Respiration

Question 1

Breathing

Answer 1

Mechanical process of taking air into lungs and expelling stale air

Question 2

Respiration

Answer 2

Respiration is a chemical reaction that takes place in all cell s to release energy

Question 3

Composition of oxygen carbon dioxide and nitrogen in inhaled and exhaled air

Answer 3

Inhaled air:
Oxygen 21% carbon dioxide 0.04% Nitrogen 79%
Exhaled air:
Oxygen 16% carbon dioxide 4% nitrogen 79%

Question 4

Respiration equation

Answer 4

energy

Glucose + oxygen ———> carbon dioxide + water

Question 5

What will limewater turn when carbon dioxide is present?

Answer 5

From clear colourless to cloudy when carbon dioxide is present

Question 6

Hydrogen carbonate soloution in different concentrations of co2

Answer 6

An indicator to measure levels of co2
Red in equilibrium with atmospheric air
More orange/ yellow with increased co2 levels
Changes red through magenta to deep purple as carbon dioxide is removed

Question 7

investigating effect of temperature in yeast

Answer 7

Variable we will change (independent) water bath temperature
Variable we will measure (dependent) volume of carbon dioxide released
Control variables: volume of yeast solution
Time we leave solution for
Size of measuring cylinder

Question 8

Method

Answer 8

Collect 10 ml yeast solution in boiling tube
Put this in water bath- leave for 3-5 mins to acclimatise
Half fill tub of water and fully fill measuring cylinder, hand over top of cylinder and stand it upside down in tub so still full of water
Place bung end of delivery tube in boiling tube
Place end of delivery tube in water measuring cylinder and record how much co2 is made every 1 min
Repeat

Question 9

CORMSS

Answer 9

Change- independent
Organism- living organisms similar ap
Repeats- at least 3 improves reliability
Measure- dependent
Measure- how will measure dependent.
Same x2- what is control variables?

Question 10

Reliable

Answer 10

Recording similar results gives more confidence that your data is accurate. Repeats = reliability and helps identify anomalies

Question 11

Accurate

Answer 11

The proximity of a measured value to true value

Question 12

Valid

Answer 12

Controlling all other variables other than independent = more valid + data more accurate

Question 13

Anaerobic respiration

Answer 13

No oxygen needed
Glucose —> lactic acid
Cramps because build up of lactic acid

Question 14

Respiration- what is it used for?

Answer 14

Growing, reproduction, digestion, insulation, contraction of muscles for movement.

Question 15

Some Energy from respiration is released as ….

Answer 15

Heat