Use Of Biological Resources

Question 1

Nitrogen in plants

Answer 1

Absorbed in the form of nitrates
Needed to make amino acids which are the building blocks of proteins
Lack of nitrogen causes weak growth and yellowing of the leaves of plants

Question 2

Phosphorus in plants

Answer 2

Absorbed in the form of phosphates
Needed to make DNA and cell membranes
Lack of phosphorus can cause poor root growth and discoloured leaves

Question 3

Potassium

Answer 3

Absorbed in the form of various compounds of potassium
Allows enzyme reactions to take place to produce ATP in respiration as well as being needed for the enzymes involved in photosynthesis
Lack of potassium can cause poor growth of flowers and fruits, as well as brown spots on leaves

Question 4

Practical: Investigating Anaerobic Respiration in Yeast CORMS

Answer 4

C – We are changing the temperature in each repeat
O – The type (species) of yeast we are using must be the same
R – We will repeat the investigation several times at each temperature to make sure our results are reliable
M1 – We will measure the number of bubbles (of carbon dioxide) produced
M2 – in a set time period (e.g. 2 minutes)
S – We will control the concentration, volume and pH of the sugar solution, as well as the mass of yeast added