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.
A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the G2?
Define Nutritional Management of Neurological Disorders Your friend's aged father, over a period of time has become very confused, forgetful and is unable to do many things he
Subtropical rain forests - Ecosystem In regions of fairly high rainfall but less temperature differences between winter and summer and broad-leaved evergreen subtropical biome
WHY CONSERVE WILD LIFE ? 1 . ECONOMIC IMPORTANCE OF WILD LIFE - (i) Plants - (ii) Animals - (iii) Micro organisms - 2 . ECOLOGICAL BALANCE -
Assignment on CAM
What is biotechnology? The Biotechnology is the application of biological knowledge to obtain new techniques, materials and compounds of pharmaceutical, medical, agrarian, indu
Q. What is the difference between venous and arterial blood? Arterial blood is the oxygen-rich and carbon dioxide-poor blood that irrigates the tissues. Venous blood is the oxy
Are the xylem and the phloem made of living cells? The cells that constitute the xylem ducts are dead cells killed by lignin deposition. The cells of the phloem are living
Define Integrity of cartilage Function of Manganese? Mn plays an important role in proteoglycan biosynthesis, which is essential for the integrity of cartilage. Bone defects ha
DEXTRIN Intermediate product of hydrolysis of starch. It consists of maltose & glucose. It is found in yeast & some bacteria.
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