Question 2 :
Some hyperthermophilic organisms, that grow in highly&#160;acidic (pH = 2) habitats, belong to the two groups which are<br/>

Question 7 :
Select the correct options with respect to glycocalyx in bacterial cell

Question 13 :
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 23 :
A bacterium has a generation time of $50$ minutes. A culture containing $10^8$ cells mL is incubated for $300$ minutes. What will be the number of cells after $300$ minutes?

Question 27 :
Which one of the following cocci appear as bunch of grapes under microscope

Question 33 :
Which of the following contains prokaryote organisms capable of surviving in extreme conditions of heat and salt concentration?

Question 34 :
<i>Escherichia coli</i> is used extensively in biological research as it is

Question 38 :
If organisms on the earth start dying, which group of organisms will be the last to die?

Question 43 :
Highly resistant thick walled spores produced by bacterial cells during unfavourable conditions are called as

Question 44 :
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 45 :
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 47 :
Thin thread like bacteria, which apsears like fungal hyphae are known as