Class 9 – Chapter 8: Bioenergetics | MCQs (1–20)
Section 1: Basic Concepts of Bioenergetics
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Bioenergetics is the study of:
a) Life cycles
b) Body organs
c) Energy flow in living organisms
d) Cell division
✅ Answer: c) Energy flow in living organisms -
The ultimate source of energy for all living things is
a) Water
b) Sun
c) Oxygen
d) Soil
✅ Answer: b) Sun -
Which process converts light energy into chemical energy?
a) Respiration
b) Photosynthesis
c) Digestion
d) Excretion
✅ Answer: b) Photosynthesis -
The main product of photosynthesis is:
a) Oxygen
b) Carbon dioxide
c) Glucose
d) Water
✅ Answer: c) Glucose -
The process of photosynthesis takes place in:
a) Mitochondria
b) Cytoplasm
c) Chloroplast
d) Nucleus
✅ Answer: c) Chloroplast -
Photosynthesis occurs mainly in:
a) Stems
b) Roots
c) Leaves
d) Flowers
✅ Answer: c) Leaves -
The green pigment in plants is
a) Chlorophyll
b) Xylem
c) Hemoglobin
d) Phloem
✅ Answer: a) Chlorophyll -
Chlorophyll absorbs light most efficiently in the:
a) Green and yellow regions
b) Blue and red regions
c) Infrared region
d) Ultraviolet region
✅ Answer: b) Blue and red regions -
Which gas is used during photosynthesis?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
✅ Answer: c) Carbon dioxide -
Which of the following is a by-product of photosynthesis?
a) Nitrogen
b) Oxygen
c) Water
d) Carbon dioxide
✅ Answer: b) Oxygen -
The overall equation of photosynthesis is
a) O₂ + Glucose → CO₂ + H₂O + Energy
b) CO₂ + H₂O → Glucose + O₂
c) Glucose → CO₂ + H₂O
d) O₂ → CO₂ + Glucose
✅ Answer: b) CO₂ + H₂O → Glucose + O₂ -
Which organelle is known as the powerhouse of the cell?
a) Ribosome
b) Mitochondrion
c) Chloroplast
d) Nucleus
✅ Answer: b) Mitochondrion -
Cellular respiration mainly occurs in:
a) Chloroplast
b) Vacuole
c) Mitochondria
d) Nucleus
✅ Answer: c) Mitochondria -
Which molecule stores energy in cells?
a) DNA
b) RNA
c) ATP
d) Protein
✅ Answer: c) ATP -
ATP stands for:
a) Adenosine triphosphate
b) Adenine tetraphosphate
c) Amino triphosphate
d) Adenosine tetraphosphate
✅ Answer: a) Adenosine triphosphate -
The process of breaking down glucose to release energy is
a) Photosynthesis
b) Transpiration
c) Respiration
d) Digestion
✅ Answer: c) Respiration -
Respiration that uses oxygen is called:
a) Anaerobic
b) Aerobic
c) Glycolysis
d) Hydrolysis
✅ Answer: b) Aerobic -
Respiration without oxygen is known as
a) Glycolysis
b) Aerobic respiration
c) Anaerobic respiration
d) Photolysis
✅ Answer: c) Anaerobic respiration -
Which of the following is not a stage of cellular respiration?
a) Glycolysis
b) Krebs cycle
c) Electron transport chain
d) Photosystem II
✅ Answer: d) Photosystem II -
The first step of respiration is
a) Glycolysis
b) Photosynthesis
c) Krebs cycle
d) Fermentation
✅ Answer: a) Glycolysis
Section 2: Photosynthesis Details & Types of Respiration
-
The raw materials for photosynthesis are
a) Glucose and oxygen
b) Water and carbon dioxide
c) Oxygen and nitrogen
d) ATP and water
✅ Answer: b) Water and carbon dioxide -
Which of these is not a part of a chloroplast?
a) Grana
b) Stroma
c) Cristae
d) Thylakoid
✅ Answer: c) Cristae -
The light-dependent phase of photosynthesis takes place in the:
a) Stroma
b) Cytoplasm
c) Thylakoid membrane
d) Cell wall
✅ Answer: c) Thylakoid membrane -
The light-independent phase is also known as the:
a) Light reaction
b) Calvin cycle
c) Krebs cycle
d) Photosystem
✅ Answer: b) Calvin cycle -
The Calvin cycle occurs in the:
a) Nucleus
b) Thylakoid
c) Stroma
d) Mitochondria
✅ Answer: c) Stroma -
What is the first stable product of the Calvin cycle?
