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How does light intensity control plant seed germination?

Plants contain a type of pigment called phytochrome, which are sensitive to light. Phytochrome exists in two forms: phytochrome red and phytochrome far-red. When sunlight (which contains red light) shines on...
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Answered by Daniella G. • Biology tutor
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Describe the events that take place in a neurone which produce an action potential

The action potential begins when the stimulus exceeds the threshold. - The voltage gated sodium ion channels open. - Sodium ions diffuse into the axon down an electrochemical gradient. - Positive feedback oc...
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Answered by Lauren G. • Biology tutor
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Calculating the hydrostatic force on a submerged body

The hydrostatic force is a force exerted by a fluid on a submerged body. This force comes from the weight of the fluid acting down on the submerged body, so it can be derived from the equation weight (in thi...
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Answered by Samuel H. • Physics tutor
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How do you calculate the pH of a weak acid?

Strong acids dissociate fully in solution. Examples of strong bases include HCl and H 2 SO4. Organic acids, such as methanoic acid or oxalic acid, as well as some inorganic acids such as hydrogen fluoride, a...
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Answered by Joe M. • Chemistry tutor
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How do I integrate by parts?

Lets use and example: y=x sin(x). If we try to integrate this normally, we find it very hard. The integration by parts method splits up the function we are integrating into manageable bits. The formula we us...
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Answered by Barnaby W. • Maths tutor
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