Question
Select the correct combination of the statements (A-D) regarding the characteristics of certain organisms: (A) Methanogens are archaebacteria which produce methane in marshy areas. (B) Nostoc is a filamentous blue–green algae which fixes atmospheric nitrogen. (C) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose. (D) Mycoplasma lack a cell wall and can survive without oxygen.
(a), (b) and (c)
(b), (c) and (d)
(a), (b) and (d)
(b) and (c)
, statement (A) is correct because methanogens are a type of archaebacteria that inhabit marshy areas and are responsible for methane production . Statement (B) is correct as Nostoc is identified as a filamentous cyanobacterium (blue-green algae) that fixes atmospheric nitrogen in specialised cells . Statement (D) is correct because Mycoplasma are unique organisms that completely lack a cell wall and possess the ability to survive without oxygen . Statement (C) is incorrect because chemosynthetic autotrophic bacteria obtain energy by oxidising various inorganic substances such as nitrates and ammonia to produce ATP, rather than synthesising cellulose from glucose . Therefore, the correct combination is (A), (B), and (D) .
This question aligns with the NEET BIOLOGY syllabus, specifically targeting concepts from Biological Classification . Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.
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