Download App

Principles of Inheritance and Variation — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYPrinciples of Inheritance and Variation1 Mark
MCQ
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Karyotypes study is used to detect of chromosomal aberrations.
Reason: Karyotypes can be used to know the sex of unborn child.
  • A
    Both assertion and reason are true and reason is the correct explanation of assertion.
  • ✓
    Both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    Assertion is true but reason is false.
  • D
    Both assertion and reason are false.
✓

Answer

Correct option: B.
Both assertion and reason are true but reason is not the correct explanation of assertion.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Assertion (A) & Reason (B) MCQ" from Principles of Inheritance and Variation→Principles of Inheritance and Variation — all question types→BIOLOGY STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Assertion (A): Griseofulvin extracted from P. griseofulvum is used for ringworm treatment.
Reason (R): Trichophyton, Epidermophyton, etc. cannot grow well in presence of Penicillium griseofulvum.
→
Assertion $(A):$ The earliest organisms that appeared on the earth were non$-$green and presumably anaerobes.
Reason $(R):$ The first autotrophic organisms were the chemo-autotrophs that never released oxygen.
→
Assertion (A): Most evolutionary trees place information about pattern of relationship on horizontal axis and time on vertical axis.
Reason (R): An evolutionary tree depicts pattern of relationship among parents and offsprings.
→
Silencing of a gene could be achieved through the use of:
→
For question two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Indiscriminate exploitation ofeconomically important wild plants may lead to their extinction.
Reason: Non$-$conservation of their germplasm is responsible for this.
→
Assertion (A): Ormeloxifene, also known as centchroman, is used as a nonsteroidal oral contraceptive.
Reason (R): It causes an asynchrony in the menstrual cycle between ovulation and the development of the uterine lining.
→
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Regulator and operator genes are not associated with constitutive genes
Reason: Constitutive genes need not be repressed.
→
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Pure lines are called true breed.
Reason: True breeds are used for cross breeding.
→
Assertion (A): Primer pheromones bring about physiological changes in the receivers.
Reason (R): Releaser pheromones cause immediate change in the receivers.
→
For question two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion: Amensalism is a negative interaction between two living individuals.
Reason: In amensalism, allochemics are secreted by one individual.
→