a) ATP
b) Oxygen
c) Glucose
d) 3-PGA
✅ Answer: d) 3-PGA -
Which gas is released during photosynthesis?
a) Nitrogen
b) Oxygen
c) Carbon dioxide
d) Methane
✅ Answer: b) Oxygen -
The energy source for photosynthesis is
a) Heat
b) Wind
c) Sunlight
d) ATP
✅ Answer: c) Sunlight -
Anaerobic respiration occurs in:
a) All plants
b) Yeast and some bacteria
c) Humans only
d) Animals only
✅ Answer: b) Yeast and some bacteria -
In anaerobic respiration, the end product in yeast is
a) Lactic acid
b) Oxygen
c) Ethanol and CO₂
d) Glucose
✅ Answer: c) Ethanol and CO₂ -
Anaerobic respiration in human muscles produces:
a) Water
b) Lactic acid
c) Ethanol
d) Glucose
✅ Answer: b) Lactic acid -
During heavy exercise, which type of respiration may occur in muscles?
a) Aerobic
b) Anaerobic
c) Photosynthesis
d) Digestion
✅ Answer: b) Anaerobic -
In aerobic respiration, glucose is completely broken into:
a) Alcohol and CO₂
b) Water and ATP only
c) Carbon dioxide and water
d) Glucose and ATP
✅ Answer: c) Carbon dioxide and water -
Which of the following processes releases more energy?
a) Aerobic respiration
b) Anaerobic respiration
c) Glycolysis
d) Fermentation
✅ Answer: a) Aerobic respiration -
Which of these is common to both aerobic and anaerobic respiration?
a) Electron transport chain
b) Krebs cycle
c) Glycolysis
d) Photosynthesis
✅ Answer: c) Glycolysis -
Glycolysis occurs in the:
a) Mitochondria
b) Chloroplast
c) Cytoplasm
d) Ribosome
✅ Answer: c) Cytoplasm -
The number of ATP molecules produced in glycolysis is
a) 4 nets
b) 2 net
c) 6 net
d) 8 net
✅ Answer: b) 2 net -
What is the final electron acceptor in aerobic respiration?
a) Glucose
b) NADH
c) Oxygen
d) CO₂
✅ Answer: c) Oxygen -
The energy stored in ATP is in the form of:
a) Covalent bonds
b) Phosphate bonds
c) Nitrogen bonds
d) Hydrogen bonds
✅ Answer: b) Phosphate bonds -
In aerobic respiration, most ATP is produced during:
a) Glycolysis
b) Krebs cycle
c) Electron transport chain
d) Calvin cycle
✅ Answer: c) Electron transport chain
Section 3: ATP, Mitochondria & Applications
-
ATP is often called the
a) Genetic material
b) Energy currency of the cell
c) Storage molecule
d) Structural protein
✅ Answer: b) Energy currency of the cell -
Which organelle produces most of the ATP in a cell?
a) Nucleus
b) Ribosome
c) Mitochondria
d) Chloroplast
✅ Answer: c) Mitochondria -
The inner membrane of mitochondria is folded into:
a) Grana
b) Thylakoids
c) Cristae
d) Stroma
✅ Answer: c) Cristae -
Which process occurs in the mitochondrial matrix?
a) Glycolysis
b) Calvin cycle
c) Krebs cycle
d) Light reaction
✅ Answer: c) Krebs cycle -
During aerobic respiration, glucose breaks down into:
a) Pyruvate only
b) Water and oxygen
c) Carbon dioxide and water
d) Oxygen and glucose
✅ Answer: c) Carbon dioxide and water -
Which molecule carries electrons during respiration?
a) ATP
b) NADH and FADH₂
c) CO₂
d) Glucose
✅ Answer: b) NADH and FADH₂ -
The maximum number of ATP molecules produced from one glucose molecule is about:
a) 10
b) 36-38
c) 2
d) 100
✅ Answer: b) 36-38 -
The site of photosynthesis is the chloroplast, while the site of respiration is
a) Nucleus
b) Vacuole
c) Mitochondria
d) Ribosome
✅ Answer: c) Mitochondria -
Which of the following statements is true?
a) Photosynthesis stores energy; respiration releases energy
b) Both release energy
c) Both store energy
d) Neither stores nor releases energy
✅ Answer: a) Photosynthesis stores energy; respiration releases energy -
During respiration, energy is released by
a) Breaking glucose molecules
b) Breaking ATP molecules
c) Photosynthesis
d) Water splitting
✅ Answer: a) Breaking glucose molecules -
The energy released during respiration is stored in:
a) ADP
b) ATP
c) NADH
d) CO₂
✅ Answer: b) ATP -
Which gas is essential for aerobic respiration?
