The graph shows how the yield of a wheat crop varies with the addition of different amounts of nitrate fertiliser.
What can be concluded from the graph?
1 )
Nitrates help the formation of chlorophyll in wheat leaves.
2 )
The yield of wheat is proportional to the amount of nitrate fertiliser added.
3 )
Nitrate is needed for the formation of proteins.
Nitrates are required for healthy plants, but excess nitrates may inhibit growth.
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