Grade 9 Biology Questions and Answers
A free sample of Grade 9 Biology practice questions with the correct answer and an explanation, following the Lebanese curriculum. Useful for revision before school tests and the Brevet.
أسئلة علوم الحياة للصف 9 مع الأجوبة والشرح وفق المنهج اللبناني.
How to use this page: read each question, try to answer it yourself, then open the answer to check your reasoning. Questions are grouped by the chapter they belong to on EduRise, in the order of the Lebanese Grade 9 Biology programme.
15 Grade 9 Biology practice questions
Chapter: From Food to Nutrients: Digestion · easy
1. Starch is digested into…
- A. fatty acids
- B. glucose
- C. amino acids
- D. vitamins
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Answer: glucose
Explanation: Starch → maltose → glucose.
Chapter: From Food to Nutrients: Digestion · easy
2. What is the main nutrient family in labneh?
- A. starch (carbohydrate)
- B. proteins
- C. lipids
- D. proteins and lipids
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Answer: proteins and lipids
Explanation: labneh: mainly proteins and lipids.
Chapter: The Use of Nutrients and Oxygen · easy
3. Blood entering a muscle carries 20 mL of O₂ per 100 mL; blood leaving it carries 12 mL. How many mL of O₂ per 100 mL did the muscle use?
- A. 20
- B. 8
- C. 12
- D. 32
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Answer: 8
Explanation: 20 − 12 = 8 mL — a resting muscle.
Chapter: The Use of Nutrients and Oxygen · easy
4. Which term matches this definition: "the energy released by the oxidation of one gram of a nutrient, in kJ/g"?
- A. essential amino acid
- B. anabolism
- C. energy value
- D. urea
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Answer: energy value
Explanation: Energy value: the energy released by the oxidation of one gram of a nutrient, in kJ/g
Chapter: Nutrition and Health · easy
5. One can of soda contains about 35 g of sugar. How many grams of sugar in 5 cans?
- A. 35
- B. 175
- C. 210
- D. 140
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Answer: 175
Explanation: 5 × 35 = 175 g (about 35 teaspoons).
Chapter: Nutrition and Health · easy
6. One can of soda contains about 35 g of sugar. How many grams of sugar in 2 cans?
- A. 70
- B. 35
- C. 105
- D. 14
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Answer: 70
Explanation: 2 × 35 = 70 g (about 14 teaspoons).
Chapter: Oxygen Uptake and Carbon Dioxide Release: Respiration · easy
7. During exercise: 35 breaths per minute of 2.5 L. Volume ventilated per minute?
- A. 37.5
- B. 87.5
- C. 43.75
- D. 175
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Answer: 87.5
Explanation: 35 × 2.5 = 87.5 L/min.
Chapter: Oxygen Uptake and Carbon Dioxide Release: Respiration · easy
8. Which term matches this definition: "the part of the brain stem that automatically controls the breathing rate"?
- A. emphysema
- B. bronchi
- C. respiratory centre
- D. ventilation
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Answer: respiratory centre
Explanation: Respiratory centre: the part of the brain stem that automatically controls the breathing rate
Chapter: Transport and Distribution of Nutrients and Oxygen: Circulation · easy
9. Blood is about 8 % of body mass. Blood volume (in L, 1 L ≈ 1 kg) of a 70 kg person?
- A. 7.1
- B. 3.6
- C. 6.6
- D. 5.6
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Answer: 5.6
Explanation: 70 × 8 / 100 = 5.6 L.
Chapter: Transport and Distribution of Nutrients and Oxygen: Circulation · easy
10. What is the meaning of "plasma"?
- A. the relaxation phase of the heart during which it fills
- B. the largest artery, leaving the left ventricle to supply the whole body
- C. the liquid part of the blood carrying dissolved nutrients, salts and wastes
- D. a lower chamber of the heart that pumps blood into an artery
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Answer: the liquid part of the blood carrying dissolved nutrients, salts and wastes
Explanation: Plasma: the liquid part of the blood carrying dissolved nutrients, salts and wastes
Chapter: Regulation of the Internal Medium: Urinary Function · easy
11. Which term matches this definition: "the cleaning of the blood by an artificial kidney when the kidneys fail"?
- A. renal artery
- B. internal medium
- C. ADH
- D. dialysis
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Answer: dialysis
Explanation: Dialysis: the cleaning of the blood by an artificial kidney when the kidneys fail
Chapter: Regulation of the Internal Medium: Urinary Function · easy
12. What is the meaning of "filtration"?
- A. the liquid filtered in the glomerulus, like plasma without proteins
- B. the ball of capillaries where blood is filtered into Bowman's capsule
- C. a crystal of salts formed in concentrated urine
- D. the passage of water and small molecules from the blood into the nephron under pressure
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Answer: the passage of water and small molecules from the blood into the nephron under pressure
Explanation: Filtration: the passage of water and small molecules from the blood into the nephron under pressure
Chapter: Chromosomes, Carriers of the Genetic Information · easy
13. What is the meaning of "homologous chromosomes"?
- A. any chromosome that is not a sex chromosome (pairs 1 to 22 in humans)
- B. the complete set of genes of a species, about 20 000 in humans
- C. the part of the cell that contains the chromosomes and controls its activity
- D. the two chromosomes of a pair, one from each parent, carrying the same genes
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Answer: the two chromosomes of a pair, one from each parent, carrying the same genes
Explanation: Homologous chromosomes: the two chromosomes of a pair, one from each parent, carrying the same genes
Chapter: Chromosomes, Carriers of the Genetic Information · easy
14. The body cells of the pea have 14 chromosomes. How many chromosomes in its gametes?
- A. 8
- B. 7
- C. 14
- D. 28
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Answer: 7
Explanation: Gametes are haploid: 14 / 2 = 7.
Chapter: Transmission of the Genetic Information · easy
15. Which term matches this definition: "a change in the sequence of DNA"?
- A. mutation
- B. cancer
- C. metaphase
- D. replication
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Answer: mutation
Explanation: Mutation: a change in the sequence of DNA
More practice
These are sample questions only. The full Grade 9 Biology course on EduRise includes every chapter, lessons, 1,349 questions and timed exams.
Biology questions in other grades
Other Grade 9 subjects
See also: Grade 9 Biology chapters · All question pages · Study guides
About these questions
Where do these Grade 9 Biology questions come from?
They are a sample from EduRise's Grade 9 Biology question bank (1,349 questions across 13 chapters), written to follow the Lebanese curriculum. Each chapter on EduRise has its own practice set and a timed exam.
Are the answers explained?
Yes. Every question on EduRise shows the correct answer and an explanation after you answer, in practice mode and in the exam review.
How do I get the full question bank?
Register at edurise.me and subscribe ($10/month) to practise every chapter of Grade 9 Biology, take the timed exams and track your progress.
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