topic 4 - Bioenergetics

Question 1

symbol equation for photosynthesis

Answer 1

6Co2 + 6H20 into (via light) C6 H12 O6 + 6O2

Question 2

Is photosynthesis exothermic or endothermic

Answer 2

Endothermic

Question 3

Give the uses for the glucose made from photosynthesis

Answer 3

used for respiration
converted into insoluble starch for storage
used to produce fat or oil for storage
used to produce cellulose, which strengthens the cell wall
used to produce amino acids for protein synthesis.

Question 4

Define respiration

Answer 4

An exothermic reaction which transfers energy from glucose and is continuously occuring in living cells

Question 5

3 reasons why respiration takes place

Answer 5

.To build up larger molecules from smaller ones eg proteins from amino acids
.For muscular contraction
.To maintain our body temp

Question 6

What is metabolism

Answer 6

All chemical reactions in a living organism in order to maintain life

Question 7

Give the equations for both anerobic and aerobic respiration

Answer 7

aerobic - glucose + oxygen into carbon dioxide + water
Anaerobic - Glucose into lactic acid (incomplete glucose breakdown- less energy produced)

Question 8

Anaerobic respiration in plants

Answer 8

glucose into ethanol and carbon dioxide , in yeast this is called fermentation

Question 9

Ways to optimise photosynthesis for farmers

Answer 9

Greenhouses - can trap the suns heat and stops pests also they can use pestacides
Artificial light - allows photosynthesis to still happen
Co2 pump or use a paraffin heater that heats up and produces Co2 aswell