Solar tracking - nastic and epinastic responses, Biology

Assignment Help:

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.


Related Discussions:- Solar tracking - nastic and epinastic responses

Explain the primary and secondary air pollutants, Explain the Primary and S...

Explain the Primary and Secondary air Pollutants a. Primary pollutants -emitted directly  Particulate matter ( Sulfur dioxide (SO 2 ) Nitrogen dioxide (NO 2 )

Carditis, It has been shown by prospective studies that Rheumatic heart dis...

It has been shown by prospective studies that Rheumatic heart disease (RHD) is linked to the occurrence of carditis during the first episode of ARF. If the first episode is accompa

Colibacillosis of poultry, Colibacillosis of poultry Colibacillosis is...

Colibacillosis of poultry Colibacillosis is an important disease among poultry, especially among broiler chicks aged 6-9 weeks and less frequently of young chicks during first

Non-striated or smooth muscles, NONSTRIATED (= SMOOTH) MUSCLES - Non...

NONSTRIATED (= SMOOTH) MUSCLES - Non-striated muscles are found in the posterior part of oesophagus, stomach, intestine, lungs, urinogenital tract, urinary bladder, blood ve

Diseases of cardiovascular and haemopoietic system, D i s e a s e s ...

D i s e a s e s of Cardiovascular and Haemopoietic System Cardiovascular system maintains circulation of blood for normal exchange of fluid, electrolytes, oxygen and nut

Are nematodes exclusively parasites, Are nematodes exclusively parasites? ...

Are nematodes exclusively parasites? There are parasitic roundworms, containing parasites of plants, but there are also free-living nematodes.

Cytological approach, Write an essay on cytological approach in taxonomy.

Write an essay on cytological approach in taxonomy.

Does thermal inversion occur in the winter or in the summer, Q. Does therma...

Q. Does thermal inversion occur in the winter or in the summer? The Pollutant low altitude thermal inversion take place in the winter and in this period of the year the sun hea

Chitra valve-types of valves, Chitra Valve :  This valve was desi...

Chitra Valve :  This valve was designed and developed at Sri.Chitra Institute of Medical Sciences in Thiruvananthapuram and marketed by TTK Industries. It is a tilting di

Explain genetically modified organisms, Q. Explain Genetically Modified Org...

Q. Explain Genetically Modified Organisms? Techniques that use gene modification through (a) recombinant DNA technology and (b) cellular techniques of introducing DNA into an o

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd