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.
Parenchymal Inflammation Parenchymal inflammation can be due to infectious diseases or acute bronchitis or pneumonia discussion will be mainly on pneumania in the following t
wine turns sour beause of the action of which bacteria? aerobic or anerobic?
Vertical Stratification - Tropical Rain Forest In a tropical rain forest, vertical stratification is very clearly seen. In addition to the different layers described above, th
Unlike the phagocytosis, that is a regulated form of endocytosis carried out by a small number of cell category, pinocytosis is a constitutive process which happens continuously in
Define Food Safety and Regulation? Food sanitation because related to public health and food plant processing; FDA and USDA rules and regulations; food ingredient labelling; nu
Determine the types of blood There are three types of blood cells. They are Red Blood Corpuscles (RBC), White Blood Corpuscles (WBC) or leucocytes and blood platelets or thromb
What is Loud P2 in second heart? It occurs in pulmonary hypertension. In absence of pulmonary hypertension, it occurs when pulmonary trunk is dilated as in Ostium Secundum, ASD
Critical thinking the organization of a rock is much simpler than that of living things. By what other criteria can a rock be well-known from living things? Rocks are not comp
State the Definition of respiration Respiration is an act of breathing. (i.e. rise and fall of the chest). Respiration hastwo parts i.e. inhalation and exhalation. When we bre
What are enzymes? What is the importance of enzymes for living beings? Enzymes are proteins that are catalysts of chemical reactions. From Chemistry it is called that catalysts
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