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BIOLOGY Assertion & Reason

MODEL PAPER 10 · Gujarat Board (GSEB) STD 11 Science (GSEB - English Medium). 4 questions.

Questions

Assertion & Reason

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4 questions · timed · auto-graded

MCQ 11 Mark
Assertion (A): Erythrocytes can carry out anaerobic metabolism only.
Reason (R): In erythrocytes, carbon-dioxide is converted into bicarbonates.
  • 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: Both A and R are true but R is not the correct explanation of A
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MCQ 21 Mark
Assertion (A): Proteins are a heteropolymer.
Reason (R): Dietary proteins are the source of non-essential amino acids.
  • 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
(c) A is true but R is false.
Explanation: Each individual protein is a polymer of amino acids. As there are 20 types of amino acids, a protein is a heteropolymer and not a homopolymer. Amino acids can be essential or non-essential. Certain amino acids are essential for our health and they have to be supplied through our diet. Dietary proteins are thus, a source of essential amino acids. Non-essential amino acids are those amino acids that are synthesized in our bodies.
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MCQ 31 Mark
Assertion (A): Exchange of $O _2$ and $CO _2$ in respiration mainly based on pressure/concentration gradient.
Reason (R): Solubility of the gases as well as the thickness of the membranes involved in diffusion is also can affect the rate of diffusion
  • 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: Both A and R are true but R is not the correct explanation of A..
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MCQ 41 Mark
Assertion (A): The protist feeds on red blood corpuscles.
Reason (R): Amoebiasis is caused by Amoeba
  • 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
(c) A is true but R is false.
Explanation: A person suffering from amoebic dysentery has repeated blood mixed with slimy and foul-smelling motions. The protist feeds on red blood corpuscles by damaging the wall of the large intestine and reaching the blood capillaries.
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Assertion & Reason - BIOLOGY STD 11 Science Questions - Vidyadip