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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.
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.
Senescence - Effects of Plant Growth Regulators on Development All five major growth regulator groups: auxins, gibberellins cytokinins, abscisic acid and ethylene can influenc
Vitamin a deficiency leads to a variety of disorders of the eyes and this effects the vision. Some of the disorders due to vitamin A deficiency are given below. 1) Night Blindne
Q. What we need Undergloves? These are a cotton glove worn under the treatment glove for those operators experiencing discomfort to the skin on the hands. These must be replace
is paper broken down by microorganisms
GIVE ADETAILED ACCOUNT OF THE VARIETY OF FUNCTIONS PERFORMED BY THE LIVER
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Explain in brief about Polymers In comparison to metals and ceramics, polymers are weak and flexible. These are not popular as dental implant materials. Examples of polymeric m
Environmental impact assessment consists of 4 phases which are as follows: (i) Organizing the job. (ii) Performing the assessment. (iii) Writing the environmental impac
List specific reasons why the inflammatory response is considered a body defense mechanism.
Hydrops amnii (Hydramnios) Hydramnios is a rare condition. Excessive accumulation of amniotic fluid can be the result of foetal dysgenesis and agenesis. The increase of amniot
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