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251.

In unfavourable adverse conditions bacteria produce resting spores calledA. exosporesB. chlamydosporesC. microsporesD. endospores

Answer» Correct Answer - D
Discussion
252.

Why the food can be kept for a longer time in cold house than in normal conditionsA. Insert can not enterB. Bacterial multiplication stopsC. Bacterial multiplication is reducedD. There is plasmolysis at low temperature

Answer» Correct Answer - c
Discussion
253.

Lysozyme that is present in perspiration, saliva and tears, destroysA. Certain fungiB. Certain types of becteriaC. All virusesD. Most virus-infected cells

Answer» Correct Answer - b
Lysozyme is a enzyme which can dissolve the cell wall of bacteria.
Discussion
254.

Transformation experiments using Pneumococcus bacteria led to the hypothesis thatA. DNA is the genetic materialB. Bacteria have sexula reproductionC. Chromosomes are made up of DNAD. RNA is the transfer link

Answer» Correct Answer - a
Discussion
255.

Atmospheric nitrogen-fixation is carried on byA. FunariaB. AnabaenaC. ChlamydomonasD. Fern gametophyte

Answer» Correct Answer - b
Discussion
256.

which does not help in `N_(2)` fixationA. AnabaenaB. NostocC. OscillatoriaD. Rhizobium

Answer» Correct Answer - c
They lack heterocyst. That is why, they can not take part in `N_(2)` fixation.
Discussion
257.

An example of symbiotic bacterium isA. NitrosomonasB. NitrobacterC. ClostridiumD. Rhizobium

Answer» Correct Answer - D
Discussion
258.

Which bacteria convert ammonium salts into nitriteA. NitrobacterB. NitrosomonasC. AzotobacterD. None of these

Answer» Correct Answer - b
`NH_(4) overset("Nitrosomonas")(rarr)NO_(2) overset("Nitrobacter")(rarr)NO_(3)`
Discussion
259.

Which of the following is non-symbiotic biofertilizerA. VAMB. AzotobacterC. AnabaenaD. Rhizobium

Answer» Correct Answer - b
Non-symbiotic bacteria are also called free-living nitrogen fixing bacteria e.g. Azotobacter. They are agriculturally important.
Discussion
260.

All bacteria have the following organelleA. mesosomesB. Golgi bodiesC. mitochondriaD. chloroplast

Answer» Correct Answer - A
Discussion
261.

Among the statements given below find out which statement (s) is/are incorrect about Gram bacteria and select the appropriate code. I. The techinique of Gram staining was introduced by Hans Christian Gram in 1874. II. The basal body of flagellum of Gram positive bacteria has four rings of swellings. III. The lipid content in Gram positive bacteria cell wall is very low. IV. Escherichia coli and Salmonella are Gam negative bacteria.A. I, III and IVB. I and IIC. Only IIID. III and IV

Answer» Correct Answer - B
Discussion
262.

What is incorrect for mycoplasmaA. They are osmotically inactiveB. They show absence of cell wallC. They are sensitive to modern antibioticsD. They are obligate intracellular parasites

Answer» Correct Answer - D
Discussion
263.

Which one of the following statements is incorrect?A. Golden algae are also called desmidsB. Eubacteria are also called false bacteriaC. Phycomycetes are also called algal fungiD. Cyanobacteria are also called blue-green algae

Answer» Correct Answer - B
Discussion
264.

Match the following Columns. A. `{:(A,B,C,D,E),(5,3,4,2,1):}`B. `{:(A,B,C,D,E),(1,2,3,4,5):}`C. `{:(A,B,C,D,E),(4,2,1,3,5):}`D. `{:(A,B,C,D,E),(5,4,3,2,1):}`

Answer» Correct Answer - A
Discussion
265.

Match the following Columns. A. `{:(A,B,C,D,E),(2,3,4,5,1):}`B. `{:(A,B,C,D,E),(1,2,3,4,5):}`C. `{:(A,B,C,D,E),(5,4,3,2,1):}`D. `{:(A,B,C,D,E),(4,1,2,3,5):}`

Answer» Correct Answer - A
Discussion
266.

Match the following Columns. A. `{:(A,B,C,D),(4,3,2,1):}`B. `{:(A,B,C,D),(1,2,3,4):}`C. `{:(A,B,C,D),(3,4,1,2):}`D. `{:(A,B,C,D),(2,1,4,3):}`

Answer» Correct Answer - B
Discussion
267.

Match the following Columns. A. `{:(A,B,C,D),(3,1,4,2):}`B. `{:(A,B,C,D),(5,4,2,3):}`C. `{:(A,B,C,D),(5,3,2,1):}`D. `{:(A,B,C,D),(2,4,5,3):}`

Answer» Correct Answer - B
Discussion