Customer Service Chat
Get quote & make Payment
Depressions in secondary cell wall is called pit.
A pit present on the free cell wall surface without its partner is called
It consists of 2 parts -
Pit chamber and Pit membrane.
Pit chamber / pit cavity is depression in wall where secondary wall is absent.
Opening of pit chamber into cell is called pit pore / aperture.
Pit membrane is formed of (PCW + middle lamella + PCW) it is "trilaminar".
Pit membrane also called closing membrane.
Pit membrane is permeable due to permeability of primary cell wall.
Pits are of 2 types (depending upon the shape of the pit chamber.)
(i) Simple pit
Pit chamber has uniform width.
Diameter of lumen remains the same.
Found in vessels, tracheids & sclerenchyma.
(ii) Bordered pit
Pit chamber is flask-shaped.
Diameter of lumen is increases from inner to outer side.
A disc-shaped thickening called Torus is present in the middle of pit chamber on pit membrane.
It controls diffusion, it prevents rupturing of pit membrane when unequal pressure is present on its both sides.
Posted Date: 10/5/2012 6:03:42 AM | Location : United States
Ask an Expert
Pits, Assignment Help, Ask Question on Pits, Get Answer, Expert's Help, Pits Discussions
Write discussion on Pits
Your posts are moderated
Write your message here..
Explain types of dietary adaptations for trerapieutic needs, Types of dieta...
Types of dietary adaptations for trerapieutic needs Normal nutrition is the foundation upon which therapeutic modifications are based. We have already discussed in previous
What are the sources of nutrients of cornea, What are the Sources of Nutrie...
What are the Sources of Nutrients of Cornea? Sources of Nutrients of Cornea: 1) Oxygen for the endothelium comes from aqueous humour and for epithelium from atmosphere th
What are carbohydrates, Q. What are carbohydrates? Carbohydrates are i...
Q. What are carbohydrates? Carbohydrates are important organic compounds widely distributed in animals and plants. Plants can synthesize carbohydrates by the process of photos
Infective endocarditis, Infective Endocarditis : All patients with prosth...
Infective Endocarditis : All patients with prosthetic valve come under the high-risk category for endocarditis. They need prophylactic antibiotics if any procedure, which is like
Determine regulation of ph of body fluids, Blood functions to maintain home...
Blood functions to maintain homeostasis in the human body through all but which of the following: Answer moving carbon dioxide away from cells following completion of aerobic metab
Describe ps with atrial right to left shunt in details, Describe PS With At...
Describe PS With Atrial Right To Left shunt in details? This group of patients has cyanosis due to light to left shunt at atrial level. The diminution in PA pressure and PBF ma
Define the concept of health - public nutrition, Define the Concept of Heal...
Define the Concept of Health - Public Nutrition? The most widely accepted definition of health is the one given by WHO (1948) in the preamble to its constitution, Box 1 gives t
Controlled hypothermia, Controlled Hypothermia Although birds and mamm...
Controlled Hypothermia Although birds and mammals frequently function in the homeothermic mode and maintain relatively high stable temperatures, many mammals and some birds ha
What are the functions of insulin and glucagon, What are the functions of i...
What are the functions of insulin and glucagon for the blood glucose control? Glucagon enhances glycemia and insulin reduces it. They are antagonistic pancreatic hormones. Gluc
Chordata and its characteristics, Phylum Chordata- Chordata name given ...
Phylum Chordata- Chordata name given by Balfour. Herst put hemichordata into separate phylum. Lamarck gave the word tunicata & vertebrata. Pisces classified by Rom
Accounting Assignment Help
Economics Assignment Help
Finance Assignment Help
Statistics Assignment Help
Physics Assignment Help
Chemistry Assignment Help
Math Assignment Help
Biology Assignment Help
English Assignment Help
Management Assignment Help
Engineering Assignment Help
Programming Assignment Help
Computer Science Assignment Help
Why Us ?
~24x7 hrs Support
~Quality of Work
~Time on Delivery
~Privacy of Work
Human Resource Management
Literature Review Writing Help
Follow Us |
T & C
Copyright by ExpertsMind IT Educational Pvt. Ltd.