أسئلة علم الأحياء الصف التاسع مع الحل

15 سؤالاً تدريبياً في علم الأحياء – الصف التاسع

1. الفصل: From Food to Nutrients: Digestion · سهل

   1. Starch is digested into…

   • A. fatty acids
   • B. glucose
   • C. amino acids
   • D. vitamins
   أظهر الجواب ▾

   Answer: glucose

   Explanation: Starch → maltose → glucose.

2. الفصل: From Food to Nutrients: Digestion · سهل

   2. What is the main nutrient family in labneh?

   • A. starch (carbohydrate)
   • B. proteins
   • C. lipids
   • D. proteins and lipids
   أظهر الجواب ▾

   Answer: proteins and lipids

   Explanation: labneh: mainly proteins and lipids.

3. الفصل: The Use of Nutrients and Oxygen · سهل

   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
   أظهر الجواب ▾

   Answer: 8

   Explanation: 20 − 12 = 8 mL — a resting muscle.

4. الفصل: The Use of Nutrients and Oxygen · سهل

   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
   أظهر الجواب ▾

   Answer: energy value

   Explanation: Energy value: the energy released by the oxidation of one gram of a nutrient, in kJ/g

5. الفصل: Nutrition and Health · سهل

   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
   أظهر الجواب ▾

   Answer: 175

   Explanation: 5 × 35 = 175 g (about 35 teaspoons).

6. الفصل: Nutrition and Health · سهل

   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
   أظهر الجواب ▾

   Answer: 70

   Explanation: 2 × 35 = 70 g (about 14 teaspoons).

7. الفصل: Oxygen Uptake and Carbon Dioxide Release: Respiration · سهل

   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
   أظهر الجواب ▾

   Answer: 87.5

   Explanation: 35 × 2.5 = 87.5 L/min.

8. الفصل: Oxygen Uptake and Carbon Dioxide Release: Respiration · سهل

   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
   أظهر الجواب ▾

   Answer: respiratory centre

   Explanation: Respiratory centre: the part of the brain stem that automatically controls the breathing rate

9. الفصل: Transport and Distribution of Nutrients and Oxygen: Circulation · سهل

   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
   أظهر الجواب ▾

   Answer: 5.6

   Explanation: 70 × 8 / 100 = 5.6 L.

10. الفصل: Transport and Distribution of Nutrients and Oxygen: Circulation · سهل

    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
    أظهر الجواب ▾

    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

11. الفصل: Regulation of the Internal Medium: Urinary Function · سهل

    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
    أظهر الجواب ▾

    Answer: dialysis

    Explanation: Dialysis: the cleaning of the blood by an artificial kidney when the kidneys fail

12. الفصل: Regulation of the Internal Medium: Urinary Function · سهل

    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
    أظهر الجواب ▾

    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

13. الفصل: Chromosomes, Carriers of the Genetic Information · سهل

    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
    أظهر الجواب ▾

    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

14. الفصل: Chromosomes, Carriers of the Genetic Information · سهل

    14. The body cells of the pea have 14 chromosomes. How many chromosomes in its gametes?

    • A. 8
    • B. 7
    • C. 14
    • D. 28
    أظهر الجواب ▾

    Answer: 7

    Explanation: Gametes are haploid: 14 / 2 = 7.

15. الفصل: Transmission of the Genetic Information · سهل

    15. Which term matches this definition: "a change in the sequence of DNA"?

    • A. mutation
    • B. cancer
    • C. metaphase
    • D. replication
    أظهر الجواب ▾

    Answer: mutation

    Explanation: Mutation: a change in the sequence of DNA

المزيد من التدريب

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