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
Amantadine Treatment with oral amantadine or rimantadine begun within 48 hours after the onset of illness decreases the duration of fever and symptoms by about 1 day. Whether t

explain the genotypes for each blood type and how this is an example of codominance. Blood type- A, AB, B, 0

Q. How has the importance of the brain evolved from fishes to reptiles? From the least to the most complex brain structure, it is evident that the brain, from fishes to beings

Explain the Disadvantages of Fixation? Fixation has following disadvantages also. These are highlighted herewith: (i) It distorts the cell's appearance. (ii) Motility can

Nutrition As we have said earlier all animals are heterotrophs and require food from the environment. What is this food made up of? If the food of a number of different animal

CYTOCHEMISTR Y OF PROTOPLASM - It is supper mixture or mixture of mixtures . 3 4 elements present in it. 1 3 elements are universal. e.g. C, H, O, N, P, K, S,

Pantothenic acid (Calcium pantothenate) Calcium pantothenate is a white, loose, faintly hygroscopic powder without odour and of bitter taste. It is easily soluble in water, gly

EMBO L Y - The embolic morphogenetic movements are concerned with the inward migration of prospective endodermal and mesodermal blastomeres from the external surface of blast

Hirudinea - Feeding and Digestion in Annelids Hirudinea involves free living and ectoparasitic leeches. Leeches are blood suckers. The digestive system contains a preoral cham

D o w n e r s cow syndrome The Downer's cow, otherwise known as creepers, is commonly a fatal condition of dairy animal associated with the unsuccessful treatment of cas