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
Describe the difference between dna and protein. (structural unit, linkage bond, primary and spatial structure)

Aesthetic and Recreational Significance - Wildlife Many wild species are a source of beauty, wonder; joy, and recreational pleasure for large number of people. Observing leave

Q. Explain Thalamus and Hypothalamus ? Thalamus and Hypothalamus: The thalamus is situated in the forebrain at the uppermost part of the diencephalon (posterior part of the for

Prophylaxis Medical Letter consultants generally do not prescribe antibiotic prophylaxis for travelers' diarrhea, but rather instruct thec patient to begin self-treatment when

Mycotic diseases Mycotic (fungal) diseases of animals and birds are of considerable importance both from public health and economic point of view. The fungi responsible for an

How did the experiments of Redi and Pasteur refute the hypothesis of spontaneous generation? To refute the impulsive generation hypothesis many experiments were performed. The

A horticulturist keeps Chrysanthemum plants in short-day conditions during long-day season. State its effect on flowering. Specify the role of phytochrome included. Explain glom

Q. What are the Keys for Identifying plants and animals? Keys are determined as devices to help in identifying plants and animals. These are merely an aid to identification bas

Describe the Stages of Atherosclerosis ? The process of atherosclerosis which gives rise to CAD marches in stages. The earliest recognizable pathologic lesions are the fatty st

Q. Write the meaning of Gestational Diabetes Mellitus? Gestational Diabetes Mellitus (GDM) is defined as glucose intolerance of any severity that has its onset or is first reco