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9th Class Biology Chapter 7 MCQs with Answers

9th Class Biology Chapter 7 MCQs

Understand how energy flows in living systems with “Bioenergetics MCQs” for 9th-class biology. This chapter highlights photosynthesis, respiration, and energy transformations. These MCQs will help you grasp the principles of ATP generation and energy utilization, making exam preparation engaging and straightforward.

What is the primary source of energy for most living organisms?
a) Glucose
b) Proteins
c) Lipids
d) Nucleic acids

Answer
a) Glucose

Which molecule is commonly referred to as the “energy currency” of the cell?
a) ATP
b) DNA
c) RNA
d) Glucose

Answer
a) ATP

The process by which cells extract energy from glucose in the presence of oxygen is called:
a) Photosynthesis
b) Glycolysis
c) Fermentation
d) Cellular respiration

Answer
d) Cellular respiration

During cellular respiration, glucose is broken down into:
a) Oxygen and carbon dioxide
b) Water and carbon dioxide
c) ATP and oxygen
d) ATP and carbon dioxide

Answer
b) Water and carbon dioxide

What is the total number of ATP molecules produced from one molecule of glucose during cellular respiration?
a) 2 ATP
b) 36 ATP
c) 38 ATP
d) 40 ATP

Answer
c) 38 ATP

Which stage of cellular respiration occurs in the cytoplasm and does not require oxygen?
a) Glycolysis
b) Krebs cycle
c) Electron transport chain
d) Pyruvate oxidation

Answer
a) Glycolysis

The final electron acceptor in the electron transport chain is:
a) Oxygen
b) Carbon dioxide
c) Glucose
d) NADH

Answer
a) Oxygen

In which organelle does the electron transport chain take place in eukaryotic cells?
a) Nucleus
b) Mitochondria
c) Chloroplasts
d) Endoplasmic reticulum

Answer
b) Mitochondria

Which process involves the synthesis of ATP using energy from a proton gradient across a membrane?
a) Glycolysis
b) Krebs cycle
c) Chemiosmosis
d) Fermentation

Answer
c) Chemiosmosis

What is the net gain of ATP molecules produced during glycolysis?
a) 2 ATP
b) 4 ATP
c) 6 ATP
d) 8 ATP

Answer
a) 2 ATP

Which type of fermentation occurs in human muscle cells during strenuous exercise when oxygen is limited?
a) Lactic acid fermentation
b) Ethanol fermentation
c) Alcoholic fermentation
d) Citric acid fermentation

Answer
a) Lactic acid fermentation

The process of converting light energy into chemical energy in plants is known as:
a) Cellular respiration
b) Photosynthesis
c) Fermentation
d) Glycolysis

Answer
b) Photosynthesis

In photosynthesis, oxygen is released as a byproduct during:
a) The light-dependent reactions
b) The Calvin cycle
c) Glycolysis
d) The Krebs cycle

Answer
a) The light-dependent reactions

The light-absorbing pigments in chloroplasts responsible for capturing solar energy are called:
a) Xanthophylls
b) Chlorophylls
c) Carotenoids
d) Phycobilins

Answer
b) Chlorophylls

During the light-dependent reactions of photosynthesis, water molecules are split, releasing:
a) Oxygen and ATP
b) Carbon dioxide and ATP
c) Oxygen and NADPH
d) Carbon dioxide and NADPH

Answer
c) Oxygen and NADPH

The Calvin cycle is responsible for:
a) Absorbing light energy
b) Producing ATP
c) Fixing carbon dioxide into glucose
d) Splitting water molecules

Answer
c) Fixing carbon dioxide into glucose

Which organelle is the site of photosynthesis in plant cells?
a) Mitochondria
b) Nucleus
c) Chloroplasts
d) Endoplasmic reticulum

Answer
c) Chloroplasts

The process by which plants convert light energy into chemical energy in the absence of oxygen is called:
a) Cellular respiration
b) Photosynthesis
c) Fermentation
d) Glycolysis

