Nastic and epinastic responses, Biology

Nastic and Epinastic Responses

Paratonic variation movements of plant parts in which direction of movement is independent of the direction of stimulus. Nastic responses are like closing of leaflets by touch (E.g. Mimosa pudica) and Epinastic responses are like bending downward of the petiole bringing the leaf to a hanging position. Ethylene causes epinasty of leaves by promoting elongation of cells on the upper side. If one half of a leaf of plant like xanthium is shaded, then the corresponding site of the petiole elongation so that the petiole bends displacing the leaf blade towards irradiated side. Secondly upward bending of the shaded side of the leaf (hyponasty) this mechanism helps the plant in avoiding overlapping of leaves and maximum exposure to Light. The canoppy forms leaf mosaics.

Posted Date: 1/24/2013 1:42:12 AM | Location : United States







Related Discussions:- Nastic and epinastic responses, Assignment Help, Ask Question on Nastic and epinastic responses, Get Answer, Expert's Help, Nastic and epinastic responses Discussions

Write discussion on Nastic and epinastic responses
Your posts are moderated
Related Questions
Mode of nutrition of a rabbit

What is the ranges of tolerance and performance optima? Ranges of Tolerance and Performance Optima :   When it comes to physical factors or resources, most species are able to

Q. Show the Peptide found in the brain? There are as many as 300 peptide neurotransmitters found in the brain. Peptide is a short protein consisting of fewer than 100 amino aci

what is obelia write its external feature and mainly economic important

distinguishing characteristics of phylum platyhelminthes?


What is an example of a parasite relationship? An example would be a flea and a dog. The flea drinks the dog's blood, but does nothing helpful for the dog.

Define Amino acid requirements for Human? Data regarding the essential amino acid requirements of infants, children and adults are given in terms of egg protein and cow's milk

Q. Visualize Patient Ductus Arteriosus? Best view to visualize a patient ductus arteriosus is high parasternal or ductal view. A patient ductus arteriosus in this view is see

Q. Show the list of symptoms? The list of symptoms includes: • Bulky, pale, loose, greasy and foul smelling stools. • Anorexia, feeling of fullness, pain abdomen. The