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BIOLOGY Assertion & Reason

MODEL PAPER 1 · Rajasthan Board (RBSE) STD 11 Science (Rajasthan - 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): Hippocrates is known as father of Biology.
Reason (R): Hippocrates gave binomial classification of organisms.
Answer
(d) Both A and R are false
Explanation: Hippocrates is known as the father of medicine. Aristotle is the father of biology. Binomial nomenclature was popularized by Carolus Linnaeus.
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MCQ 21 Mark
Assertion (A): Receptors associated with the aortic arch and carotid artery also can recognize changes in CO2 and H concentration.
Reason (R): It sends necessary signals to the rhythm centre for remedial actions.
  • 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 31 Mark
Assertion (A): Enzymes of glycolysis are constitutive enzymes.
Reason (R): They are present over mitochondrial cristae.
  • 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: Constitutive enzymes are those, which are always present because of their requirement for a vital process, e.g. enzymes of glycolysis. These enzymes are present in the cytoplasm.
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MCQ 41 Mark
Assertion (A): Abdominal muscle is related with respiration in animals.
Reason (R): Relaxation of abdominal muscles draws in air.
Answer
(a) Both A and R are true and R is the correct explanation of A.
Explanation: In higher group of animals, respiratory process is directly related with abdominal muscles. Relaxation of abdominal muscles draws in air through spiracles, tracheae and tracheole. This air enters the body fluid through terminal opening & tracheoles. It then diffuses through the body fluid to reach the cells. Contraction of abdominal muscles drives air out from the tracheal system through spiracles. This back and forth movement of abdominal muscles regulates the whole respiratory process.
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