Question
Humus and the smallest particles of rock form in which
horizonSolution
Humus and the smallest particles of rock from the upper layer of soil called topsoil or A-horizon. ·        It is the layer containing the most nutrients for plants. ·        The roots of most plants are confined to this layer. ·        Humus makes this layer porous and fertile.
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- A series is given with one term missing. Choose the correct alternatives from the given ones that will complete the series.
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RGV, UME, ?, AYW, DEF
