Use of biological resources

Question 1

Factors affecting crop yield

Answer 1

carbon dioxide limits photosynthesis.
temperature not allow enzymes to work at optimum temp.

Question 2

Fertilliser

Answer 2

contains nutrients that allow plants to grow.
Nitrates, phosphates and potassium

Question 3

Why is nitrates needed in fertiliser?

Answer 3

Nitrates - required to make amino acids for proteins to allow plant to grow.

Question 4

Why is phosphates needed in fertilliser?

Answer 4

required for respiration and root growth

Question 5

Why is potassium needed in fertiliser?

Answer 5

needed for growth of flowers and fruits, allow enzymes reactions to take place.

Question 6

Pest control

Answer 6

using pesticides or biology control to prevent insects eating the plants

Question 7

advantages of pest control

Answer 7

• quick and efficient
• can kill entire populations

Question 8

disadvantages of pest control

Answer 8

• organisms can develop resistance
• non specific so kills others organisms
• can make it toxic to others in the food chain
• have to constantly do

Question 9

Yeast

Answer 9

uses anaerobic respiration in order to bread to rise

Question 10

Calculation for yeast

Answer 10

Glucose (C6H12O6) = Ethanol + Carbon dioxide (CO2)

Question 11

Ligase enzymes

Answer 11

enzymes that are used to join pieces of DNA

Question 12

Transgenic

Answer 12

transfer of genetic material from one species to a different species

Question 13

advantages of cloning

Answer 13

• produce identical offspring
• large number of clones can be produced
• produce organs can be used as organ transplant and will not be rejected

Question 14

disadvantages in cloning

Answer 14

• decreases variation in population
• more susceptible to diseases as no variation