chloroplast because it is the place where most of the sunlight will be received it allows all the light to be absorbed.

Question 11

The Spongy mesophyll cells

Answer 11

Loosely packed so there is alot of air space.

1. Allows the diffusion between the cells and the atmosphere to happen
2. Also creates a large surface area to volume ratio this means large amounts of gases can enter and leave the cells

Question 12

Why is the leaf broad?

Answer 12

To maximise surface area so they can get in as much light as possible.

Question 13

Why is the leaf thin?

Answer 13

1. So gases can diffuse through easily

2. So light can get to all cells

Question 14

Why do leafs contain a variety of pigments?

Answer 14

So they can get all the light from a broad range of the light spectrum.

Question 15

Why to the leaves have loads of vascular bundles

Answer 15

This allows efficient transport of chemicals like water and glucose

Question 16

Why do they have specialist Guard Cells

Answer 16

These control the opening and the closing of the stomata, thus regulating the flow of c02 and 02 and water loss.

Question 17

When the Stomata is open the guard cells are…

Answer 17

Full of water and are turgid.

Question 18

When the stomata is closed…

Answer 18

Guard cells lose water and become flaccid. They would normally only close when it is dark when no carbon dioxide is needed for photosynthesis.