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Standard XII
Biology
Microbes in Agriculture
Which of the ...
Question

Which of the following are correctly matched?


a.Kingdom Monera-Bacteria, Cyanobacteria and archaebacteria
b.Chemosynthetic organisms-N2 fixing, ammonifying and denitrifying bacteria
c.Insectivorous-Nepenthes, plants Utricularia and Dionea
d.Holozoic nutrition-Animals

A
a and b
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B
a, b, c
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C
b and c
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D
All of the above
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Solution

The correct option is D All of the above
The organisms which are placed in the kingdom Monera are prokaryotes. They are further classified into bacteria, cyanobacteria and archaebacteria.
Chemosynthetic organisms are the organisms which prepare their own food from organic or inorganic compounds. The nitrogen fixing bacteria, ammonifying bacteria and denitrifying bacteria perform chemosynthesis in order to obtain energy.
Insectivorous plants are the plants which consume insects. Nepenthes, Utricularia and Dionea are the examples of insectivorous plants.
Holozoic nutrition is a method of nutrition in which the food is ingested, digested and assimilated. The animals have holozoic mode of nutrition.
Thus, the correct answer is option D.

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Refer the given passage and answer the following questions

At present, the primary nutrient which limits the agricultural yield is nitrogen (N). Some plants are capable to produce moreN2 than they consume. These plants show a symbiotic relationship with N2-fixing bacteria such as Rhizobium. These bacteria produce root nodules in leguminous plants and convert atmospheric N2 into nitrogenous compounds. Rhizobium bacteria are gram-negative bacteria, which show host specificity and fix N2 in the presence of a red pigment called leghaemoglobin. It protects nitrogen-fixing enzyme nitrogenase from oxygen.

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Statement 1: Rhizobium bacteria can also live freely in the soil and carry out N2-fixation by themselves.
Statement 2: Such Rhizobium bacteria are called free-living N2-fixing bacteria.

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