Question 1 :
Select the correct options with respect to glycocalyx in bacterial cell
Question 12 :
Study the following statements and select the correct ones. <br/>(i) Methanogens are archaebacteria which produce methane in marshy areas. <br/>(ii)<i> Nostoc</i> is a filamentous blue green alga which fixes atmospheric nitrogen. <br/>(iii) Many members of the genus <i>Glomus</i> form mycorrhiza.
Question 14 :
Some hyperthermophilic organisms, that grow in highly acidic (pH = 2) habitats, belong to the two groups which are<br/>
Question 29 :
Of the following, the two bacterias used in genetic engineering are
Question 31 :
A bacterium is capable of withstanding extreme heat, dryness and toxic chemicals. This indicates that it is probably able to form
Question 33 :
Highly resistant thick walled spores produced by bacterial cells during unfavourable conditions are called as
Question 36 :
Read the following statements about four kinds of microorganisms P, Q, R, and S.(i) P converts milk into curd.<br/>(ii) Q is used for making antibiotics.<br/>(iii) R contains RNA as genetic material and causes the reduction in immunity of its host.<br/>(iv) S is used to manufacture wine and beer.<br/>Select the correct option.
Question 37 :
Assertion: All food chains will come to stand still if bacteria disappear from earth.
Reason: Bacteria are only associated with the soil fertility and hardly have any role in food chains.
Question 42 :
<i>Thermus aquaticus</i> is a species of bacteria found living in the hot springs in Yellowstone National Park. Hot springs typically are areas characterized by low oxygen levels, low light levels and high concentrations of sulfur and calcium carbonate.<br/>In what way do bacteria living in or near hot springs most likely make food?
Question 43 :
Spirochaete bacteria are exceptional in showing fast locomotion through thick mucus because of the presence of
Question 45 : Match the columns and choose the correct combination.<table class="wysiwyg-table"><tbody><tr><td></td><td>Column I</td><td></td><td>Column II</td></tr><tr><td>(a)</td><td><i>Escherichia coli</i></td><td>(i)</td><td>Nif gene</td></tr><tr><td>(b)</td><td><i>Rhizobium melitoti</i></td><td>(ii)</td><td>Digest hydrocarbons of crude oil</td></tr><tr><td>(c)</td><td><i>Bacillus thuringiensis</i></td><td>(iii)</td><td>Human insulin production</td></tr><tr><td>(d)</td><td><i>Pseudomonas putida</i></td><td>(iv)</td><td>Biocontrol of fungal disease</td></tr><tr><td></td><td></td><td>(v)</td><td>Biodegradable insecticide</td></tr></tbody></table>
Question 46 : Match column I and II and select the correct option. <br/><table class="table table-bordered"><tbody><tr><td> </td><td> List I</td><td> </td><td> List II</td></tr><tr><td> A</td><td> Aerobic</td><td> 1</td><td><i> Frankia</i></td></tr><tr><td> B</td><td>Non-photosynthetic bacteria<br/></td><td> 2</td><td><i> </i><i>Azospirillum</i></td></tr><tr><td> C</td><td><i> Casuarina</i></td><td> 3</td><td> <i>Clostridium</i></td></tr><tr><td> D</td><td> Tropical grasses</td><td> 4</td><td><i> Azotobacter</i></td></tr></tbody></table>
Question 47 :
Select the correct combination of statements (a-d) regarding the characteristics of certain organisms.<br/>(a) Methanogens are archaebacteria which produce methane in marshy areas.<br/>(b) Nostoc is a filamentous blue-green alga which fixes atmospheric nitrogen.<br/>(c) Chemosynthetic autotrophic bacteria synthesize cellulose from glucose.<br/>(d) Mycoplasma lacks a cell wall and can survive without oxygen.<br/>The correct statements are
Question 50 :
Read the following statements regarding methanogens and select the correct option<br/>i) They are included in the group Archaebacteria.<br/>ii) They are responsible for the production of biogas in gobar gas plants.<br/>iii) They live in hot sulphur springs.<br/>iv) They are strictly anaerobic.
Question 52 : Match the columns and find the correct answer<table class="wysiwyg-table"><tbody><tr><td></td><td>Column I</td><td></td><td>Column II</td></tr><tr><td>(a)</td><td><i>Streptomyces</i></td><td>(p)</td><td>Food poisoning</td></tr><tr><td>(b)</td><td><i>Rhizobium</i></td><td>(q)</td><td>Source of antibiotic</td></tr><tr><td>(c)</td><td><i>Nitrosomonas</i></td><td>(r)</td><td>Nitrogen fixation</td></tr><tr><td>(d)</td><td><i>Acetobacter</i></td><td>(s)</td><td>Nitrification</td></tr><tr><td></td><td></td><td>(t)</td><td>Vinegar synthesis</td></tr></tbody></table>
Question 53 :
Select the correct matches.<br/>(a) <i>Nitrosomonas</i> - nitrite to nitrate<br/>(b) <i>Thiobacillus </i>- denitrification<br/>(c) <i>Nostoc </i>- free-living nitrogen fixer<br/>(d) <i>Azotobacter </i>- anaerobic nitrogen fixer
Question 55 :
State whether the following statements are true or false.<br>Methanogens are among the most recently evolved monerans.
Question 59 :
Study the following lists.<br/>                List-I                                                        List-II<br/>(A) <i>Corynebacterium glutamicum </i>                     (I) Flexibility in shape<br/>(B) <i>Halobacterium   </i>                                           (II) Mineralisation<br/>(C) <i>Cristispira       </i>                                              (III) Lysine<br/>(D) <i>Bacillus mycoides</i>                                         (IV) Gas vacuoles<br/>                                                                             (V) Parasite on bacteria<br/>The correct match is
Question 69 :
An organism that shows sexual reproduction but lacks a proper nucleus in its cells. It can obtain nutrition in autotrophic as well as heterotrophic mode and posses a distinct cell wall is
Question 70 :
The factor which influences unicellular organisms to keep spherical shape is
