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BIOLOGY Assertion & Reason

MODEL PAPER 2 · Gujarat Board (GSEB) STD 11 Science (GSEB - English Medium). 4 questions.

Questions

Assertion & Reason

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4 questions · self-marked practice — reveal the answer and mark yourself.

MCQ 11 Mark
Assertion (A): The amount of $CO2$ that can diffuse through the diffusion membrane per unit difference in partial pressure is much higher compared to that of $O _2$.
Reason (R): The solubility of $CO _2$ is 20-25 times higher than that of $O _2$.
  • 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.
  • D
    A is false but R is true.
Answer
(a) Both A and R are true and R is the correct explanation of A.
Explanation: Both A and R are true and R is the correct explanation of A.
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MCQ 21 Mark
Assertion (A): Elemental analysis gives the elemental composition of living tissues in the form of hydrogen
Reason (R): Wet weight is the weight of living tissue and the remains of living tissue after drying gives dry weight.
  • 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.
  • D
    A is false but R is true.
Answer
(b) Both A and R are true but R is not the correct explanation of A.
Explanation: Living organisms are made of only a small selection of these elements, four of which are carbon, hydrogen, nitrogen, and oxygen make up 96.5% of an organism's weight.
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MCQ 31 Mark
Assertion (A): Inspiration is initiated by the contraction of the diaphragm which increases the volume of the thoracic chamber in the antero-posterior axis.
Reason (R): The contraction of external intercostal muscles lifts up the ribs and the sternum causing an incn in the volume of the thoracic chamber in the dorso-ventral axis.
  • 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.
  • D
    A is false but R is true.
Answer
(b) Both A and R are true but R is not the correct explanation of A.
Explanation: Inspiration is initiated by the contraction of diaphragm which increases the volume of thoracic chamber antero-posterior axis. The contraction of external inter-costal muscles lifts up the ribs and the sternum causing an incr the volume of the thoracic chamber in the dorso-ventral axis.
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MCQ 41 Mark
Assertion (A): Bacteria do not always move with the help of flagella.
Reason (R): Rotary motion of flagellum is employed by flagellated bacteria for movement.
  • 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.
  • D
    A is false but R is true
Answer
(b) Both A and R are true but R is not the correct explanation of A.
Explanation: Myxobacteria do not have flagella and move by gliding movement.
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