Which of the following statements is correct?

  • A
    It is impossible to grow maize today without chemical fertilizers.
  • B
    Excessive use of chemical fertilizers leads to eutrophication in nearby water bodies.
  • C
    Both Azotobacter and Rhizobium fix atmospheric nitrogen in the root nodules of plants.
  • D
    Blue-green algae like Anabaena and Nostoc are important organisms that mobilize phosphate and potassium for plant nutrition in the soil.

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$A$ bucket filled with water is tied to a rope of length $0.5 ~m$ and is rotated in a circular path in a vertical plane. The minimum velocity it should have at the lowest point of the circle so that the water does not spill is,$(g = 10 ~m/s^2)$.

It includes multicellular,aquatic or terrestrial,photosynthetic eukaryotic organisms.

Which of the following monosaccharides is a pentose?

The incorrect statement regarding the following reactions is:
$XeF_6 + \text{Excess } H_2O \rightarrow 'X' + HF$
$XeF_6 + 2 H_2O \rightarrow 'Y' + HF$

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