Nastic and epinastic responses, Biology

Assignment Help:

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.


Related Discussions:- Nastic and epinastic responses

Fermentation products -distilled liquor products, Normal 0 fals...

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Define tests to measure flexibility component in the humans, Define Tests t...

Define Tests to Measure Flexibility Component in the Humans? The flexibility component measures the elasticity or range of motion around a joint. This component of physical fi

Classification of plants and animals, Q. Classification of plants and anima...

Q. Classification of plants and animals? The first and foremost step in the classification of plants and animals is the. grouping together of individual organisms on the basis

What is osmotic pressure, Q. What is Osmotic Pressure? Ans. Import...

Q. What is Osmotic Pressure? Ans. Important characteristic of a cell is 'osmosis'. You would recall reading about osmosis in the Applied Physiology Course in Unit 8. I

Etiology and clinical features - neurological disorder, Define Etiology and...

Define Etiology and Clinical Features that causes neurological disorder? The cause of this neurological disorder can be mechanical or paralytic. The mechanical cause is primari

Why plant cycle know as alternation of generations, Q. Why is the plant lif...

Q. Why is the plant life cycle known as alternation of generations? The plant life cycle is called as alternation of generations because in this cycle there are two different f

Diseases, what diseases are caused by trypanosoma and entameoba histolytica...

what diseases are caused by trypanosoma and entameoba histolytica

Sample outline of child history questionnaire, Sample Outline of Child Hist...

Sample Outline of Child History Questionnaire Basic identifying data: Child's name Date of birth Date of evaluation Person referring for evaluation Per

Which are the brain regions associated with memory, Which are the brain reg...

Which are the brain regions associated with memory? According to researchers some of the main regions of the nervous system associated with the memory phenomenon are the hippoc

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