Practice: Respiration & Energy
Cellular Respiration and Types of Respiration
Q1: Cellular respiration in living cells mainly helps to:
A) Store food in the body
B) Release energy from food in the form of ATP
C) Produce only heat from food
D) Convert proteins into vitamins
Q2: Which cell organelle is called the “power house of the cell” because it is the main site of respiration?
A) Nucleus
B) Mitochondrion
C) Ribosome
D) Golgi body
Q3: Which of the following is the correct overall word equation for aerobic respiration?
A) Glucose + Oxygen → Carbon dioxide + Water + Energy
B) Glucose + Water → Oxygen + Carbon dioxide + Energy
C) Oxygen + Carbon dioxide → Glucose + Water + Energy
D) Glucose + Oxygen → Carbon dioxide + Water only (no energy)
Q4: In which of the following is oxygen essentially required for breakdown of food?
A) Aerobic respiration
B) Anaerobic respiration in yeast
C) Anaerobic respiration in muscle cells
D) All types of respiration equally
Q5: In yeast, anaerobic respiration of glucose mainly produces:
A) Lactic acid and water
B) Alcohol, carbon dioxide and small amount of energy
C) Only carbon dioxide and energy
D) Only water and heat without any gas release at all etc.
Q6: During very fast running, some of the energy in our muscles comes from anaerobic respiration, which forms:
A) Alcohol
B) Lactic acid
C) Carbon monoxide
D) Ammonia only in cells etc.
Q7: Which of the following is not a correct difference between aerobic and anaerobic respiration?
A) Aerobic uses oxygen, anaerobic does not
B) Aerobic yields more energy than anaerobic
C) Aerobic occurs only in plants, anaerobic only in animals
D) Aerobic end products are CO₂ and H₂O, anaerobic products may be alcohol or lactic acid
Q8: Seeds kept for germination in a flask show rise in temperature because:
A) They perform only photosynthesis
B) They absorb heat from sunlight
C) They respire actively and release energy as heat
D) They stop all life activities completely etc. during germination period only etc.
Q9: Which human tissue is likely to contain the maximum number of mitochondria per cell?
A) Fat tissue
B) Bone tissue
C) Active muscle tissue
D) Mature red blood cells always etc.
Q10: Which test can directly show that exhaled air of a respiring organism contains carbon dioxide?
A) Passing air through cold water
B) Passing air through lime water and observing milky appearance
C) Passing air over blue litmus paper
D) Passing air through oil and observing mixing etc. in surface layer only etc.
Q11: Cellular respiration is called an oxidation process because:
A) Glucose gains oxygen or loses hydrogen
B) Only oxygen is released
C) Only carbon dioxide is released
D) It never uses oxygen anywhere etc.
Q12: Anaerobic respiration is most useful for:
A) Baking bread using yeast
B) Producing oxygen in leaves
C) Storing extra glucose in muscles
D) Cooling the body during fever always for all animals etc.
Q13: Which statement correctly compares ATP with stored money?
A) ATP is like waste paper in a cell
B) ATP is like currency used whenever cell needs energy
C) ATP is like fixed building structure
D) ATP is like sand stored outside house only etc.
Q14: Which end product is common to both aerobic and anaerobic respiration?
A) Carbon dioxide
B) Water
C) ATP
D) Both ATP and some amount of heat energy
Q15: Which situation shows anaerobic respiration in human body?
A) Sleeping calmly
B) Reading a book
C) Sprinting at maximum speed for a short time
D) Sitting and watching television only etc.
Respiration in Plants and Respiration in Animals
Q16: In green leaves, exchange of gases (O₂ and CO₂) mainly takes place through:
A) Lenticels
B) Stomata
C) Root hairs
D) Xylem vessels only in midrib etc.
Q17: In woody stems of trees, gaseous exchange occurs mostly through:
A) Stomata
B) Lenticels
C) Root hairs
D) Pit cavities inside xylem only etc.
Q18: Roots of plants get oxygen mostly from:
A) Air dissolved in soil water
B) Air inside xylem only
C) Air present in fruits
D) Oxygen released in photosynthesis in leaves only etc.
Q19: Which statement about respiration in plants is correct?
A) Plants respire only at night
B) Plants respire only in leaves
C) Plants respire all the time in all living cells
D) Plants never respire, they only photosynthesise always etc.
Q20: Breathing in humans is related to:
A) Only intake of food
B) Only removal of faeces
C) Exchange of gases between body and environment
D) Formation of blood cells only in bone marrow etc.
