Basic Physics

• Statement (I) is Incorrect: The Indian Council of Forestry Research and Education (ICFRE) was constituted in 1986 (not 1985) as an umbrella organisation under the Ministry of Environment and Forests, Government of India.
• Statement (II) is Correct: ICFRE was declared an autonomous Council under the Ministry in June 1991 (formally registered under the Societies Registration Act, 1860, on 12 June 1991) to oversee forestry research and extension in India.
• Conclusion: Statement (I) is incorrect but Statement (II) is correct.

• Botanical Survey of India (BSI):
• Apex taxonomic and floristic research organization under the Government of India, headquartered in Kolkata, West Bengal.
• Formally established on 13 February 1890 under the direction of Sir George King to explore and catalog the plant wealth of the Indian subcontinent. (Correct answer: Option 3)

• Assertion (A) is True: Beer's Law ($I = I_0 e^{-\alpha c l}$) is valid only for homogeneous, non-interacting, molecularly dispersed absorbing media; when absorbing particles coagulate or flocculate into clumps, the linear relationship breaks down.
• Reason (R) is True: Flocculation concentrates absorbers into discrete clumps, creating large open inter-particle spaces where radiation passes without interaction ("sieve effect"), substantially reducing total light extinction.
• Relationship: Because particle coagulation creates open clear pathways for unattenuated radiation passage, Reason (R) provides the exact physical explanation for Assertion (A).
• Conclusion: Both (A) and (R) are true and (R) is the correct explanation of (A) (Option 1).

Correct option: (1) Both (A) and (R) are true and (R) is the correct explanation of (A)