Bioenergetics questions

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Bioenergetics question collection

Review Bioenergetics questions for Biology, with correct answers shown and coverage across photosynthesis and limiting factors; aerobic and anaerobic respiration; metabolism in organisms.

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Question 1

Which word equation is correct for photosynthesis?
  1. \(\text{Carbon dioxide} + \text{water} \to \text{glucose} + \text{oxygen}\)
  2. \(\text{Glucose} + \text{oxygen} \to \text{carbon dioxide} + \text{water}\)
  3. \(\text{Carbon dioxide} + \text{oxygen} \to \text{glucose} + \text{water}\)
  4. \(\text{Water} + \text{glucose} \to \text{carbon dioxide} + \text{oxygen}\)

Question 2

Which pair are limiting factors of photosynthesis?
  1. Light intensity and carbon dioxide concentration
  2. Blood glucose concentration and pulse rate
  3. Soil pH and blood pressure
  4. Oxygen concentration and heart rate

Question 3

What causes photosynthesis rate to level off as light intensity rises?
  1. Another factor becoming limiting
  2. Less light reaching chloroplasts
  3. Chlorophyll becoming a reactant
  4. Respiration replacing photosynthesis

Question 4

A lamp is moved closer to a pondweed sample. Why does photosynthesis usually speed up first?
  1. Light intensity at the leaf increases
  2. Carbon dioxide concentration in air falls
  3. Leaf chloroplast number immediately doubles
  4. Respiration changes to anaerobic

Question 5

What causes photosynthesis to fall at very high temperature?
  1. Denaturation of photosynthesis enzymes
  2. Slower movement of chlorophyll particles
  3. Carbon dioxide becoming a limiting mineral
  4. Glucose changing back into light energy

Question 6

Why might a grower add carbon dioxide to a greenhouse?
  1. To remove a photosynthesis limit
  2. To replace light as the energy source
  3. To provide nitrate ions for proteins
  4. To lower enzyme activity in leaves

Question 7

Why do plants convert some glucose from photosynthesis into starch?
  1. To store energy
  2. To absorb light in chloroplasts
  3. To transport water in xylem
  4. To neutralise soil acids

Question 8

What do plants make from glucose and nitrate ions?
  1. Amino acids
  2. Fatty acids
  3. Carbon dioxide
  4. Cellulose

Question 9

When does iodine solution turn blue-black in the starch test on a leaf?
  1. When starch is present
  2. When glucose is absent
  3. When protein is present
  4. When lipids are present

Question 10

What does destarching establish before a photosynthesis test?
  1. Detected starch formed under the test conditions
  2. Detected glucose came from the iodine solution
  3. Detected chlorophyll formed during darkness
  4. Detected protein came from carbon dioxide

Question 11

Which word equation is correct for aerobic respiration?
  1. \(\text{Glucose} + \text{oxygen} \to \text{carbon dioxide} + \text{water}\)
  2. \(\text{Carbon dioxide} + \text{water} \to \text{glucose} + \text{oxygen}\)
  3. \(\text{Glucose} \to \text{ethanol} + \text{carbon dioxide}\)
  4. \(\text{Glucose} + \text{oxygen} \to \text{lactic acid}\)

Question 12

Which result shows respiration is exothermic?
  1. Germinating seeds warm their surroundings
  2. Germinating seeds consume oxygen
  3. Seedlings lose stored dry mass
  4. Seedlings produce carbon dioxide

Question 13

What does anaerobic respiration produce in human muscles?
  1. Lactic acid
  2. Ethanol and carbon dioxide
  3. Carbon dioxide and water
  4. Glucose and oxygen

Question 14

Why is muscle anaerobic respiration less sustainable?
  1. Less energy released; lactic acid accumulates
  2. More energy released; oxygen accumulates
  3. Less energy released; ethanol accumulates
  4. More energy released; glucose accumulates

Question 15

Why does breathing remain fast after intense exercise?
  1. To oxidise and remove lactic acid
  2. To convert oxygen directly into glucose
  3. To stop mitochondrial respiration
  4. To produce more lactic acid

Question 16

Which products form during anaerobic respiration in yeast?
  1. Ethanol and carbon dioxide
  2. Lactic acid and oxygen
  3. Water and oxygen
  4. Protein and glucose

Question 17

In bread making, what does yeast produce that causes dough to rise?
  1. Carbon dioxide
  2. Oxygen
  3. Water vapour
  4. Nitrogen

Question 18

Why does oxygen uptake increase during exercise?
  1. Muscles increase aerobic respiration
  2. Muscles increase photosynthesis
  3. Muscles stop releasing energy
  4. Muscles produce oxygen from lactic acid

Question 19

If a pondweed produces \(36\) bubbles in \(3\,\mathrm{min}\), what is the average rate?
  1. \(12\) bubbles per minute
  2. \(9\) bubbles per minute
  3. \(18\) bubbles per minute
  4. \(108\) bubbles per minute

Question 20

Why can altitude training improve endurance?
  1. Low oxygen stimulates more red blood cells
  2. High oxygen enlarges lung airways
  3. Low carbon dioxide stops anaerobic respiration
  4. High pressure increases haemoglobin affinity

Question 21

Where does most aerobic respiration occur in a cell?
  1. Mitochondria
  2. Chloroplasts
  3. Ribosomes
  4. Nucleus

Question 22

What is chlorophyll's function?
  1. Absorb light for photosynthesis
  2. Absorb nitrate ions from soil
  3. Transport water through xylem
  4. Break down glucose in respiration

Question 23

Why do plants store some glucose as starch?
  1. Starch is insoluble and suitable for storage
  2. Starch diffuses out of cells quickly
  3. Starch is a gas
  4. Starch provides light energy

Question 24

Why can low temperature slow photosynthesis?
  1. Enzyme-controlled reactions proceed more slowly
  2. Photosynthesis enzymes denature immediately
  3. Chlorophyll absorbs no wavelengths
  4. Carbon dioxide changes into oxygen

Question 25

What is the role of nitrate ions in plants?
  1. Making proteins for growth
  2. Making cell walls from cellulose
  3. Transporting oxygen
  4. Producing antibodies

Question 26

Why do plants need magnesium ions?
  1. To make chlorophyll
  2. To make red blood cells
  3. To digest lipids
  4. To form antibodies

Question 27

What happens to respiration rate when exercise intensity increases?
  1. It increases to supply more energy
  2. It falls because muscles need less energy
  3. It remains unchanged
  4. It takes place only in the lungs

Question 28

What is oxygen debt?
  1. Extra oxygen needed after exercise to remove lactic acid
  2. Oxygen stored in bones
  3. A lack of carbon dioxide in blood
  4. A type of blood clot

Question 29

Which yeast product is useful in brewing?
  1. Ethanol
  2. Lactic acid
  3. Oxygen
  4. Starch

Question 30

Which is the balanced equation for photosynthesis?
  1. 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
  2. CO₂ + H₂O → C₆H₁₂O₆ + O₂
  3. 6O₂ + C₆H₁₂O₆ → 6CO₂ + 6H₂O
  4. 6CO₂ + 6O₂ → C₆H₁₂O₆ + 6H₂O

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Review Bioenergetics questions for Biology, with correct answers shown and coverage across photosynthesis and limiting factors; aerobic and anaerobic respiration; metabolism in organisms.

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