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 brifly ribosomes- endoplasmic reticulum , Explain brifly Ribosomes,...

Explain brifly Ribosomes, Endoplasmic Reticulum, Golgi Apparatus ? Ribosomes, Endoplasmic Reticulum, Golgi Apparatus :  The cytoplasm contains many ribosomes, which are sphe

Taxanomy of platyhelminthes, what is example of class,genus and species of ...

what is example of class,genus and species of platyhelminthes?

Precautions for spore staining in a given bacterial culture, Define some Pr...

Define some Precautions for spore staining in a given bacterial culture? 1. Do not allow malachite green to dry on slide. 2. Decolourization should be done only after coolin

Mutation theory, MUTATION THEORY (Hugo de Vries 1901) - New species ...

MUTATION THEORY (Hugo de Vries 1901) - New species are not formed by continuous variations but sudden appearance of variations i.e., mutation. Mutation are heritable and per

Vitamins and minerals requirement in diabetes, Q. Vitamins and minerals req...

Q. Vitamins and minerals requirement in diabetes? The recommendation of vitamins and minerals is the same as for general population. However, lower levels of magnesium are ass

Explain viruses and their classification, Explain Viruses and their classif...

Explain Viruses and their classification? Viruses are living organisms. Viruses are not living organisms. No, the above is not a misprint! In fact, viruses defy the normal c

What is cardiac catheterization, Q. What is Cardiac Catheterization? Ro...

Q. What is Cardiac Catheterization? Routine cardiac catheterization is not necessary in patients with mitral regurgitation. It may be done when there is discrepancy between cli

Calculate the ph - microbial survival and growth, Calculate the pH - microb...

Calculate the pH - microbial survival and growth? Presence of microorganisms also depends on the pH of the medium. Most bacteria grow optimally near neutral pH (optimum 6.5 - 7

Determine the representation of the nucleus, Determine the representation o...

Determine the representation of the Nucleus In all eukaryotic cells, the nucleus represents the most prominent and conspicuous organelle of the cell, and is generally seen as a

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