There are thousands of different eubacteria or 'true bacteria'. T… - Vidyadip

Question

There are thousands of different eubacteria or 'true bacteria'. They are characterized by the presence of a rigid cell wall, and if motile, a flagellum. The cyanobacteria (also referred to as blue-green algae) have chlorophyll a similar to green plants and are photosynthetic autotrophs. The cyanobacteria are unicellular, colonial or filamentous, freshwater/marine or terrestrial algae. The colonies are generally surrounded by gelatinous sheath. They often form blooms in polluted water bodies. Some of these organisms can fix atmospheric nitrogen in specialized cells called heterocysts, e.g., Nostoc and Anabaena. 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.

(1) Which of the following can be termed as 'Photosynthetic Autotrophs'
(a) All monerans (b) Chemosynthetic Bacteria (c) Cyanobacteria (d) All Eubacteria

(2) Blue green algae are characterized by :
(a) They often form blooms in polluted water bodies.
(b) Some of these organisms can fix atmospheric nitrogen
(c) Their colonies are generally surrounded by gelatinous sheath.
(d) All of these

(3) Which is incorrect about Heterocysts:
(a) These are specialized cells
(b) These are present in all Cyanobacteria.
(c) Nostoc and Anabaena have Heterocysts.
(d) Organisms having these cells can fix atmospheric nitrogen

(4) Green plants are similar to Blue green algae in having:
(a) chlorophyll a (b) Heterocysts (c) chlorophyll b (d) None of these

(5) Which of these can be described as ‘true Bacteria’.
(a) Cyanobacteria only
(b) Only Chemosynthetic autotrophic bacteria
(c) Bacteria without cell wall.
(d) Eubacteria

✓

Answer

(1 - C), (2 - D), (3 - B), (4 - A), (5 - D)

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