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Earn 100

Read the following statements and select the correct options that are true for cyanobacteria:
(a) The colonies are generally surrounded by a gelatinous sheath.
(b) They form blooms in polluted water bodies.
(c) They show nitrogenase activity in heterocyst.
(d) They perform oxygenic photosynthesis in a vegetative cell only.
(a) (a) only
(b)(a), (b) and (c) only
(c)(b) and (c) only
(d)(a), (b), (c) and (d)

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Important Questions on Biological Classification
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Which of the following is incorrect w.r.t. Archaebacteria?

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Clostridium botulinum is

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All the given characters are correct for Mycoplasma, except:

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What is incorrect for Nostoc?

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Archaebacterium shows similarity with Cyanobacteria in having

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Bacterial endospores are

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Consider the given figure and find out the correct option:

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How many statements are correct for the given organism in figure?
(i) Filamentous cyanobacteria as oxygenic photoautotroph.
(ii) Surrounded by mucilaginous sheath.
(iii) Heterocyst are specialized for N2 fixation.
(iv) Reproduce by hormogonia formation.
