A Study of the Effects of a Chemical Additive on Soil

question 73

Multiple Choice

A study of the effects of a chemical additive on soil acidity recorded the acidity of eight plots of land before and after the application of the additive. The results were:

$\begin{array}{|l|l|l|l|l|l|l|l|l|}\hline \text { Plot } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 \\\hline \text { Before } & 10 & 8 & 9 & 7 & 8 & 6 & 9 & 11 \\\hline \text { After } & 8 & 7 & 7 & 8 & 6 & 6 & 8 & 8 \\\hline & & & & & & & & \\\hline\end{array}$


The test value for the signed-rank test is:

• A) 1
• B) 2
• C) 3
• D) 4

Discuss the importance and function of the sodium-potassium pump in maintaining ion concentration gradients across the neuron's membrane.

Identify the phases of an action potential and factors affecting action potential propagation speed, including myelination.

Explain the mechanisms and significance of the absolute and relative refractory periods in action potential generation.

Describe the process of synaptic transmission, including the role of neurotransmitters and the sequence of events from neurotransmitter release to response in the postsynaptic cell.

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