Photosynthesis
Name the two raw materials needed for photosynthesis.
Carbon dioxide and water
What chemical is used to test a leaf for starch?
Iodine
Name the three main elements found in fertilisers.
Name two sources of excess nutrients in rivers or lochs.
Fertilisers and manure
Detergents
sewage
Name the leaf layer where most photosynthesis occurs.
Palisade mesophyll
Name the two products of photosynthesis.
Glucose and oxygen
Describe the colour change that shows starch is present.
Iodine turns blue black
What is the role of nitrogen in plant growth?
Leaf growth
Why is adding fertiliser directly to rivers harmful?
Causes and algal bloom which blocks sunlight.
Preventing aquatic plants from photosynthesising and therefore they reduce oxygen levels.
Why do palisade cells contain many chloroplasts?
To absorb more light.
Where in a plant cell does photosynthesis take place?
In the chloroplast
Why is a leaf boiled in water during a starch test?
To kill the cells
Describe one symptom of nitrogen deficiency.
Yellowing of the leaves
What is eutrophication?
When water bodies get Excess nutrients that cause algal growth and oxygen loss.
What is the function of the xylem?
Transports water.
Name the green pigment found in plant leaves.
Chlorophyll
Why heat in alcohol?
To remove chlorophyll.
What is phosphorus needed for in plants?
Root growth
What causes the fish to die in a water body rich in nutrients?
A lack of oxygen
What is the function of stomata?
Gas exchange.
Why is light needed?
It provides energy for the reaction.
Which areas turn blue-black?
Green areas because they contain chlorophyll.
What happens to a plant that lacks potassium?
Poor flowers / weak stems
Why do fertilisers harm rivers and other water bodies?
They reduce oxygen levels in the water.
Why are stomata mostly found on the lower epidermis?
Reduces water loss.