Chapter 8

Question 1

Worded equation for photosynthesis

Answer 1

Carbon dioxide + Water > Glucose + Oxygen

Question 2

Balanced symbol equation for photosynthesis

Answer 2

6 Co2 + 6 H2O > C6 H12 O6 + 6O2

Question 3

Plant cell

Answer 3

Nucleus
Chloroplasts
Mitochondria
Cell wall
Vacuole
Ribosomes
Cell membrane

Question 4

What are the chemicals that are the raw materials of the process?

Answer 4

Water and Co2

Question 5

How do these chemicals get to the leaf?

Answer 5

Water via roots, Co2 via stomata.

Question 6

What are the products of the process?

Answer 6

Glucose and oxygen

Question 7

What is the energy source for photosynthesis?

Answer 7

Sunlight

Question 8

How does the leaf absorb this energy?

Answer 8

Chloroplast

Question 9

Why do plants carry out photosynthesis?

Answer 9

Glucose and oxygen for food = growth

Question 10

Leaf adaptations

Answer 10

Broad leaves = Big surface area for light to fall on
Thin leaves= Shorter distance for diffusion
Contain chlorophyll in the chloroplasts = Absorb light
Veins = Water in the xylem and remove the products of photosynthesis in the phloem
Air spaces = Allow Co2 to enter and Oxygen to leave by diffusion
Guard cells = Open and close the stomata to regulate gas exchange

Question 11

Limiting the rate of photosynthesis

Answer 11

• Light intensity
• Water content
• Co2 concentration
• Temperature

Question 12

Glucose

Answer 12

• Respiration
• Amino acids to make proteins eg enzymes
• Fat & oils and starch as an energy store
• Cellulose to strengthen cell wall