Q21: In humans, actual exchange of gases between air and blood occurs in:
A) Trachea
B) Bronchi
C) Alveoli of lungs
D) Diaphragm muscle only etc.
Q22: During inhalation in human beings:
A) Diaphragm moves downward and ribs move up and out
B) Diaphragm moves upward and ribs move down
C) Both diaphragm and ribs remain fixed
D) Lungs contract to push air out only etc.
Q23: In fishes, exchange of gases takes place through:
A) Skin
B) Gills
C) Lungs
D) Air sacs in bones only etc.
Q24: In insects like grasshopper, air enters the body through:
A) Lungs
B) Spiracles connected to tracheal tubes
C) Gills
D) Only mouth cavity always etc.
Q25: The term “breathing rate” refers to:
A) Number of heart beats per minute
B) Number of inhalations and exhalations per minute
C) Amount of oxygen in blood
D) Volume of blood pumped per minute only etc.
Q26: Which statement best differentiates breathing from respiration?
A) Both are identical always
B) Breathing is physical movement of air; respiration is chemical breakdown of food for energy
C) Breathing is chemical, respiration is physical
D) Breathing occurs in mitochondria, respiration in lungs only etc.
Q27: Frogs can breathe through skin when in water because their skin is:
A) Thick and scaly
B) Dry and rough
C) Moist and richly supplied with blood vessels
D) Covered with fur only etc. in adult stage etc.
Q28: Which feature is common to both respiration in plants and animals?
A) Presence of lungs
B) Presence of stomata
C) Use of oxygen and release of carbon dioxide during cellular respiration
D) Use of gills for gas exchange in all stages etc.
Q29: In waterlogged soils, many plants die mainly because:
A) Roots get excess oxygen
B) Roots cannot get enough oxygen for respiration
C) Roots get extra minerals
D) Roots absorb too much light energy only etc.
Q30: When we run fast, breathing becomes deeper and faster because:
A) Body wants more nitrogen
B) Body needs more oxygen and must remove more carbon dioxide
C) Heart stops pumping blood
D) Lungs become weak and collapse only etc.
Respiration versus Combustion
Q31: Which of the following processes is enzyme-controlled and occurs inside cells?
A) Burning of coal in a stove
B) Burning of LPG in a gas burner
C) Cellular respiration
D) Burning of candle wax only etc. in holders etc.
Q32: Which is common to both respiration and combustion?
A) Both always produce light
B) Both require oxygen and release carbon dioxide
C) Both occur only outside the body
D) Both never release any heat energy at all etc.
Q33: Energy released during combustion appears mainly as:
A) ATP inside cells
B) Heat and light
C) Only chemical potential energy
D) Only sound vibrations always etc.
Q34: Which of these is a slow oxidation process?
A) Burning of dry leaves
B) Explosion of crackers
C) Rusting of iron and cellular respiration
D) Burning of kerosene with big flame only etc.
Q35: Which statement about combustion is correct?
A) It needs no oxygen
B) It is always enzyme-controlled
C) It usually gives high temperature and often a flame
D) It produces ATP for cell work always etc.
Q36: The main advantage of respiration over direct combustion of glucose inside cells is that:
A) Combustion releases more energy
B) Respiration releases energy in small controlled steps and stores it in ATP
C) Respiration produces no heat
D) Combustion never produces any harmful substances at all etc.
Q37: In laboratory demonstration of heat produced during respiration, germinating seeds are used instead of dry seeds because:
A) Germinating seeds do not respire
B) Dry seeds respire more
C) Germinating seeds respire actively and release more heat
D) Germinating seeds absorb heat only from surroundings etc.
Q38: Which of the following is not a product of respiration but is a product of burning LPG in a stove?
A) Carbon dioxide
B) Water
C) ATP
D) Heat energy
Q39: In which situation would combustion and respiration be most directly comparable?
A) Burning glucose in a test tube and respiration of glucose inside a cell
B) Rusting of iron and breathing of humans
C) Burning of candle and absorption of CO₂ by plants
D) Melting of ice and breakdown of proteins only etc.
Q40: Which statement about heat produced in respiration is correct?
A) No heat is produced at all
B) All energy becomes heat
C) Only a part of energy appears as heat, rest stored in ATP
D) Heat is produced but never warms the body at all etc.
Q41: Which of these is an example of unwanted combustion product affecting environment?
