Question 1
What is respiration in cells?
- A chemical process that releases energy from glucose
- Movement of air into and out of the lungs
- A process that makes glucose from carbon dioxide and water
- Transport of water through xylem
Question 2
In most cells, where does aerobic respiration mainly happen?
- Mitochondria
- Nucleus
- Ribosomes
- Cell wall
Question 3
Which word equation represents aerobic respiration?
- \(\text{Glucose} + \text{oxygen} \to \text{carbon dioxide} + \text{water}\)
- \(\text{Carbon dioxide} + \text{water} \to \text{glucose} + \text{oxygen}\)
- \(\text{Glucose} \to \text{ethanol} + \text{carbon dioxide}\)
- \(\text{Glucose} + \text{oxygen} \to \text{lactic acid}\)
Question 4
Which substance must be available for aerobic respiration?
- Oxygen
- Nitrogen
- Chlorophyll
- Starch
Question 5
Which gas is produced in aerobic respiration?
- Carbon dioxide
- Oxygen
- Hydrogen
- Helium
Question 6
When does anaerobic respiration happen in human muscles?
- When oxygen supply cannot meet demand during vigorous exercise
- Only when glucose is absent from the blood
- Only while a person is asleep
- When body temperature decreases slightly
Question 7
What is the main product of anaerobic respiration in human muscles?
- Lactic acid
- Ethanol
- Oxygen
- Urea
Question 8
What is anaerobic respiration in yeast called?
- Fermentation
- Neutralisation
- Transpiration
- Diffusion
Question 9
What are the main products of anaerobic respiration in yeast?
- Ethanol and carbon dioxide
- Lactic acid and oxygen
- Water and oxygen
- Protein and glucose
Question 10
Compared with aerobic respiration, how much energy does anaerobic respiration release?
- Less energy per glucose molecule
- More energy per glucose molecule
- Exactly the same amount of energy
- No energy at all
Question 11
Why can anaerobic respiration in muscles only continue for a short time?
- It releases less energy and causes lactic acid to build up
- It uses too much oxygen in muscle cells
- It stops all glucose supply to muscles
- It prevents blood from carrying any carbon dioxide
Question 12
What is oxygen debt after exercise?
- The extra oxygen needed to remove lactic acid and restore the body
- The oxygen permanently lost from the lungs
- The oxygen not used during rest
- The oxygen converted into glucose in muscles
Question 13
After hard exercise, why does breathing rate often stay high?
- Repay oxygen debt
- Increase lactic acid concentration
- Reduce blood flow to muscles
- Stop aerobic respiration
Question 14
Which process happens in both plant and animal cells all the time?
- Respiration
- Photosynthesis
- Pollination
- Digestion
Question 15
Why can a plant kept in darkness stay alive overnight?
- It can respire using stored glucose
- It can photosynthesise faster without light
- It can make oxygen directly from mineral ions
- It can stop all energy transfer until daylight
Question 16
In bread-making with yeast, which gas makes dough rise?
- Carbon dioxide
- Oxygen
- Nitrogen
- Hydrogen
Question 17
In brewing, ethanol is produced from what by yeast fermentation?
- Glucose
- Oxygen
- Protein
- Mineral ions
Question 18
Which statement correctly compares aerobic and anaerobic respiration?
- Aerobic uses oxygen; anaerobic does not
- Aerobic occurs only in plants; anaerobic only in animals
- Anaerobic needs oxygen but aerobic does not
- Both always produce ethanol in humans
Question 19
A germinating seed in a closed flask turns limewater milky. What does this show?
- The seed releases carbon dioxide during respiration
- The seed is only photosynthesising
- The seed is absorbing all carbon dioxide
- The seed has stopped all metabolism
Question 20
If a student starts sprinting, which type of respiration in muscles increases when oxygen cannot be delivered fast enough?
- Anaerobic respiration
- Photosynthesis
- Transpiration
- Aerobic respiration only