NEETBotanyPlant - Growth and Development
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Some seeds fail to germinate even when external conditions like moisture, oxygen, and temperature are highly favourable. Reason (R): Such seeds are under endogenous control due to factors like immature embryos or the presence of chemical inhibitors such as phenolic acids. In the light of the above
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- BBoth (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
Correct answer
A. Both (A) and (R) are true and (R) is the correct explanation of (A)
Step-by-step solution
Assertion (A) is true because some seeds do not germinate even under favourable external conditions of moisture, oxygen, and temperature. This phenomenon is known as seed dormancy. Reason (R) is true and correctly explains the Assertion. The failure to germinate under favourable external conditions is because the seeds are under endogenous control (conditions within the seed itself). These endogenous factors include impermeable and hard seed coats, immature embryos, and the presence of chemical inhibitors such as a