Answer
b) Photosynthesis

The energy to convert ADP to ATP during photosynthesis comes from:
a) Light energy
b) Heat energy
c) Chemical energy
d) Kinetic energy

Answer
a) Light energy

The final product of the Calvin cycle is:
a) Glucose
b) Water
c) Carbon dioxide
d) ATP

Answer
a) Glucose

In which part of the chloroplast do the light-dependent reactions occur?
a) Thylakoid membrane
b) Stroma
c) Outer membrane
d) Inner membrane

Answer
a) Thylakoid membrane

Which molecule acts as an electron carrier during cellular respiration and photosynthesis?
a) NADPH
b) NADH
c) FADH2
d) ADP

Answer
b) NADH

What is the function of NADPH in photosynthesis?
a) To transfer high-energy electrons to the Calvin cycle
b) To transfer high-energy electrons to the electron transport chain
c) To convert ATP to ADP
d) To produce oxygen during the light-dependent reactions

Answer
a) To transfer high-energy electrons to the Calvin cycle

The light-independent reactions of photosynthesis occur in the:
a) Stroma
b) Thylakoid membrane
c) Inner membrane
d) Outer membrane

Answer
a) Stroma

Which molecule is the primary product of the light-dependent reactions in photosynthesis?
a) Glucose
b) Oxygen
c) NADPH
d) ATP

Answer
d) ATP

In which part of the chloroplast does the Calvin cycle take place?
a) Thylakoid membrane
b) Stroma
c) Outer membrane
d) Inner membrane

Answer
b) Stroma

During photosynthesis, carbon dioxide is reduced to form:
a) Water
b) Glucose
c) Oxygen
d) ATP

Answer
b) Glucose

The process of capturing light energy to convert water and carbon dioxide into glucose is known as:
a) Glycolysis
b) Photosynthesis
c) Fermentation
d) Cellular respiration

Answer
b) Photosynthesis

Which of the following organisms carries out photosynthesis?
a) Animals
b) Fungi
c) Bacteria
d) Plants

Answer
d) Plants

The primary pigment involved in capturing light energy for photosynthesis is:
a) Chlorophyll
b) Carotenoid
c) Xanthophyll
d) Phycobilin

Answer
a) Chlorophyll

What is the main function of the light-dependent reactions in photosynthesis?
a) To produce glucose
b) To produce ATP and NADPH
c) To convert carbon dioxide into oxygen
d) To fix carbon dioxide

Answer
b) To produce ATP and NADPH

The process of splitting water molecules during the light-dependent reactions of photosynthesis is known as:
a) Photolysis
b) Glycolysis
c) Fermentation
d) Krebs cycle

Answer
a) Photolysis

The Calvin cycle is also known as:
a) Dark reactions
b) Light reactions
c) Fermentation reactions
d) Glycolysis reactions

Answer
a) Dark reactions

During photosynthesis, the oxygen released as a byproduct comes from:
a) Carbon dioxide
b) Water
c) Glucose
d) ATP

Answer
b) Water

The energy needed to drive the synthesis of ATP during photosynthesis comes from:
a) Oxygen
b) Carbon dioxide
c) Light energy
d) Glucose

Answer
c) Light energy

Which type of fermentation occurs in yeast cells, producing alcohol and carbon dioxide?
a) Lactic acid fermentation
b) Ethanol fermentation
c) Alcoholic fermentation
d) Citric acid fermentation

Answer
c) Alcoholic fermentation

In cellular respiration, the majority of ATP is produced during:
a) Glycolysis
b) The Krebs cycle
c) Fermentation
d) The electron transport chain

Answer
d) The electron transport chain

The process by which cells extract energy from glucose without the presence of oxygen is called:
a) Photosynthesis
b) Glycolysis
c) Fermentation
d) Cellular respiration

Answer
c) Fermentation

The energy currency used by cells to perform work is:
a) NADH
b) NADPH
c) ATP
d) ADP

Answer
c) ATP

Which of the following is a product of the Krebs cycle?
a) ATP
b) Carbon dioxide
c) Glucose
d) Water

