Test Index

WAEC Agriculture 2022 Paper

Question : 16

Total: 47

Solution:

Concept:

In mechanical soil analysis, each labelled layer or sieve retains soil particles within a specific size range.

Explanation:

The part labelled II corresponds to the fine sand fraction in the soil sample.

Fine sand has diameters between

0.02\text{ mm}

and

0.2\text{ mm}

Particles larger than

0.2\text{ mm}

, such as coarse sand, are retained above this part.

Particles smaller than

0.02\text{ mm}

, such as silt and clay, pass through or settle below it.

The other soil particle classes are:

Gravel: above

2.0\text{ mm}

Coarse sand:

0.2\text{ mm}

2.0\text{ mm}

Fine sand:

0.02\text{ mm}

0.2\text{ mm}

Silt:

0.002\text{ mm}

0.02\text{ mm}

Clay: less than

0.002\text{ mm}

Therefore, the particles retained in part labelled II are fine sand.

Answer:

0.02\text{ mm} - 0.2\text{ mm}

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