a) Carbon dioxide
b) Oxygen
c) Nitrogen
d) Hydrogen
✅ Answer: b) Oxygen -
Fermentation in yeast produces:
a) Lactic acid
b) Ethanol and carbon dioxide
c) Oxygen
d) Glucose
✅ Answer: b) Ethanol and carbon dioxide -
The breakdown of glucose in the absence of oxygen is called:
a) Aerobic respiration
b) Anaerobic respiration
c) Photosynthesis
d) Oxidation
✅ Answer: b) Anaerobic respiration -
Which one is NOT a product of aerobic respiration?
a) Carbon dioxide
b) Water
c) Oxygen
d) ATP
✅ Answer: c) Oxygen -
Which process produces more ATP, aerobic or anaerobic respiration?
a) Aerobic respiration
b) Anaerobic respiration
c) Both produce same
d) Neither produces ATP
✅ Answer: a) Aerobic respiration -
The energy released during respiration is used for:
a) Growth and repair
b) Movement
c) Maintaining body temperature
d) All of the above
✅ Answer: d) All of the above -
In photosynthesis, water is split to release:
a) Carbon dioxide
b) Oxygen
c) Glucose
d) Nitrogen
✅ Answer: b) Oxygen -
The enzyme that helps in the breakdown of glucose during glycolysis is
a) Amylase
b) Hexokinase
c) Protease
d) Lipase
✅ Answer: b) Hexokinase -
Which coenzyme carries electrons to the electron transport chain?
a) ATP
b) NADH
c) ADP
d) FAD
✅ Answer: b) NADH
Section 4: Energy Flow, Respiration Types & Environmental Importance
-
The process by which green plants prepare their own food is called:
a) Respiration
b) Photosynthesis
c) Digestion
d) Fermentation
✅ Answer: b) Photosynthesis -
Photosynthesis occurs in the presence of:
a) Darkness
b) Light
c) Heat only
d) Water only
✅ Answer: b) Light -
The main pigment involved in photosynthesis is:
a) Carotene
b) Xanthophyll
c) Chlorophyll
d) Hemoglobin
✅ Answer: c) Chlorophyll -
Which part of the plant primarily carries out photosynthesis?
a) Roots
b) Stem
c) Leaves
d) Flowers
✅ Answer: c) Leaves -
The process of breaking down glucose without oxygen is called:
a) Aerobic respiration
b) Anaerobic respiration
c) Photosynthesis
d) Fermentation
✅ Answer: b) Anaerobic respiration -
Which gas is absorbed by plants during photosynthesis?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
✅ Answer: b) Carbon dioxide -
Which gas is released by plants during photosynthesis?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Methane
✅ Answer: a) Oxygen -
Photosynthesis converts:
a) Light energy into chemical energy
b) Chemical energy into light energy
c) Heat energy into mechanical energy
d) Mechanical energy into chemical energy
✅ Answer: a) Light energy into chemical energy -
Which of the following is NOT a product of photosynthesis?
a) Oxygen
b) Glucose
c) Carbon dioxide
d) Water
✅ Answer: c) Carbon dioxide -
The energy released from glucose during respiration is stored in:
a) ADP
b) ATP
c) DNA
d) RNA
✅ Answer: b) ATP -
During heavy exercise, muscles sometimes produce energy by:
a) Aerobic respiration only
b) Anaerobic respiration only
c) Both aerobic and anaerobic respiration
d) Photosynthesis
✅ Answer: c) Both aerobic and anaerobic respiration -
Anaerobic respiration in muscles leads to:
a) Production of ethanol
b) Production of lactic acid
c) Production of oxygen
d) Production of glucose
✅ Answer: b) Production of lactic acid -
Which organelle in plant cells contains chlorophyll?
a) Mitochondria
b) Ribosomes
c) Chloroplast
d) Vacuole
✅ Answer: c) Chloroplast -
ATP releases energy when it:
a) Gains a phosphate group
b) Loses a phosphate group
c) Combines with oxygen
d) Is broken down into glucose
✅ Answer: b) Loses a phosphate group -
The waste product of respiration is:
a) Oxygen
b) Carbon dioxide
c) Glucose
d) Water
✅ Answer: b) Carbon dioxide -
Photosynthesis primarily takes place during:
a) Night
b) Day
c) Early morning only
d) Evening only
✅ Answer: b) Day -
Which of the following is a by-product of fermentation?
