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
Tlie phylum Cnidaria or Coelenterata, includes the faliiiliar hydras, jelly fishes, sea anemones and corals. You have olreacly studied about Cnidarialis in Units 4 and 7 of LSE-09

Photosynthetic function Structural organisation of the leaf is suitable to perform the process of photosynthesis. Hence leaf is called as a food factory. The leaf has a l

Q. Explain about Treatment and Management of Dyslipidemia? Maintenance of blood lipids within the normal range is the most essential objective to prevent the onset/progression

HOW ARE THE ORIGIN AND EVOLUTION OF ALGAE..

Gastrointestinal Tract - Changes Associated with ageing? Many path physiological factors limit the adequacy of the dietary intake of elderly. Loss of natural dentition may occu

Floriculture: This is the cultivation and development of commercially important floral plants like rose, lilies, etc. Floriculture is called flower farming is a discipline of hort

type of nutrition in platypus and ant eater

What do you mean by branchial basket? In ascidian adults the pharynx is enlarged to form branchial basket. Pharyngeal openings in wall of the basket allow water to pass through

Morphology:  It deals with external forms, structure and the relative position of various organs of living beings. Morphology is a branch of bioscience which dealing with the study

Define the Nutritional shortcomings among the elderly? Nutritional shortcomings are common among the elderly; most often due to poor choice of foods i.e. they may be consuming