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BIOLOGY Assertion & Reason

MODEL PAPER 8 · 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): Tracheae, primary, secondary and tertiary bronchi are supported by incomplete cartilaginous rings.
Reason (R): These rings of cartilage make the wall non-collapsible.
  • 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: The cartilage rings are present in the trachea to prevent it from collapsing. This enables the lumen of trachea to stay open during breathing.
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MCQ 21 Mark
Assertion (A): Potassium is only essential for animals.
Reason (R): Along with sodium is essential for the conduction of impulses in nerve cells.
  • 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
(d) A is false but R is true.
Explanation: Potassium fluxes govern the movements of stomata and the movement of variations in several plants including Mimosa pudica (Seismonasty) and Oxalis (nyctinasty). Its deficiency in plants affects processes such as respiration, photosynthesis, chlorophyll development, and the water content of leaves.
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MCQ 31 Mark
Assertion (A): Medulla is considered as a respiratory centre in animals.
Reason (R): Rate of breathing is regulated by the medulla because of the changes in the O₂ content of the blood.
  • 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 41 Mark
Assertion (A): Mucor, Rhizopus and Albugo fungi are members of Phycomycetes.
Reason (R): The mycelium is aseptate and coenocytic and sexual reproduction takes place by zoospores or by aplanospores.
  • 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: Mucor, Rhizopus, and Albugo are examples of Phycomycetes. Their mycelium is aseptate and coenocytic. Asexual reproduction takes place by zoospores (motile) or by aplanospores (non-motile).
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