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Science Assertion (A) & Reason (B) MCQ

Life Processes in Animals · Gujarat Board (GSEB) STD 7 (GSEB - English Medium). 19 questions.

Questions

Assertion (A) & Reason (B) MCQ

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19 questions · auto-graded multiple-choice test.

MCQ 11 Mark
Assertion (A): Oxygen is the final product of respiration.
Reason (R): Respiration produces water, carbon dioxide, and energy.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true, but R is not the correct explanation of A.
  • C
    A is true, but R is false.
  • ✓
    A is false, but R is true.
Answer
Correct option: D.
A is false, but R is true.
D
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MCQ 21 Mark
Assertion(A): Inhalation is caused by the expansion of the chest cavity.
Reason (R): The diaphragm contracts during inhalation.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true, but R is not the correct explanation of A.
  • C
    A is true, but R is false.
  • D
    A is false, but R is true.
Answer
Correct option: A.
Both A and R are true and R is the correct explanation of A.
A
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MCQ 31 Mark
Assertion (A): The pancreas is part of the respiratory system.
Reason (R): The pancreas produces pancreatic juice that is basic in nature.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true, but R is not the correct explanation of A.
  • C
    A is true, but R is false.
  • ✓
    A is false, but R is true.
Answer
Correct option: D.
A is false, but R is true.
D
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MCQ 41 Mark
Assertion (A): The oesophagus is involved in gas exchange.
Reason (R): The oesophagus connects the mouth to the stomach.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true, but R is not the correct explanation of A.
  • C
    A is true, but R is false.
  • ✓
    A is false, but R is true.
Answer
Correct option: D.
A is false, but R is true.
D
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MCQ 51 Mark
Assertion (A): Churning of food takes place in the stomach.
Reason (R): The walls of the stomach contract and relax to churn the food.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true, but R is not the correct explanation of A.
  • C
    A is true, but R is false.
  • D
    A is false, but R is true.
Answer
Correct option: A.
Both A and R are true and R is the correct explanation of A.
A
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MCQ 61 Mark
Assertion (A): The small intestine is longer than the large intestine.
Reason (R): The small intestine is 1.5 m long.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true, but R is not the correct explanation of A.
  • ✓
    A is true, but R is false.
  • D
    A is false, but R is true.
Answer
Correct option: C.
A is true, but R is false.
C
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MCQ 71 Mark
Assertion (A): Alveoli increase the surface area of the lungs.
Reason (R): Greater surface area improves gas exchange.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true, but R is not the correct explanation of A.
  • C
    A is true, but R is false.
  • D
    A is false, but R is true.
Answer
Correct option: A.
Both A and R are true and R is the correct explanation of A.
A
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MCQ 81 Mark
Assertion (A): The nose filters and moistens the air we breathe.
Reason (R): Tiny hairs and mucus help trap dust particles.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true, but R is not the correct explanation of A.
  • C
    A is true, but R is false.
  • D
    A is false, but R is true.
Answer
Correct option: A.
Both A and R are true and R is the correct explanation of A.
A
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MCQ 91 Mark
Assertion (A): The small intestine is the main site for absorption of nutrients.
Reason (R): The inner walls of the small intestine have finger-like projections.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true, but R is not the correct explanation of A.
  • C
    A is true, but R is false.
  • D
    A is false, but R is true.
Answer
Correct option: A.
Both A and R are true and R is the correct explanation of A.
A
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MCQ 101 Mark
Assertion (A): Alveoli are found in the stomach.
Reason (R): Alveoli help in gas exchange.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true, but R is not the correct explanation of A.
  • C
    A is true, but R is false.
  • ✓
    A is false, but R is true.
Answer
Correct option: D.
A is false, but R is true.
D
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MCQ 111 Mark
Assertion (A): The liver secretes bile juice.
Reason (R): Bile juice is stored in the small intestine.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • ✓
    A is true but R is false.
  • D
    A is false but R is true
Answer
Correct option: C.
A is true but R is false.
C
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MCQ 121 Mark
Assertion (A): Diaphragm moves upward during exhalation.
Reason (R): The process of exhalation reduces chest cavity space.
  • ✓
    Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
  • B
    Both Assertion (A) and Reason (R) are true, but (R) is not the correct explanation of (A).
  • C
    (A) is true, but (R) is false.
  • D
    (A) is false, but (R) is true.
Answer
Correct option: A.
Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
A
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MCQ 131 Mark
Assertion (A): Pancreas secretes bile into small intestine.
Reason (R): Bile is secreted by the liver.
  • A
    Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
  • B
    Both Assertion (A) and Reason (R) are true, but (R) is not the correct explanation of (A).
  • C
    (A) is true, but (R) is false.
  • ✓
    (A) is false, but (R) is true.
Answer
Correct option: D.
(A) is false, but (R) is true.
D
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MCQ 141 Mark
Assertion (A): Lime water turns milky when exhaled air is passed.
Reason (R): Exhaled air contains carbon dioxide.
  • ✓
    Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
  • B
    Both Assertion (A) and Reason (R) are true, but (R) is not the correct explanation of (A).
  • C
    (A) is true, but (R) is false.
  • D
    (A) is false, but (R) is true.
Answer
Correct option: A.
Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
A
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MCQ 151 Mark
Assertion (A): All mammals are ruminants.
Reason (R): Ruminants chew the cud.
  • A
    Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
  • B
    Both Assertion (A) and Reason (R) are true, but (R) is not the correct explanation of (A).
  • C
    (A) is true, but (R) is false.
  • ✓
    (A) is false, but (R) is true.
Answer
Correct option: D.
(A) is false, but (R) is true.
D
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MCQ 161 Mark
Assertion (A): Birds break food using gizzards.
Reason (R): All the birds lack teeth.
  • ✓
    Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
  • B
    Both Assertion (A) and Reason (R) are true, but (R) is not the correct explanation of (A).
  • C
    (A) is true, but (R) is false.
  • D
    (A) is false, but (R) is true.
Answer
Correct option: A.
Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
A
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MCQ 171 Mark
Assertion (A): Alveoli are involved in excretion.
Reason (R): Lungs contain numerous alveoli to remove$CO _2$ from blood.
  • A
    Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
  • B
    Both Assertion (A) and Reason (R) are true, but (R) is not the correct explanation of (A).
  • C
    (A) is true, but (R) is false.
  • ✓
    (A) is false, but (R) is true.
Answer
Correct option: D.
(A) is false, but (R) is true.
D
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MCQ 181 Mark
Assertion (A): Villi increase surface area in small intestine.
Reason (R): Villi help in the absorption of nutrients.
  • ✓
    Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
  • B
    Both Assertion (A) and Reason (R) are true, but (R) is not the correct explanation of (A).
  • C
    (A) is true, but (R) is false.
  • D
    (A) is false, but (R) is true.
Answer
Correct option: A.
Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
A
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MCQ 191 Mark
Assertion (A): Bile helps in digestion.
Reason (R): Bile breaks down proteins present in our food.
  • A
    Both Assertion (A) and Reason (R) are true, and (R) is the correct explanation of (A).
  • B
    Both Assertion (A) and Reason (R) are true, but (R) is not the correct explanation of (A).
  • ✓
    (A) is true, but (R) is false.
  • D
    (A) is false, but (R) is true.
Answer
Correct option: C.
(A) is true, but (R) is false.
C
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