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Question
In a given paddy field, farmers reported over 50% higher yields of rice. This is most probably the outcome of using which of the following biofertilizers?
In a given paddy field, farmers reported over 50% higher yields of rice. This is most probably the outcome of using which of the following biofertilizers?
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Solution
The correct option is C Azolla pinnata
Azolla pinnata is a small, free floating, freshwater fern which is found in association with rice plants. It doesn’t interfere in their growth. Azolla is found in association with the cyanobacteria Anabaena, and together this Azolla-Anabaena association is used to increase the productivity of rice crops.
With the help of Azolla-Anabaena, rice can be grown year after year, several crops a year, with little or no decline in productivity; hence no rotation of crops is necessary. Hence, option d is correct.
Rhizobium bacteria is found in the nodules on the roots of leguminous plants. They form a symbiotic association with the plant. Rice is not a leguminous plant, hence Rhizobium association with rice is not found. Hence, option b is incorrect.
Azospirillum lives around the roots of higher plants without developing an intimate connection with them. So, it is a free living bacteria, but is not used in rice cultivation. Hence, option a is incorrect.
Mycorrhiza is a mutually beneficial or symbiotic association of a fungus with the root of a higher plant. Hence, option c is incorrect.
Azolla pinnata is a small, free floating, freshwater fern which is found in association with rice plants. It doesn’t interfere in their growth. Azolla is found in association with the cyanobacteria Anabaena, and together this Azolla-Anabaena association is used to increase the productivity of rice crops.
With the help of Azolla-Anabaena, rice can be grown year after year, several crops a year, with little or no decline in productivity; hence no rotation of crops is necessary. Hence, option d is correct.
Rhizobium bacteria is found in the nodules on the roots of leguminous plants. They form a symbiotic association with the plant. Rice is not a leguminous plant, hence Rhizobium association with rice is not found. Hence, option b is incorrect.
Azospirillum lives around the roots of higher plants without developing an intimate connection with them. So, it is a free living bacteria, but is not used in rice cultivation. Hence, option a is incorrect.
Mycorrhiza is a mutually beneficial or symbiotic association of a fungus with the root of a higher plant. Hence, option c is incorrect.
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