Solar tracking - nastic and epinastic responses, Biology

Solar Tracking - Nastic and Epinastic Responses

Many plants such as sun flowers are capable of solar tracking in which the flat blade of leaves or inflorescence will remain at right angles to the sun throughout the day, maximizing the light harvested by the leaf. Darwin studied the phenomenon first. This movement is presently thought to be controlled through a mechanism of maintenance of turgidity levels in petiole (pulvinus). Later studies also indicate a role for active pumping of K' ions across the membrane.

2371_Solar Tracking.png

Figure: Solar tracking in a plant with cup-shaped leaves such as some members of the Mal- vacea family (e.g. Malva or Lavatera). The leaves receive directional signals from the sun and swivel around to face it as pulvinus cells at the base of the blade gain or lose water. (a and b) The leaves track the sun during the day, much as a radio telescope tracks a satellite (c) An hour or two after sunset, the blades arc nearly horizontal in the "relaxed" position they maintain during most of the night (d) About an hour before sunrise, the blades face the point on the eastern horizon where the sun came up the day before.

Posted Date: 1/24/2013 1:43:15 AM | Location : United States







Related Discussions:- Solar tracking - nastic and epinastic responses, Assignment Help, Ask Question on Solar tracking - nastic and epinastic responses, Get Answer, Expert's Help, Solar tracking - nastic and epinastic responses Discussions

Write discussion on Solar tracking - nastic and epinastic responses
Your posts are moderated
Related Questions
A number of protein-coding genes are active in all cells and are required for so- called house-keeping functions such as the enzymes of glycolysis, the citric acid cycle and the pr

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Why do protease-supplying cells of the stomach and of the pancreas make only precursors of the active proteolytic enzymes? The stomach and the pancreas make zymogens of the pro

DIFFERENCE BETWEEN OPEN SYSTEM AND CLOSED SYSTEM - S .No. C h arac t er O p en system C losed system

How can the abundance and diversity of living beings in the tropical forests be explained? The biodiversity of these ecosystems can be defined by the great availability of the

Explain sol -gel transformation During sol -gel transformation, a three dimensional network is formed by the interlocking of dispersed particles. The liquid phase is entrapped

Determine the importance of Educational History- assessment  A complete school history includes information regarding a child's current grade placement, any grade repetitions o

what is the structure of ecosystem

Is a peptide bond a covalent or a non-covalent bond? Please explain.

Explain Hazard identification Hazard identification   is "the  identification of biological, chemical and physical agents capable of causing adverse health effects and which m