Bioenergentics

Question 1

The word equation for photosynthesis is

Answer 1

Carbon dioxide + water (with light energy)= glucose + oxygen

Question 2

The symbol equation to photosynthesis is

Answer 2

6CO2 + 6H2O → C6H12O6 + 6O2

Question 3

Where does photosynthesis take place

Answer 3

In chloroplasts

Question 4

What type of reaction is photosynthesis

Answer 4

Endothermic

Question 5

Which molecule has the symbol C 6 H 12 O 6

Answer 5

Glucose

Question 6

What are the limiting factors that affect the rate of photosynthesis

Answer 6

Light intensity, concentration of CO2 and temperature

Question 7

What else is a limiting factor of photosynthesis

Answer 7

The amount of chlorophyll in the plant

Question 8

What are the five ways plants use glucose?

Answer 8

For respiration
Making cellulose
Making amino acids
Stored as oils or fats
Stored as starch

Question 9

The three important graphs for the rate of photosynthesis are

Answer 9

1. Not enough light slows down the rate of photosynthesis
2. Too little carbon dioxide also slows it down
3. The temperature has to be just right

Question 10

What happens when the light intensity increases steadily?

Answer 10

It will reach a point where the rate won’t increase because either the CO2 or the temperature levels are too low which is now the limiting factor same for CO2 aswell

Question 11

What’s the usual reason why temperature is the limiting factor

Answer 11

This is because the temperature is too low and the enzymes needed to work more slowly at lower temperatures

Question 12

What happens when the temperature is too hot?

Answer 12

The enzymes needed get damaged this usually happens at 45 degrees

Question 13

Whats the practical that measures the affect of light intensity on the rate of photosynthesis

Answer 13

The Canadian pondweed experiment

Question 14

What is the first step to the pondweed experiment

Answer 14

1. Place a light at a certain distance away from the pond weed

Question 15

What is the second step to the pondweed experiment

Answer 15

Leave the pondweed to photosynthesis for a set amount of time then collect the oxygen released in a capillary tube

Question 16

What is the the 3rd step of the pondweed experiment

Answer 16

At the end you use the syringe to draw the gas bubble in the tube up along a ruler and the length of the bubble is measured (it’s proportional to the volume of oxygen produced)

Question 17

What’s the final step to the pondweed experiment

Answer 17

Repeat it again to confirm then repeat with different light intensity levels

Question 18

What does the xylem do

Answer 18

Transports water and minerals up a plant

Question 19

What does the phloem do

Answer 19

Transports sucrose and amino acids

Question 21

What cells are found at the top and bottom of a leaf

Answer 21

Epidermal cells

Question 22

Name an adaptation of the upper epidermis

Answer 22

It’s transparent and allows light to pass through

Question 23

What’s the thin layer of oily material called on the upper epidermis

Answer 23

Waxy cuticle

Question 24

What does the waxy cuticle do

Answer 24

Reduces the evaporation of water

Question 25

Where is the stomata located

Answer 25

In the lower epidermis

Question 26

What does the stomata do

Answer 26

Allow carbon dioxide to enter the leaf and oxygen to leave

Question 27

Where in the leaf is the palisade mesophyll located

Answer 27

The top of the lead

Question 28

Why are palisade cells filled with chloroplasts

Answer 28

So the chlorophyll inside the chloroplast absorb the light energy needed for photosynthesis