Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Central Cell - Synergids
It is the largest cell of the embryo sac, and the mother cell of the endosperm. The enlargement of the embryo sac after the last nuclear division is mainly due to the inflation of the large central vacuole of the central cell. The vacuole in the central cell is presumably the reservoir of sugars, amino acids and inorganic salts. The nuclei of the central cell, also called the polar nuclei, are very large, and are characterized by a conspicuous nucleolus. They are present either in the centre of the cell, suspended by cytoplasmic strands, or in the cytoplasm close to the egg apparatus. In the latter case the chalazal portion of the embryo sac is occupied by a large vacuole. The two polar nuclei fuse before or during double fertilization to form the secondary nucleus.
The cytoplasm of the central cell is rich in plastids, mitochondria, numerous, dictyosomes, and ribosomes or small polysomes. This cell appears to be the centre of intensive synthetic activity in the embryo sac. The thickness of the central cell wall is variable. It is thickest in the regions in contact with the nucellus. Where the central cell touches the egg and synergids, it shows the common feature of partial wall. It becomes thinner towards the chalazal end of the egg apparatus, and finally, in the chalazal region there is no wall between the plasma membranes of the central cell and those of the egg and the synergids. The central cell is connected along with the.egg, synergids, and the antipodals through plasmodesmata connections.
Skin The skin or integument is the outer covering of the body and have appendages i.e. nails and hairs. The outer layer of skin is known as epidermis; the inner layer is dermis
how are the listed from largest group to smallest group
Ichnology : This is the study of foot prints. Ichnology is a type of branch of geology which deals with traces of organismal behavior like as burrows or footprints. It is commonly
Q. Which are the structures that are part of the nervous system? The structures that form the nervous system can be divided into the peripheral nervous system (PNS) and the cen
Illustrate the types of Bone Remodeling Bone remodeling occurs on existing bone surfaces. However, unlike modeling, remodeling cannot cause large changes in bone structure at a
What category do pisces, mammalla, amphibia, reptilia and aves fall into
Circuitry and Priming : The cardio pulmonary bypass circuit consists of oxygenator, tubings, cannulae, cardiotomy reservoirs and cardioplegia attachments. The first step is to pri
Q. How different is the simple cuboidal epithelium from the columnar epithelium? Where can these epithelia are found in the human body? The simple cuboidal epithelium is made o
Define Maternal Dietary Intake and Foetal Outcome? Among the various nutrients, energy intake appears to be the most crucial, for developing countries. Studies from India have
What is the drug permeability across the cornea? Drug permeability across the cornea depends onto: a. Lipid and water solubility of the drug b. Molecular size, weight and
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd