Q. No.The vast majority of bacteria are:
| 1. Heterotrophs | 2. Photoautotrophs |
| 3. Chemosynthetic autotrophs | 4. Methanotrophs |
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Match the bacteria in Column I with its shape in Column II and select the correct option from the codes given below:
|
COLUMN I |
|
COLUMN II |
|
|
A |
Bacillus |
a |
Rod |
|
B |
Coccus |
b |
Spherical |
|
C |
Spirilla |
c |
Spiral |
|
D |
Vibrio |
d |
Comma |
Codes
| A | B | C | D | |
| 1. | a | b | c | d |
| 2. | b | a | c | d |
| 3. | a | d | c | b |
| 4. | b | a | d | c |
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Bacteria are of varied shapes. Identify the correct match for A, B and C in the given figure:
| A | B | C | |
| 1. | Spirocheate | Streptobacillus | Staphylococcus |
| 2. | Vibrios | Staphylobacillus | Streptococcus |
| 3. | Vibrios | Streptobacillus | Staphylococcus |
| 4. | Spirochaete | Staphylobacillus | Streptococcus |
Methanogens are commonly present in:
1. Alimentary canal of the lower invertebrates
2. Symbiotic relationships with xerophytic plants
3. Gut of ruminant animals
4. Close associations with corals
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Halophiles are archaebacteria adapted to extreme:
| 1. | Hot habitats | 2. | Saline habitats |
| 3. | Marshy habitats | 4. | Cold habitats |
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Both Archaebacteria and Eubacteria:
I. have a similar structure of cell wall
II. are members of Kingdom Monera
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Cyanobacteria:
| I: | are eubacteria |
| II: | have chlorophyll a similar to green plants |
| III: | can fix atmospheric nitrogen |
1. Only III is correct
2. Only I and II are correct
3. Only II and III are correct
4. I, II and III are correct
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Cyanobacteria:
I. are also referred to as ‘blue green algae’.
II. are photosynthetic autotrophs with chlorophyll a similar to green plants.
III. often form blooms in polluted water bodies.
IV. some of them can fix atmospheric nitrogen in specialised cells called hetrocysts.
In light of the above given statements:
| Only I, II and IV are correct | Only I, II and III are correct |
| All statements are correct | Only I and III are correct |
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Which of the following plant diseases in not caused by a fungus?
1. Late blight of potato
2. Loose smut of wheat
3. Canker in citrus
4. Powdery mildew of grape vine
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Identify the incorrect statement regarding true bacteria?
| 1. | As a group, they exhibit maximum metabolic diversity. |
| 2. | Chemosynthetic autotrophic bacteria play a great role in recycling nutrients like nitrogen, phosphorous, iron and sulphur. |
| 3. | Heterotrophic bacteria are the most abundant in nature. |
| 4. | Bacteria reproduce mainly by fission but sometimes under favourable conditions, they produce spores. |
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