أسئلة علم الأحياء الصف الثامن مع الحل

15 سؤالاً تدريبياً في علم الأحياء – الصف الثامن

1. الفصل: Blood and Biological Self · سهل

   1. What is the meaning of "antigen"?

   • A. antigen D of red blood cells; present in Rh+ people, absent in Rh− people
   • B. a non-self molecule recognised by the immune system
   • C. the red protein of red blood cells that binds oxygen
   • D. a blood cell without a nucleus that contains haemoglobin and carries oxygen
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   Answer: a non-self molecule recognised by the immune system

   Explanation: Antigen: a non-self molecule recognised by the immune system

2. الفصل: Blood and Biological Self · سهل

   2. Which term matches this definition: "giving blood from a compatible donor to a recipient"?

   • A. haemoglobin
   • B. transfusion
   • C. red blood cell
   • D. white blood cell
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   Answer: transfusion

   Explanation: Transfusion: giving blood from a compatible donor to a recipient

3. الفصل: The Non-Specific Immune Response · سهل

   3. Which term matches this definition: "the organ behind the breastbone where T lymphocytes mature"?

   • A. fever
   • B. lysosome
   • C. phagocyte
   • D. thymus
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   Answer: thymus

   Explanation: Thymus: the organ behind the breastbone where T lymphocytes mature

4. الفصل: The Non-Specific Immune Response · سهل

   4. What is the meaning of "thymus"?

   • A. the movement of phagocytes towards chemical signals released at the site of infection
   • B. a group of plasma proteins that perforate bacteria and help phagocytosis
   • C. the organ behind the breastbone where T lymphocytes mature
   • D. a microbe (bacterium, virus, fungus, parasite) that causes disease
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   Answer: the organ behind the breastbone where T lymphocytes mature

   Explanation: Thymus: the organ behind the breastbone where T lymphocytes mature

5. الفصل: The Specific Immune Response · سهل

   5. Which term matches this definition: "a protein released by cytotoxic T cells that makes holes in the membrane of the target cell"?

   • A. antibody
   • B. immunoglobulin
   • C. primary response
   • D. perforin
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   Answer: perforin

   Explanation: Perforin: a protein released by cytotoxic T cells that makes holes in the membrane of the target cell

6. الفصل: The Specific Immune Response · سهل

   6. Which cells carry out the specific immune response?

   • A. platelets
   • B. red blood cells
   • C. lymphocytes
   • D. neutrophils
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   Answer: lymphocytes

   Explanation: B and T lymphocytes recognise antigens specifically.

7. الفصل: Activation and Disorders of the Immune System · سهل

   7. Which term matches this definition: "a weakening or absence of the immune defences, innate or acquired"?

   • A. passive immunity
   • B. mast cell
   • C. immunodeficiency
   • D. active immunity
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   Answer: immunodeficiency

   Explanation: Immunodeficiency: a weakening or absence of the immune defences, innate or acquired

8. الفصل: Activation and Disorders of the Immune System · سهل

   8. Which term matches this definition: "a massive generalised allergic reaction with a drop of blood pressure that can be fatal"?

   • A. allergy
   • B. anaphylactic shock
   • C. IgE
   • D. toxoid
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   Answer: anaphylactic shock

   Explanation: Anaphylactic shock: a massive generalised allergic reaction with a drop of blood pressure that can be fatal

9. الفصل: Antisepsis, Asepsis, Chemotherapy and Antibiotherapy · سهل

   9. What is the meaning of "antibiotherapy"?

   • A. describes an antibiotic that only stops bacteria from multiplying
   • B. a resistant resting form of some bacteria that can survive boiling
   • C. a drug that blocks the multiplication of a virus
   • D. the treatment of a bacterial infection with antibiotics
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   Answer: the treatment of a bacterial infection with antibiotics

   Explanation: Antibiotherapy: the treatment of a bacterial infection with antibiotics

10. الفصل: Antisepsis, Asepsis, Chemotherapy and Antibiotherapy · سهل

    10. Which term matches this definition: "the set of measures that prevent a disease before it appears"?

    • A. prophylaxis
    • B. antibiotic resistance
    • C. antisepsis
    • D. antiseptic
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    Answer: prophylaxis

    Explanation: Prophylaxis: the set of measures that prevent a disease before it appears

11. الفصل: Geology: Rock Deposits and the Use of Rocks by Man · سهل

    11. What does geology study?

    • A. the stars and planets
    • B. the Earth, its rocks and their history
    • C. the weather and the clouds
    • D. living cells and their organelles
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    Answer: the Earth, its rocks and their history

    Explanation: Geology is the science of the Earth and its rocks.

12. الفصل: Geology: Rock Deposits and the Use of Rocks by Man · سهل

    12. What is the meaning of "porosity"?

    • A. an open-air site where rocks are extracted for building or industry
    • B. the rule that sediments are deposited in horizontal layers
    • C. the ability of a rock to hold water in the small spaces between its grains
    • D. a rock formed by the cooling and solidification of magma, such as granite or basalt
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    Answer: the ability of a rock to hold water in the small spaces between its grains

    Explanation: Porosity: the ability of a rock to hold water in the small spaces between its grains

13. الفصل: Rock Deformations: Faults and Folds · سهل

    13. What is the meaning of "foliation"?

    • A. a fault along which the blocks slide horizontally past each other
    • B. the arrangement of minerals in parallel sheets in a metamorphic rock
    • C. the tendency of a rock to break when a force acts on it
    • D. the ability of a rock to bend and flow slowly without breaking
    أظهر الجواب ▾

    Answer: the arrangement of minerals in parallel sheets in a metamorphic rock

    Explanation: Foliation: the arrangement of minerals in parallel sheets in a metamorphic rock

14. الفصل: Rock Deformations: Faults and Folds · سهل

    14. Which term matches this definition: "the surface of rupture along which the blocks slide"?

    • A. fault
    • B. fault plane
    • C. limb of a fold
    • D. throw
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    Answer: fault plane

    Explanation: Fault plane: the surface of rupture along which the blocks slide

15. الفصل: Dynamics of the Terrestrial Globe: Lithospheric Plates · سهل

    15. Which term matches this definition: "an underwater volcanic mountain chain where plates diverge and new oceanic crust is made"?

    • A. continental collision
    • B. oceanic ridge
    • C. convergent boundary
    • D. lithospheric plate
    أظهر الجواب ▾

    Answer: oceanic ridge

    Explanation: Oceanic ridge: an underwater volcanic mountain chain where plates diverge and new oceanic crust is made

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