Question
Write a note on nitrogen fixation?

Answer

Nitrogen fixation is the process of fixing free nitrogen into compounds.
This takes place by the following means:
  • Certain blue-green algae and bacteria can fix atmospheric nitrogen.
  • Nitrogen fixing bacteria found in the nodules of roots of legumes such as gram, bean, pulses etc. fix atmospheric nitrogen into nitrogen containing compounds.
  • Lightning also helps in the formation of nitrogen containing compounds.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Derive the relation between commercial unit of energy $(kWh)$ and $SI$ unit of energy (joule).
A body is moving uniformly in a straight line with a velocity of $5\ m/s$. Find graphically the distance covered by it in $5$ seconds.
What are the various forms of energy?
  1. Label $X$ and $Y.$
  2. What is the function of $X?$
  3. What is the composition of $Y?$
  4. Identify the above diagram and what is its common name?
Why does the skin of your finger shrink when you wash clothes for a long time?
The scientists now say that there are actually five states of matter $A, B, C, D$ and $E.$ The state $A$ has a fixed volume but no fixed shape. The state $B$ can be compressed very easily by applying pressure and state $C$ has a fixed shape as well as a fixed volume. The state $D$ is mixture of free electrons and ions whereas state $E$ is named after an Indian scientist and a famous physicist.
  1. Name the physical states $(i) A (ii) B (iii) C (iv) D$, and $(v) E.$
  2. Name one substance belonging to state $C$ which can directly change into vapours on heating. What is this process known as?
  3. Name one substance which normally belongs to state $B$ but whose solid form changes directly into gaseous state.
  4. Name the most common substance belonging to state $A.$
  5. Which state of matter makes the sum and other stars to glow.
A solution contains 50mL of alcohol mixed with $150\ mL$ of water. Calculate the concentration of this solution.
The melting point of ice is $273.16\ K$. What does this mean? Explain in detail.
Define soil erosion? Describe causes of soil erosion.
How is nitrogen replenished in atmosphere?