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

Explain the effect on serum proteins during pregnancy, Explain the Effect o...

Explain the Effect on serum Proteins during pregnancy? Total serum protein gradually decreases, along with a sharp decline in albumin. There is reduction in serum albumin along

What is resting membrane potential of a neuron, What is resting membrane po...

What is resting membrane potential of a neuron? What is the function of sodium potassium pumps in maintaining it?

Haemodynamics, Haemodynamics :  The type of valves chosen should have exce...

Haemodynamics :  The type of valves chosen should have excellent haemodynamics. In studies at rest and on exercise the valve should produce only acceptable diastolic gradients in

What is lap design, Lap design There are many different flap designs f...

Lap design There are many different flap designs for implant surgery. In practically all situations a mid-crestal incision can be employed (Fig). This is especially so when th

How do keep respiratory system healthy, How do keep respiratory system heal...

How do keep respiratory system healthy? The circulatory system supplies food and oxygen to the body's cell. It carries away waste production of energy. The wastes must then be

Explain reproduction rates variation in bacterial gene, Antibiotic resistan...

Antibiotic resistance is the result of natural selection mutations, the only source of new genetic information available for bacteria. Rapid reproduction rates variation in bacteri

Explain counseling children, Counseling children Assess the child's sta...

Counseling children Assess the child's stage of development. Adjust counseling for a child's  dependency needs,  lack of  experience and  the development tasks faced by  him

Body cavity and coelom - metazoa, Body Cavity and Coelom - Metazoa Vac...

Body Cavity and Coelom - Metazoa Vacuoles, spaces, lacunae and cavities have been of importance in all organisms, may it a be plant or animal. All animals have cavities. The c

Determine the use of natural colourants, Determine the use of natural colou...

Determine the use of natural colourants The use of natural colourants is limited due to their instability, low tinctorial power or price disadvantage.  The trend towards natura

What is class asteroidea, What is Class Asteroidea ? Sea stars are prob...

What is Class Asteroidea ? Sea stars are probably one of the most recognizable of all Echinoderms. Often beautifully colored and symmetrical, they are predators that feed vorac

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