Q. No.| 1. | They are most abundant bacteria in nature |
| 2. | Many of them are important decomposers |
| 3. | They play a great role in recycling nutrients like nitrogen, phosphorus, iron and sulphur |
| 4. | They are helpful in making curd from milk, production of antibiotics, fixing nitrogen in legume roots, etc. |
In which kingdom would you classify the archaea and nitrogen-fixing organism, if the five-kingdom system of classification is used?
| 1. | Plantae | 2. | Fungi |
| 3. | Protista | 4. | Monera |
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Which is wrong about mycoplasma?
1. They are called PPLO
2. They are pleomorphic
3. They are sensitive to penicillin
4. They cause diseases in plants
Match the organisms in column I with habitats in column II.
| Column I | Column II | ||
| (a) | Halophiles | (i) | Hot springs |
| (b) | Thermoacidophiles | (ii) | Aquatic environment |
| (c) | Methanogens | (iii) | Guts of ruminants |
| (d) | Cyanobacteria | (iv) | Salty areas |
Select the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (iv) | (i) | (iii) | (ii) |
| 2. | (i) | (ii) | (iii) | (iv) |
| 3. | (iii) | (iv) | (i) | (ii) |
| 4. | (ii) | (iv) | (iii) | (i) |
Identify the incorrect statement regarding Eubacteria:
1. Cyanobacteria can fix atmospheric nitrogen in specialized cells called heterocysts
2. Chemosynthetic autotrophic bacteria play a great role in recycling nitrogen and phosphorus
3. Heterotrophic bacteria are the only bacteria that do not include any economically useful microbe for humans
4. Mycoplasma lack cell wall and can survive without oxygen
| Organism | Nature of cell wall | |
| 1. | True bacterium | Polysaccharide + Amino acid |
| 2. | Fungus | With chitin |
| 3. | Euglenoids | Cellulosic |
| 4. | Diatoms | Embedded with silica |
Bacteria that obtain energy from light and carbon from the fixation of carbon dioxide, using reducing equivalents from inorganic compounds are called as:
| 1. | chemolithoautotrophs | 2. | photolithoautotrophs |
| 3. | photoorganoheterotrophs | 4. | chemolithoheterotrophs |
Which one of the following statements is wrong?
1. Phycomycetes are also called algal fungi.
2. Cyanobacteria are also called blue-green algae.
3. Golden algae are also called desmids.
4. Eubacteria are also called false bacteria.
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What is common to Anabaena, Nostoc, Nitrosomonas and Nitrobacter?
I. All are photosynthetic autotrophs.
II. All can directly fix atmospheric nitrogen.
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
Archaebacteria differ from other bacteria in having a different cell wall structure. Which of the following is/are true?
I. No archaebacteria have peptidoglycan in their cell wall but some can have pseudopeptidoglycan.
II. No bacteria have S-layer in their cell envelopes but some may have slimy glycocalyx.
| 1. | Only I | 2. | Only II |
| 3. | Both I and II | 4. | Neither I nor II |
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