On 9/23/15, the day and the nightwill be of exactly equal length as wemark the f

Question

On 9/23/15, the day and the nightwill be of exactly equal length as wemark the first day of autumn. This“equinox” will happen again on thefirst day of spring. Plants (andanimals) clearly distinguishbetween these two equinoxes.

Use the web to explain how plantsuse the pattern of changes inday/night to solve the paradox thatday-length and night-length areequal twice a year.

Here you will show that you understand how circadian timing relates to seasonal timing.First, demonstrate your capacity extend circadian thinking to plants. View and read     < http://www.nature.com/news/video-sunflowers-move-to-internal-rhythm-1.15548  >and then summarize what you have learned. Be sure to discuss these terms: circadian, free-running, directional cues, and growth patterns.Choose any plant to use as your example for seasonal rhythms, e.g., flowering. Describe apossible mechanism that relies on day/night information to determines its pattern of chemicalsignaling – what is the biochemical result of changes in light patterns? Finally, explain howthese organisms are programmed toward the right “plan of action” for the appropriate time ofthe year.

Explanation / Answer

For a short period of time days and nights around the world each last close to 12 hours. Then as the earth continues its path around the sun days become shorter and nights lengthen

For isntances during long winter days the siberian hamster testes increase to almost 17 times their size during short days.

The earth axis is tilted at 23.5 degree which makes the northen hemishpheres point more directly at the sun. As for why the begining of falls on a different dah each year there are two reason.

Light receptors in the retina of the eyes rods ,cones and a third type called intinsically photosenstivity retinal ganglion cells.

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