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.
What is Pancreatic lipase Pancreatic lipase acts on the dietary triacylglycerols after it has been incorporated into the mixed micelle in the intestinal lumen. The lipa
SPINAL CORD (MYELON) It is part of CNS. 45 cm long (in woman 43 cm) & weight 35 gms. Origi n from lower part of medulla oblongeta. Shape - Long cylindrical,
Describe the occurs from a physiological standpoint to the respiratory system when smoke is inhaled and exhaled. You will need to use other sources aside from your textbook.
Morphogenesis of an Ectodermal Derivative During the development of vertebrate body the dissimilar regions in the three germ layers of the gastrula become segregated from each
Industrial Effluents - Causes of Water Pollution Most industrial operations produce effluents that are discharged into nearby river or any other water body. The industrial eff
Protection of Plants against Toxic Substances Plants produce several toxic substances themselves and may also encounter the ones produced by other plants or present in the env
Q. Can mitosis occur in haploid (n) cells and in triploid cells? The mitotic cell division can occur in haploid (n) cells, diploid (2n) cells, triploid (3n) cells, and so on. M
What are plant organs responsible for the perception of light variation? And what is the pigment responsible for this perception? The Leaves are mostly responsible for percepti
Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4
Define Sit and Reach Flexibility component in the humans? The subject sits on a mat with legs extended straight ahead. Legs should be at right angles to a taped the r box, with
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