B8 - Photosynthesis

Question 1

Photosynthesis

Answer 1

Carbon dioxide + water → oxygen + glucose

6CO₂ + 6H₂O → 6O₂ + C₆H₁₂O₆

→ = sunlight and chlorophyll

Question 2

Factors affecting the rate of photosynthesis

Answer 2

Light

Temperature

Carbon dioxide concentration

Question 3

Glucose in a plant

Answer 3

Can be stored as starch (in leaves, seeds, roots)

Cellulose strengthens cell walls

Growth and repair for damaged cells or tissues

Used in respiration

Energy stored as sucrose

Question 4

Poly tunnels

Answer 4

Plastic tunnels which cover plants outside

Increases temperature = more photosynthesis

Question 5

Hydroponic growing system

Answer 5

Growing plants without soil, grows in water with mineral ions

Amount of nutrients can be controlled, no shortage of H2O

Question 6

Science lab

Answer 6

One factor of photosynthesis can be changed at a time

We can find out the limiting factors

Question 7

Artificial lighting

Answer 7

Photosynthesis takes place for 244 hours a day

More light = more photosynthesis

Question 8

Features of a leaf

Answer 8

Stalk supplies the leaf with H2O and transports sugars

Midrib supports the leaf

Large surface area = more sunlight absorbed

Thin = higher rate of diffusion