Biology Quiz for Grade 11

Topic: Enzymes, Biochemical Reactions, ATP, Energy Flow through Ecosystems, Photosynthesis, Cellular Respiration

Questions

What is the primary function of enzymes in biological systems?
- A. To provide energy for cellular processes
- B. To catalyze chemical reactions
- C. To store genetic information
- D. To form cell membranes
What is the role of ATP in cellular metabolism?
- A. It acts as a structural component of cell membranes.
- B. It serves as a primary energy currency in cells.
- C. It replicates DNA.
- D. It synthesizes proteins.
Which factor does NOT affect enzyme activity?
- A. Temperature
- B. pH
- C. Substrate concentration
- D. The color of the enzyme
What is produced during the light-dependent reactions of photosynthesis?
- A. Glucose
- B. Oxygen
- C. Carbon dioxide
- D. Water
In which organelle does cellular respiration primarily occur?
- A. Nucleus
- B. Ribosome
- C. Mitochondria
- D. Chloroplast
What is the function of NADH in cellular respiration?
- A. It directly produces ATP.
- B. It acts as an electron carrier.
- C. It converts glucose into starch.
- D. It synthesizes DNA.
Which of the following is a product of glycolysis?
- A. Lactic acid
- B. Ethanol
- C. Pyruvate
- D. ATP synthase
What is the primary pigment involved in photosynthesis?
- A. Chlorophyll
- B. Carotenoids
- C. Hemoglobin
- D. Myoglobin
During which stage of photosynthesis is carbon dioxide fixed into organic molecules?
- A. Light-dependent reactions
- B. Calvin cycle
- C. Glycolysis
- D. Krebs cycle
What happens to the energy stored in glucose during cellular respiration?
- A. It is lost as heat.
- B. It is converted into ATP.
- C. It is stored as fat.
- D. It is used to synthesize proteins.
What is the final electron acceptor in the electron transport chain?
- A. Oxygen
- B. Carbon dioxide
- C. Water
- D. NADH
Which of the following statements about enzymes is true?
- A. Enzymes raise the activation energy of reactions.
- B. Enzymes are consumed in reactions.
- C. Enzymes only work in alkaline conditions.
- D. Enzymes lower the activation energy of reactions.
In which process is lactic acid produced?
- A. Aerobic respiration
- B. Glycolysis under anaerobic conditions
- C. Krebs cycle
- D. Photosynthesis
What is the main purpose of the Calvin cycle in photosynthesis?
- A. To capture sunlight
- B. To convert carbon dioxide into glucose
- C. To produce oxygen
- D. To generate ATP directly
Which molecule is known as the energy transporter within cells?
- A. DNA
- B. RNA
- C. ATP
- D. NADPH
What type of relationship does energy flow through an ecosystem demonstrate?
- A. Linear
- B. Cyclical
- C. Random
- D. Unidirectional
During cellular respiration, what is the overall reaction?
- A. Glucose + Oxygen → Carbon Dioxide + Water + Energy
- B. Carbon Dioxide + Water → Glucose + Oxygen
- C. Glucose + Oxygen → Water + Heat
- D. Light + Water → Glucose + Oxygen
Where does the Krebs cycle occur in eukaryotic cells?
- A. Cytoplasm
- B. Nucleus
- C. Mitochondrial matrix
- D. ER (Endoplasmic Reticulum)
What is the significance of the electron transport chain in cellular respiration?
- A. It produces glucose.
- B. It generates the majority of ATP.
- C. It synthesizes ribosomes.
- D. It fixes nitrogen.
What by-product is produced during alcoholic fermentation?
- A. Lactic acid
- B. Ethanol
- C. Acetic acid
- D. Glucose

Correct Answers

This quiz covers essential concepts related to enzymes, biochemical reactions, ATP, energy flow through ecosystems, photosynthesis, and cellular respiration suitable for Year 11 biology students.

What to create	Exam
Which subject	Biology
What age group	Year or Grade 11
What topic	Enzymes and Biochemical Reactions,Adenosine TriphosphateEnergy Flow through EcosystemsPhotosynthesisCellular Respiration
Question types	Close-ended
Number of questions	20
Number of answers	4
Correct answers	Exactly 1
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