Download App

BIOLOGY Assertion & Reason

MODEL PAPER 4 · Rajasthan Board (RBSE) STD 11 Science (Rajasthan - English Medium). 4 questions.

Questions

Assertion & Reason

Take a timed test

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

MCQ 11 Mark
Assertion (A): Acervulus is a structure which bears conidiophores.
Reason (R): Conidiophores consists of setae.
  • 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: Acervulus is a saucer-shaped structure consisting of stromate mass of hyphae and a fertile layer of conidiophores. Intermingled with the conidiophores are sometimes found dark, long, stiff bristles. These are called the setae.

Image
View full question & answer→
MCQ 21 Mark
Assertion (A): Pneumotaxic centre present in the pons region of the brain.
Reason (R): Neural signal from this centre can reduce the duration of inspiration and thereby alter the respiratory rate.
  • 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.
View full question & answer→
MCQ 31 Mark
Assertion (A): Inspiration can occur if the pressure within the lungs (intrapulmonary pressure) is less than the atmospheric pressure.
Reason (R): Expiration takes place when the intrapulmonary pressure is higher than the atmospheric pressure
  • 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.
View full question & answer→
MCQ 41 Mark
Assertion (A): In condensation, a molecule of water is eliminated.
Reason (R): Condensation is an energy-releasing process.
  • 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: Polymerization or condensation is an energy-requiring anabolic process. A molecule of water is eliminated in the region of condensation of two macromolecular residues.
View full question & answer→
Generate Paper FreeAll MODEL PAPER 4 topics