a) Carbon dioxide
b) Water
c) Oxygen
d) Nitrogen
✅ Answer: a) Carbon dioxide -
The energy needed for all cellular activities comes from:
a) Glucose
b) ATP
c) Oxygen
d) Chlorophyll
✅ Answer: b) ATP -
Which of the following is NOT involved in energy conversion in cells?
a) Chloroplast
b) Mitochondria
c) Ribosome
d) ATP
✅ Answer: c) Ribosome -
The light reactions of photosynthesis produce:
a) ATP and NADPH
b) Glucose
c) Carbon dioxide
d) Oxygen and glucose
✅ Answer: a) ATP and NADPH
Section 5: Advanced Concepts & Environmental Importance
-
The dark reaction of photosynthesis does not require:
a) Light
b) Carbon dioxide
c) ATP
d) Enzymes
✅ Answer: a) Light -
Which cycle is involved in the dark reaction?
a) Krebs cycle
b) Calvin cycle
c) Electron transport chain
d) Glycolysis
✅ Answer: b) Calvin cycle -
Which of the following is a source of carbon for photosynthesis?
a) Oxygen
b) Carbon dioxide
c) Glucose
d) Water
✅ Answer: b) Carbon dioxide -
The oxygen released during photosynthesis comes from:
a) Carbon dioxide
b) Glucose
c) Water
d) Chlorophyll
✅ Answer: c) Water -
The ATP produced during respiration is synthesized by:
a) ATP synthase enzyme
b) DNA polymerase
c) Protease
d) Lipase
✅ Answer: a) ATP synthase enzyme -
Which of these processes occur in mitochondria?
a) Glycolysis and Krebs cycle
b) Krebs cycle and Electron transport chain
c) Calvin cycle and Photosystem
d) Light reaction and Calvin cycle
✅ Answer: b) Krebs cycle and Electron transport chain -
The energy currency of the cell, ATP, is made of:
a) Adenine, ribose, and three phosphate groups
b) Glucose and oxygen
c) Carbon dioxide and water
d) Protein and lipids
✅ Answer: a) Adenine, ribose, and three phosphate groups -
Anaerobic respiration produces less energy than aerobic respiration because:
a) It uses oxygen
b) It incompletely breaks down glucose
c) It produces water
d) It occurs in chloroplast
✅ Answer: b) It incompletely breaks down glucose -
Photosynthesis helps maintain the balance of:
a) Nitrogen
b) Carbon dioxide and oxygen
c) Hydrogen
d) Water only
✅ Answer: b) Carbon dioxide and oxygen -
Which of the following organisms can carry out photosynthesis?
a) Plants only
b) Plants and some bacteria
c) Animals
d) Fungi
✅ Answer: b) Plants and some bacteria -
Energy lost as heat during respiration is:
a) Useful energy
b) Waste energy
c) Stored as ATP
d) Used in photosynthesis
✅ Answer: b) Waste energy -
In which organelle does the electron transport chain occur?
a) Chloroplast
b) Mitochondria
c) Nucleus
d) Ribosome
✅ Answer: b) Mitochondria -
Photosynthesis requires which pigment to absorb sunlight?
a) Hemoglobin
b) Chlorophyll
c) Melanin
d) Carotene
✅ Answer: b) Chlorophyll -
The waste oxygen produced in photosynthesis is used by:
a) Plants for photosynthesis
b) Animals and plants for respiration
c) Soil bacteria
d) Fungi only
✅ Answer: b) Animals and plants for respiration -
The glucose produced during photosynthesis is used:
a) Immediately for energy
b) Stored as starch
c) To build cell walls
d) Both a and b
✅ Answer: d) Both a and b -
Which of the following is NOT part of aerobic respiration?
a) Glycolysis
b) Krebs cycle
c) Calvin cycle
d) Electron transport chain
✅ Answer: c) Calvin cycle -
The energy released in respiration is measured in units called:
a) Joules or calories
b) Watts
c) Volts
d) Amperes
✅ Answer: a) Joules or calories -
The process by which glucose is broken down in the presence of oxygen is called:
a) Anaerobic respiration
b) Aerobic respiration
c) Photosynthesis
d) Fermentation
✅ Answer: b) Aerobic respiration -
Which part of the plant transports glucose?
a) Xylem
b) Phloem
c) Stomata
d) Root hairs
✅ Answer: b) Phloem -
The primary function of respiration is to:
a) Produce food
b) Release energy from food
c) Absorb sunlight
d) Store energy
✅ Answer: b) Release energy from food
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