Biology 1.5

• What is photosynthesis

  A chemical reaction controlled by enzymes
• What can affect photosynthesis

  Temperature

  ph
• Word equation for photosynthesis

  light

  Carbon -> water ————>glucose+oxyge

  Chlorophyll
• Were does photosynthesis take place to

  In chloroplast
• Define photosynthesis

  The process in which plants attract sunlight and convert it to glucose
• When do plants produce maximum amount of glucose

  Midday when light intensity is greatest
• What does photosynthesis do

  Brings energy into food chains from the sun
• What are chloroplast filled with

  cholorphyll
• What is the function of chlorophyll during photosynthesis?

  It can absorb light energy which is used to convert carbon dioxide and water into glucose. Plants can use the glucose made for respiration
• What is chlorophyll

  A pigment
• Why is light required for photosynthesis

  Provided the energy required for chemical reactions in photosynthesis
• 2 main stages of photosynthesis

  •chlorophyll absorbs light energy wich is used to split water into oxygen and gas, hydrogen ions

  •carbon dioxide combines with hydrogen ions to form glucose
• What factors affect the rate of photosynthesis

  Temperature

  ph

  ligh intensity

  carbon dioxide concentration
• What can plants use glucose for apart from respiration

  To make cellulose cell walls, proteins and walls
• What is a limiting factor

  A variable that limits the rate of a particular reaction from going faster
• What would happen if you give the plant more of a limiting factor

  The rate of photosynthesis would increase
• What would happen if you continued to give the plant more of a limiting factor

  The factor would turn into a non longer a limiting factor
• Explain how temp affects the rate of photosynthesis

  Finish
• Explain how light intensity affects the rate of photosynthesis

  Finish
• Explain how carbon dioxides concentration affects the rate of photosynthesis

  Finish
• When does temperature become a limiting factor

  When temperature drops too low on a cold winter days
• When does light intensity become a limiting factor

  At night
• When does carbon dioxide concentration become a limiting factor

  Finish
• When a plant carries out photosynthesis what does it produce

  Glucose
• How to tests a leaf

  Boil the leaf to kill it
• how long are leaves kept in the dark for

  24hours to destarch
• How would u know if a plant has been photosynthesised

  It’s leaf will contain starch
• How is the waxy cuticle adapted to its function

  waterproof to reduce water loss
• How is the palisade layer adapted to its function

  It revives most light so it donations the greatest concentration of chloroplast
• What is the structure of the upper epidermis

  Transparent only allowing light to reach the palisade layer
• How is the spongy layer adapted to its function

  Contains many air spaces to allow the diffusion of carbon dioxide to chloroplasts in the palisade layer for photosynthesis
• Describe how the lower eperdims is adapted to its function

  Contains many stomata to allow gas exchange
• What are stomata

  Pores that are found in the lower epidermis of that leaf allow for gas exchange which water vapour passes during transpiration
• What are guard cells

  Specialsed cells surrounding the stomata and is responsible for opening and closing of the stomata
• Function of the both stomata and guard cells

  When a plant has enough water the guard cells will open the stomata to allow gas exchange in the day and prevent water loss at night
• What are the veins


  contains xylem and phloem
• Photo of the leaf structure

  Photo

  
• What is transpiration

  The loss of water vapour from the leave of a plant
• What is xylem 


  Vessels that carry water and minerals through the plant
• What is phloem

  Vessels that carry sugar through plant