Photosynthesis

• ways of reducing the negative effects of human activity on our ecosystems.

  Protecting rare species

  breeding programmes

  regeneration
• Give three ways in which plants use the glucose made in photosynthesis.

  Respiration

  to make cellulose

  to make protein
• Explain why single-celled organisms, like algae, do not need complex structures for gas exchange.

  It has a large surface area to volume ratio and has a short diffusion distance and cell membrane is sufficient
• Suggest how scientists can use this plant to produce many plants with the TMV-resistant gene.

  Take cells from meristem
• A gardener wants to add compost to the soil to increase his yield of strawberries. The gardener wants to make his own compost.  An airtight compost heap causes anaerobic decay. Explain why the gardener might be against producing compost using this method.

  
  

  Methane is produced which is a greenhouse gas
• Plants need energy to make glucose. How do plants get this energy?

  Light is trapped by chlorophyll
• reasons strawberries decay

  high temperature

  more oxygen

  more water
• Plants can use the glucose they have made to supply them with energy. Give other ways in which plants use the glucose they have made.

  To make:

  Starch

  Amino acids

  Fat

  Cellulose
• The rate of photosynthesis in a plant depends on several factors in the environment. These factors include light intensity and the availability of water.
• Describe and explain the effects of a factor that affect the rate of photosynthesis.

  CO2

  as it increases so does rate and then it levels off because CO2 is the raw material when another factor limits the rate.
• Describe and explain the effects of a factor that affect the rate of photosynthesis.

  Temperature

  as temperature increases, so does the rate and then it decreases as the rise in temp increases rate of chemical reactions
• Equation for photosynthesis

  6CO2 + 6H2O → C6H12O6 + 6O2

  Carbon dioxide+ Water-> Glucose+ Oxygen
• Why was it important to use a thermometer in this investigation?

  To measure temperature

  to check that the temperature isn’t changing

  rate of reaction changes with temperature

  
• Photosynthesis is the process by which green plants make their own food.
• Photosynthesis equation

  
• Glucose contains chemical energy which is available for use in respiration. The glucose can also be stored as starch for future use in respiration and used to form cellulose, a chemical in cell walls.
• The rate of photosynthesis can be limited by factors which are in short supply. Causing growth of the plants to be limited.
• Low light intensity can limit photosynthesis as well as low carbon dioxide concentration and even low temperature.