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Select the correct combination of the statements (i-iv) regarding the characteristics of certain organisms.
(i) Methanogens are archaebacteria which produce methane in marshy areas.
(ii) Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen.
(iii) Chemosynthetic autotrophic bacteria synthesise cellulose from glucose.
(iv) Mycoplasma lack a cell wall and can survive without oxygen.
- a)Only (ii) and (iii)
- b)Only (i), (ii) and (iv)
- c)Only (i),(ii) and (iii)
- d)Only (ii), (iii) and (iv)
Correct answer is option 'B'. Can you explain this answer?
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Select the correct combination of the statements (i-iv) regarding the ...
Chemosynthetic autotrophic bacteria oxidise various inorganic substances such as nitrates, nitrites and ammonia and use the released energy for their ATP production. They play a great role in recycling nutrients like nitrogen, phosphorous, iron and sulphur.
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Select the correct combination of the statements (i-iv) regarding the ...
Characteristics of Organisms
In evaluating the statements about various organisms, only a specific combination holds true. Let's analyze each statement to understand why option 'b' (Only (i), (ii), and (iv)) is the correct choice.
Analysis of the Statements
- (i) Methanogens are archaebacteria which produce methane in marshy areas.
- This statement is true. Methanogens are a group of archaebacteria that thrive in anaerobic (oxygen-free) environments like marshes and swamps, where they produce methane as a byproduct of their metabolic processes.
- (ii) Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen.
- This statement is true. Nostoc is a cyanobacterium (commonly referred to as blue-green algae) that forms filamentous colonies and has specialized cells called heterocysts for nitrogen fixation, converting atmospheric nitrogen into a usable form for plants.
- (iii) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
- This statement is false. Chemosynthetic bacteria utilize inorganic compounds to produce organic molecules, but they do not synthesize cellulose from glucose. Cellulose is primarily produced by plants and some algae.
- (iv) Mycoplasma lack a cell wall and can survive without oxygen.
- This statement is true. Mycoplasmas are unique among bacteria because they do not possess a cell wall, allowing them to adapt to various environments, including anaerobic conditions.
Conclusion
Based on the analysis, the correct statements are (i), (ii), and (iv). Therefore, the answer is option 'b': Only (i), (ii), and (iv). Statement (iii) is inaccurate, as it misrepresents the metabolic capabilities of chemosynthetic bacteria.
In evaluating the statements about various organisms, only a specific combination holds true. Let's analyze each statement to understand why option 'b' (Only (i), (ii), and (iv)) is the correct choice.
Analysis of the Statements
- (i) Methanogens are archaebacteria which produce methane in marshy areas.
- This statement is true. Methanogens are a group of archaebacteria that thrive in anaerobic (oxygen-free) environments like marshes and swamps, where they produce methane as a byproduct of their metabolic processes.
- (ii) Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen.
- This statement is true. Nostoc is a cyanobacterium (commonly referred to as blue-green algae) that forms filamentous colonies and has specialized cells called heterocysts for nitrogen fixation, converting atmospheric nitrogen into a usable form for plants.
- (iii) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.
- This statement is false. Chemosynthetic bacteria utilize inorganic compounds to produce organic molecules, but they do not synthesize cellulose from glucose. Cellulose is primarily produced by plants and some algae.
- (iv) Mycoplasma lack a cell wall and can survive without oxygen.
- This statement is true. Mycoplasmas are unique among bacteria because they do not possess a cell wall, allowing them to adapt to various environments, including anaerobic conditions.
Conclusion
Based on the analysis, the correct statements are (i), (ii), and (iv). Therefore, the answer is option 'b': Only (i), (ii), and (iv). Statement (iii) is inaccurate, as it misrepresents the metabolic capabilities of chemosynthetic bacteria.
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Select the correct combination of the statements (i-iv) regarding the characteristics of certain organisms.(i) Methanogens are archaebacteria which produce methane in marshy areas.(ii)Nostocis a filamentous blue-green alga which fixes atmospheric nitrogen.(iii) Chemosynthetic autotrophic bacteria synthesise cellulose from glucose.(iv)Mycoplasmalack a cell wall and can survive without oxygen.a)Only (ii) and (iii)b)Only (i), (ii) and (iv)c)Only (i),(ii) and (iii)d)Only (ii), (iii) and (iv)Correct answer is option 'B'. Can you explain this answer?
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Select the correct combination of the statements (i-iv) regarding the characteristics of certain organisms.(i) Methanogens are archaebacteria which produce methane in marshy areas.(ii)Nostocis a filamentous blue-green alga which fixes atmospheric nitrogen.(iii) Chemosynthetic autotrophic bacteria synthesise cellulose from glucose.(iv)Mycoplasmalack a cell wall and can survive without oxygen.a)Only (ii) and (iii)b)Only (i), (ii) and (iv)c)Only (i),(ii) and (iii)d)Only (ii), (iii) and (iv)Correct answer is option 'B'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Select the correct combination of the statements (i-iv) regarding the characteristics of certain organisms.(i) Methanogens are archaebacteria which produce methane in marshy areas.(ii)Nostocis a filamentous blue-green alga which fixes atmospheric nitrogen.(iii) Chemosynthetic autotrophic bacteria synthesise cellulose from glucose.(iv)Mycoplasmalack a cell wall and can survive without oxygen.a)Only (ii) and (iii)b)Only (i), (ii) and (iv)c)Only (i),(ii) and (iii)d)Only (ii), (iii) and (iv)Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Select the correct combination of the statements (i-iv) regarding the characteristics of certain organisms.(i) Methanogens are archaebacteria which produce methane in marshy areas.(ii)Nostocis a filamentous blue-green alga which fixes atmospheric nitrogen.(iii) Chemosynthetic autotrophic bacteria synthesise cellulose from glucose.(iv)Mycoplasmalack a cell wall and can survive without oxygen.a)Only (ii) and (iii)b)Only (i), (ii) and (iv)c)Only (i),(ii) and (iii)d)Only (ii), (iii) and (iv)Correct answer is option 'B'. Can you explain this answer?.
Solutions for Select the correct combination of the statements (i-iv) regarding the characteristics of certain organisms.(i) Methanogens are archaebacteria which produce methane in marshy areas.(ii)Nostocis a filamentous blue-green alga which fixes atmospheric nitrogen.(iii) Chemosynthetic autotrophic bacteria synthesise cellulose from glucose.(iv)Mycoplasmalack a cell wall and can survive without oxygen.a)Only (ii) and (iii)b)Only (i), (ii) and (iv)c)Only (i),(ii) and (iii)d)Only (ii), (iii) and (iv)Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for NEET.
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ample number of questions to practice Select the correct combination of the statements (i-iv) regarding the characteristics of certain organisms.(i) Methanogens are archaebacteria which produce methane in marshy areas.(ii)Nostocis a filamentous blue-green alga which fixes atmospheric nitrogen.(iii) Chemosynthetic autotrophic bacteria synthesise cellulose from glucose.(iv)Mycoplasmalack a cell wall and can survive without oxygen.a)Only (ii) and (iii)b)Only (i), (ii) and (iv)c)Only (i),(ii) and (iii)d)Only (ii), (iii) and (iv)Correct answer is option 'B'. Can you explain this answer? tests, examples and also practice NEET tests.
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