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.
P r o c esse d Chicken Products Preparation of comminuted meat products is the best way to salvage meat from spent hens and broiler parent stock. Incorporation of whole eg
Explain Enzymes Enzymes are the proteins that act as catalysts, speeding the rate at which biochemical reactions proceed but not altering the direction or nature of th
Q. What are the symptoms of congestive cardiac failure? Congestive cardiac failure is a progressive form of cardiomyopathy. The most classical symptom is fluid imbalance due to
Explain the True indications of Endodontic Surgery 1. Failure of non-surgical endo. Re-treatment "persistent lesion" 2. Failure of initial and retreatment will not achieve b
write literature Review on this topic
Respiratory System in Living Organisms Respiration is a necessary physiological process in all living organisms by which they obtain energy for carrying out all the metabolic
Define Advantages of using Bacteria as a source of protein? Advantages of using Bacteria as a source of protein are as follow: 1. High yield of protein (60-80%) 2.
Infective Endocarditis It is an infection of the endocardial surface with micro organisms present in the lesion. The endocardium is contagions with the valves of the heart.
Nicotinamide nucleotides These coenzymes are derived from the vitamin, niacin. They are of two types, nicotinamide adenine dinucleotide (NAD') and nicotinamide adenine dinu
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
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