Answer
b) Carbon dioxide

During glycolysis, one molecule of glucose is converted into:
a) Two molecules of pyruvate
b) Two molecules of carbon dioxide
c) Two molecules of water
d) Two molecules of ATP

Answer
a) Two molecules of pyruvate

Which of the following is NOT a part of cellular respiration?
a) Glycolysis
b) Krebs cycle
c) Photosynthesis
d) Electron transport chain

Answer
c) Photosynthesis

Which stage of cellular respiration produces the majority of NADH and FADH2?
a) Glycolysis
b) Krebs cycle
c) Electron transport chain
d) Pyruvate oxidation

Answer
b) Krebs cycle

During cellular respiration, pyruvate is converted into acetyl-CoA in a process called:
a) Glycolysis
b) Krebs cycle
c) Fermentation
d) Pyruvate oxidation

Answer
d) Pyruvate oxidation

The first step of cellular respiration, where glucose is split into two molecules of pyruvate, is called:
a) Glycolysis
b) Krebs cycle
c) Fermentation
d) Electron transport chain

Answer
a) Glycolysis

What is the purpose of the Krebs cycle in cellular respiration?
a) To produce ATP
b) To convert glucose into pyruvate
c) To generate NADH and FADH2
d) To release oxygen as a byproduct

Answer
c) To generate NADH and FADH2

The molecule that serves as the final electron acceptor in the electron transport chain is:
a) Water
b) Oxygen
c) Carbon dioxide
d) Glucose

Answer
b) Oxygen

Which stage of cellular respiration produces the most ATP molecules?
a) Glycolysis
b) Krebs cycle
c) Fermentation
d) Electron transport chain

Answer
d) Electron transport chain

Which of the following is NOT a product of cellular respiration?
a) Carbon dioxide
b) Water
c) Glucose
d) ATP

Answer
c) Glucose

During cellular respiration, the electron transport chain is located in the:
a) Mitochondrial matrix
b) Mitochondrial inner membrane
c) Mitochondrial outer membrane
d) Mitochondrial intermembrane space

Answer
b) Mitochondrial inner membrane

The process of converting glucose into pyruvate during glycolysis occurs in the:
a) Cytoplasm
b) Mitochondrial matrix
c) Mitochondrial inner membrane
d) Mitochondrial intermembrane space

Answer
a) Cytoplasm

What is the purpose of the electron transport chain in cellular respiration?
a) To produce ATP
b) To convert glucose into pyruvate
c) To generate NADH and FADH2
d) To release oxygen as a byproduct

Answer
a) To produce ATP

Which molecule is the final product of glycolysis?
a) Oxygen
b) Carbon dioxide
c) Pyruvate
d) ATP

Answer
c) Pyruvate

In cellular respiration, the carbon atoms from glucose end up as:
a) Water
b) Carbon dioxide
c) ATP
d) NADH

Answer
b) Carbon dioxide

What is the net gain of ATP molecules produced during glycolysis?
a) 2 ATP
b) 4 ATP
c) 6 ATP
d) 8 ATP

Answer
a) 2 ATP

Which of the following processes does NOT occur during cellular respiration?
a) Glycolysis
b) Krebs cycle
c) Electron transport chain
d) Calvin cycle

Answer
d) Calvin cycle

In cellular respiration, where is the majority of ATP produced?
a) Glycolysis
b) Krebs cycle
c) Electron transport chain
d) Pyruvate oxidation

Answer
c) Electron transport chain

The process by which cells convert glucose into pyruvate is known as:
a) Glycolysis
b) Photosynthesis
c) Fermentation
d) Cellular respiration

Answer
a) Glycolysis

In which organelle does cellular respiration occur in eukaryotic cells?
a) Nucleus
b) Mitochondria
c) Chloroplasts
d) Endoplasmic reticulum

Answer
b) Mitochondria

The molecule that carries high-energy electrons during cellular respiration is:
a) NADH
b) NADPH
c) FADH2
d) ADP

Answer
a) NADH

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See Also  9th Class Biology Chapter 1 MCQs with Answers
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