Topic 4 - Photosythesis Flashcards
(15 cards)
Why does the leaf have a large surface area?
Reduces distance gas and light has to travel to reach the centre of the leaf
Why is the leaf thin?
Gasses diffuse through the leaf quicker
Why is the epidermis is transparent and has no chloroplasts?
Leaf can absorb as much sunlight as possible
Why is there stomata in the leaf?
Cells with moveable chloroplasts can absorb sun light energy optimally
Why are there many chloroplasts in the palisade mesophyll cells that move?
Water can be easily carried by other parts of the plant
What doe photosynthesis do?
Converts water and carbon dioxide into glucose and oxygen
What is an anabolic process?
Small simple molecules are built up into large complex molecules
What happens to the excess glucose?
Converted into starch which stores energy until the plant needs it
What are the requirements for photosynthesis to occur?
Sunlight energy Carbon dioxide Water Chlorophyll Enzymes
Explain the process of the light phase
Light energy reaches chlorophyll in the Grand and converts it to chemical energy. Converts adp into atp. Breaks up water through photolysis into high hydrogen and oxygen.
Explain the light independent phase
Carbon dioxide atp and hydrogen in the stroma are used to make glucose and other organic compounds
Name 3 things we need photosynthesis for
The release of oxygen
Uptake of carbon dioxide
Production of food
Why do plants grow slowly during the winter?
Enzymes need warm conditions to warm but not too warm in the winter when it’s cold enzymes are inactive.
Why do plants grow faster in summer
Enzymes work best at their optimum temperature but when it’s too hot they denature
What’s the difference between phosphorylation and dephosphorylation?
Phos - add a phosphate group to a molecule
Dephos - remove phosphate group from a molecule
