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BIOLOGY Assertion (A) & Reason (B) MCQ

MODEL PAPER 3 · Rajasthan Board (RBSE) STD 12 Science (Rajasthan - English Medium). 4 questions.

Questions

Assertion (A) & Reason (B) MCQ

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

MCQ 11 Mark
Assertion (A): Siblings are monoparental in origin.
Reason (R): Monoparental progenies are exact copies of the parent.
  • 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:
Sibling are the product of sexual reproduction and commonly biparental in origin. In sexual reproduction meiosis takes place where crossing over occurs. The product of sexual reproduction thus resemble their parents, but this resemblance is never 100%. The monoparental progeny is derived from a single process through the process of mitosis. It possess exact copies of genetic characteristics of the parent.
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MCQ 21 Mark
Assertion (A): Escherichia coli, Shigella sp., and Salmonella sp. are all responsible for diarrhoeal diseases.
Reason (R): Dehydration is common to all types of diarrhoeal diseases and an adequate supply of fluids and electrolytes should be ensured.
  • A
    Assertion and reason both are correct statements and reason is correct explanation for assertion.
  • B
    Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  • C
    Assertion is correct statement but reason is wrong statement.
  • D
    Assertion is wrong statement but reason is correct statement.
Answer
(b) : Assertion and reason both are correct statements but reason is not correct explanation for assertion.
Explanation: Assertion and reason both are correct statements but reason is not correct explanation for assertion.
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MCQ 31 Mark
Assertion (A): DNA fingerprinting is a very quick way to distinguish any two individuals.
Reason (R): Any two individuals in the world except identical twins have not similar VNTR.
  • A
    Assertion and reason both are correct statements and reason is correct explanation for assertion.
  • B
    Assertion and reason both are correct statements but reason is not correct explanation for assertion.
  • C
    Assertion is correct statement but reason is wrong statement.
  • D
    Assertion is wrong statement but reason is correct statement.
Answer
(a) : Assertion and reason both are correct statements and reason is correct explanation for assertion.
Explanation: Assertion and reason both are correct statements and reason is the correct explanation for assertion.
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MCQ 41 Mark
Assertion (A): Appetency is the formation of new structural or habit of the organism according to its need.
Reason (R): It is also called Lamarckian doctrine.
  • 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: According to Lamarck, a change in environment brings about changes in organisms. It gives rise to new needs. New needs or desires produce new structures and change habits of the organisms. Doctrine of desire is called appetency. It can be shown by the following example-Water birds (duck etc.) developed their webbed feet by constant stretching of digits and the skin between them for skimming the water surface and for swimming. The transmission of acquired characters is the most important principle usually termed as the Lamarckian doctrine.
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