Before Plowing a Field,a Farmer Thought the Bare Field Looked

question 29

Multiple Choice

Before plowing a field,a farmer thought the bare field looked weed-free.Three days after plowing and turning over the soil,he was amazed to see thousands of tiny seedlings.What is the most likely reason for the mass germination of seeds?

• A)large seeds that needed soil disturbance in order to germinate
• B)small seeds that need light in order to germinate
• C)small seeds that were scarified by exposure to plow
• D)large seeds that needed exposure to higher levels of oxygen in order to germinate

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Definitions:

Resting Potential

The difference in electric charge across the neuronal membrane when the neuron is not actively sending a signal, crucial for the initiation of nerve impulses.

Excitatory Postsynaptic Potential

A temporary increase in postsynaptic membrane potential due to the flow of positively charged ions into the postsynaptic cell, making it more likely to fire an action potential.

Action Potential

A momentary change in electrical potential on the surface of a neuron or muscle cell, allowing the transmission of signals.

Repolarization

A phase in the cardiac cycle or neural activity where the cell membrane returns to its resting potential after depolarization.