A) CO₂ from human lungs
B) CO₂ and smoke from burning fossil fuels
C) Water vapour released from plants
D) Oxygen released during photosynthesis only etc.
Q42: Which one of the following is an example of combustion without flame?
A) Burning LPG
B) Burning paper
C) Slow oxidation of iron to form rust
D) Burning kerosene in a lantern only etc.
Q43: When wood is burnt, the energy released was originally stored in wood during:
A) Respiration in animals
B) Photosynthesis in the tree
C) Combustion of coal
D) Rusting of iron rods in soil etc.
Q44: Why is direct burning of glucose inside living cells dangerous?
A) It would release energy too slowly
B) It would release all energy instantly as heat and destroy cells
C) It would form only ATP
D) It would form only lactic acid always etc.
Q45: Which of the following correctly names respiration as a type of process?
A) Uncontrolled combustion
B) Controlled biological oxidation
C) Neutralisation reaction
D) Simple physical change only etc.
Photosynthesis versus Respiration
Q46: Which process is responsible for manufacture of food in green plants?
A) Respiration
B) Photosynthesis
C) Combustion
D) Fermentation only in roots etc.
Q47: In photosynthesis, the energy of sunlight is stored in:
A) ATP only
B) Heat
C) Chemical bonds of glucose
D) Water molecules only in soil etc.
Q48: Which set correctly represents raw materials for photosynthesis and respiration respectively?
A) CO₂ + H₂O for both
B) Glucose + O₂ for both
C) For photosynthesis: CO₂ + H₂O; for respiration: glucose + O₂
D) For photosynthesis: glucose + O₂; for respiration: CO₂ + H₂O only etc.
Q49: Which of the following is a correct pair of major products of photosynthesis?
A) CO₂ and water
B) Glucose and oxygen
C) Glucose and lactic acid
D) Alcohol and CO₂ only etc.
Q50: Which statement correctly compares time of occurrence of photosynthesis and respiration in plants?
A) Both occur only at night
B) Both occur only during day
C) Photosynthesis only in light; respiration all the time
D) Photosynthesis all the time; respiration only in light etc.
Q51: Which process uses CO₂ and releases O₂?
A) Aerobic respiration in cells
B) Anaerobic respiration in yeast
C) Photosynthesis in leaves
D) Combustion of coal only in furnaces etc.
Q52: Which process uses O₂ and releases CO₂ in plant cells?
A) Photosynthesis
B) Respiration
C) Transpiration
D) Seed formation only etc.
Q53: In which cell organelles do photosynthesis and respiration mainly occur respectively?
A) Nucleus and ribosome
B) Chloroplast and mitochondrion
C) Mitochondrion and chloroplast
D) Golgi body and vacuole only in cytoplasm etc.
Q54: Which of the following correctly shows how these two processes are related in nature?
A) Products of respiration are products of photosynthesis
B) Products of photosynthesis become raw materials for respiration
C) Both use same raw materials
D) They are independent with no relation at all etc.
Q55: Which statement about energy is correct?
A) Photosynthesis releases energy; respiration stores energy
B) Photosynthesis stores energy; respiration releases energy
C) Both release energy only
D) Both only store energy without using it at all etc.
Q56: A potted plant is kept in dark for 24 hours and then tested for starch in leaves. The expected result is:
A) Leaf shows strong starch test
B) Leaf shows no starch
C) Only half leaf shows starch
D) Starch test cannot be performed at all etc.
Q57: Which of the following best describes photosynthesis and respiration in a plant leaf during daytime?
A) Only photosynthesis occurs
B) Only respiration occurs
C) Both photosynthesis and respiration occur
D) Neither occurs in daytime etc.
Q58: Which statement about gas exchange near a leaf in bright light is correct?
A) Net intake of O₂ and release of CO₂
B) Net intake of CO₂ and release of O₂
C) Equal intake and release of CO₂
D) No gas exchange at all etc. in leaf surfaces etc.
Q59: At night, what happens with respect to gas exchange in a green plant kept in dark?
A) Only CO₂ is taken in
B) Only O₂ is taken in and CO₂ is released
C) Only O₂ is released
D) Both photosynthesis and respiration stop completely etc.
Q60: Which of these best summarises the relationship between photosynthesis and respiration in the global carbon cycle?
A) Both add CO₂ to atmosphere
B) Both remove CO₂ from atmosphere
C) Photosynthesis removes CO₂ and respiration adds CO₂
D) Neither affects atmospheric CO₂ at all etc.