Photosynthesis

Question 1

What is photosynthesis?

Answer 1

The process where plants and algae produce glucose

Question 2

Where, in a plant, does photosynthesis occur?

Answer 2

The leaves

Question 3

Where, in the leaf, does photosynthesis occur?

Answer 3

Inside chloroplasts

Question 4

What is chlorophyll?

Answer 4

Green substance inside chloroplasts

Question 5

How does chlorophyll photosynthesise?

Answer 5

Absorbs sunlight and uses its energy to convert carbon dioxide and water, into glucose (and oxygen as a by-product)

Question 6

What is the word equation for photosynthesis?

Answer 6

Carbon Dioxide + Water —> Glucose + Oxygen

Question 7

What are the limiting factors of photosynthesis?

Answer 7

Intensity of light
Temperature
Volume/Concentration of CO2

Question 8

What is a limiting factor (regarding photosynthesis)?

Answer 8

Something stopping photosynthesis happening faster

Question 9

What is the limiting factor at night?

Answer 9

Light

Question 10

What is the limiting factor in winter?

Answer 10

Temperature

Question 11

What is the limiting factor if it’s warm and bright enough?

Answer 11

CO2

Question 12

Why does the rate of photosynthesis decrease around 45*?

Answer 12

Enzymes are destroyed

Question 13

How do farmers artificially create ideal environment for photosynthesis?

Answer 13

Greenhouses

Question 14

When might a farmer use a heater?

Answer 14

Winter

Question 15

When might a farmer use shades or ventilation?

Answer 15

Summer

Question 16

When do farmers use artificial light?

Answer 16

At night

Question 17

How would a farmer increase CO2 in a greenhouse?

Answer 17

Paraffin heater (releases CO2 as a by-product)

Question 18

Why do farmers add fertiliser to soil?

Answer 18

Provide plant with all the minerals needed for healthy growth

Question 19

What are the 5 ways plants use glucose?

Answer 19

Respiration, Making cell wall, Proteins, Stored in seeds, Stored as starch

Question 20

Why do plants respire?

Answer 20

Release energy and enable em to convert rest of glucose into useful substances so they can build/grow cells

Question 21

How does glucose make cell walls?

Answer 21

Glucose is converted into cellulose for making strong cell walls

Question 22

How does glucose make proteins?

Answer 22

Combined with nitrate ions (from soil) to make amino acids, which are made into proteins

Question 23

How is glucose stored in seeds?

Answer 23

Glucose is turned into lipids (fats and oils)

Question 24

How does the plant use starch?

Answer 24

For use when photosynthesis isn’t happening (winter)

Question 25

Why is glucose stored as starch?

Answer 25

It’s insoluble - a cell with lots of glucose would absorb loads of water and swell

Question 26

Where is starch stored?

Answer 26

Roots, Stems and Leaves