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
A 42 year old woman decides to lose weight on a diet prescribed by an anorexic friend. She loses about 30 pounds in 45 days, but her serum potassium level falls to 2.1 mmol/L (norm

The phases of the cardiac cycle are: 1)  Atrial Systole This begins with the P-wave of the ECG. The atrio-ventricular valves are open and the ventricles are relaxed (diastole

My friend was injured several years ago in a car accident and she was diagnosed with a herniated disc. Can you please explain using the correct anatomical terminology what herniati

Define the Factors that Affect the Rate of Drying? Factors that affect the rate of drying are as follow: 1) The fat content of the food-Higher fat contents generally result

What proportion of children with Down syndrome do you expect when women with Down syndrome have children with men who have 46 chromosomes justify your answer?

Q. What are the two divisions of meiosis and what are the major events that occur in those divisions? Meiosis is divided into first meiotic division, or meiosis I, and second m

What Food items include in clear liquid diet -  Clear, fat free soups/broths -  Light coffee, tea (without milk or cream) -  Strained fruit juices -  Tender coconut wa

Define Vitamin and mineral supplements for treatment for PEM? All cases of severe PEM require multivitamin preparation to meet the increased demands during recovery. Iron (60 m

Group Psychotherapy:  Definition  Group psychotherapy  is a treatment of psychological problem in which two or more patients interact in the present of a psychotherapist.

Define the Cooper's Run (12 minute run) Method? To undertake this test, a 400 metre running track is required-marked every 100 m and a stop watch. The test comprises of noticin