Step 1: Understanding the Concept:
The question asks for the definition of "stream" as provided in the Water (Prevention and Control of Pollution) Act, 1974.
Step 2: Detailed Explanation:
Section 2(j) of the Water (Prevention and Control of Pollution) Act, 1974, defines the term "stream". The definition is inclusive:
"'stream' includes—
(i) river;
(ii) water course (whether flowing or for the time being dry);
(iii) inland water (whether natural or artificial);
(iv) sub-terranean waters;
(v) sea or tidal waters to such extent or, as the case may be, to such point as the State Government may, by notification in the Official Gazette, specify in this behalf;"
Based on the full text of the definition, a stream includes rivers, water courses, and also subterranean waters. Let's re-examine the options based on this legal definition.
(A) Incorrect.
(B) Incorrect.
(C) Incorrect, as it explicitly excludes subterranean waters, which are included in the legal definition.
(D) The OCR shows "subterranean river". The legal term is "subterranean waters". Assuming this is a typo for "subterranean waters", this option would be the most correct one, as it includes all three elements.
However, let's look at the options as written in the OCR for the AIBE XI exam. There might have been an error in the question paper itself or the provided answer key of that year. The case law M.C. Mehta v. Union of India (Ganga Pollution Case) discussed the broad scope of the term. Looking at the options again, (C) is a very specific statement. It is possible that for the purpose of this exam question, there was a focus on an older interpretation or a specific context where subterranean waters were treated differently, although this is contrary to the bare act's text. Let's reconsider the official AIBE XI answer key. The official key for Set B states the answer is (C). This is factually incorrect based on the plain text of Section 2(j) of the Act. The only way to justify (C) is if there was a specific amendment or judicial interpretation being tested, which is not commonly known, or if the question paper had a significant error. Given the likely context of an exam, and accepting the official (but flawed) answer, the logic would be to assume the question is intended to test surface waters only.
Let's proceed with the correct legal answer based on the Act:
The definition in Sec 2(j) includes rivers, water courses, and subterranean waters. Therefore, none of the options A, B, or C are fully correct as they make incorrect exclusions. Option D is the closest if we read "subterranean river" as "subterranean waters". Given the flawed nature, if we MUST choose, D is the best fit. But if we must align with a potentially flawed official key that points to C, the reasoning is weak.
Let's assume there is an error in the OCR and option C was "Includes river and water course, and subterranean waters". But as it stands, let's stick to the text.
The Act includes subterranean waters. Option (C) excludes them. Therefore, option (C) is definitively wrong. Option (D) includes them (as subterranean river). This is the most plausible choice.
There seems to be a discrepancy between the provided options and the actual law. Assuming the provided solution key for the exam chose (C), it is incorrect as per the bare act. For the purpose of providing a correct solution, let's highlight the error.
Correction based on the Bare Act:
The definition in Section 2(j) of the Water Act, 1974 clearly includes subterranean waters. Therefore, option (C) which states "...but not subterranean waters" is legally incorrect. The most accurate option, despite the potential typo, would be (D).
Justification if Answer is (C):
There is no clear legal justification for (C). It directly contradicts the text of the law. An exam maker might have made a mistake.
Step 3: Final Answer:
Based on a literal reading of Section 2(j) of the Water Act, 1974, the definition of 'stream' includes rivers, water courses, and subterranean waters. Therefore, the provided options are flawed. The closest correct option would be (D), assuming 'subterranean river' means 'subterranean waters'. The stated answer (C) in many answer keys is legally incorrect.