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

Why does photosynthesis rate level off as light intensity increases?
  1. A different factor becomes limiting
  2. Light is no longer needed
  3. Chlorophyll is destroyed immediately
  4. Respiration stops completely

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

Why does very high temperature reduce photosynthesis rate?
  1. Enzymes involved in photosynthesis can denature
  2. Chloroplasts turn into mitochondria
  3. Carbon dioxide turns into nitrogen
  4. Water cannot enter roots by osmosis

Question 6

Why might farmers add carbon dioxide in a greenhouse?
  1. To increase photosynthesis and yield
  2. To reduce mineral ion uptake
  3. To stop enzyme activity in leaves
  4. To remove need for light

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 using glucose and nitrate ions?
  1. Amino acids and then proteins
  2. Lipids only
  3. Carbon dioxide
  4. Oxygen for release

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

Why is a plant destarched before testing if photosynthesis has occurred?
  1. To remove stored starch so any new starch is from the test conditions
  2. To increase chlorophyll concentration
  3. To stop respiration permanently
  4. To make leaves absorb iodine faster

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

Why is respiration an exothermic reaction?
  1. It releases energy to the surroundings
  2. It absorbs energy from the surroundings
  3. It only occurs above \(100\,\mathrm{^\circ C}\)
  4. It needs chlorophyll to proceed

Question 13

During vigorous exercise, what does anaerobic respiration in muscles produce?
  1. Lactic acid
  2. Ethanol
  3. Urea
  4. Starch

Question 14

Why is anaerobic respiration in muscles less sustainable than aerobic respiration?
  1. It releases less energy per glucose and causes lactic acid buildup
  2. It requires more oxygen than aerobic respiration
  3. It can only happen in light
  4. It produces no heat energy

Question 15

After intense exercise, why is oxygen debt repaid?
  1. To oxidise lactic acid and restore normal body conditions
  2. To convert oxygen directly into glucose
  3. To stop all mitochondrial respiration
  4. To remove carbon dioxide from inhaled air

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 only
  4. Nitrogen

Question 18

A student measures oxygen uptake before and during exercise. Why does oxygen uptake usually increase during exercise?
  1. Muscles need more aerobic respiration to release energy
  2. Photosynthesis rate in muscles increases
  3. Muscles switch off respiration
  4. Lactic acid provides oxygen directly

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 do elite athletes often train at high altitude?
  1. Lower oxygen stimulates adaptations that can improve oxygen delivery at sea level
  2. High altitude removes need for respiration
  3. It directly increases chlorophyll in blood
  4. Carbon dioxide concentration is always higher there

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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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