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 Nagel's Anomaloscope The patient is asked to match a yellow with a mixture of red and green wave lengths. A defect can be detected based on the amount of red and green
To develop the food exchange list, a doctor or dietician keeps in mind four important basic points. These are: 1) Group similar foods in one group. For example cereals, roots,
Explan Ketogenic diet Ketogenic diet: It is occasionally used to facilitate the control of epilepsy. Here, the patient is initially fasted for 48 hours and thereafter,
Hydrology Background: Hydrology is the study of the movement and distribution of water resources. This is an important field of study in a dry climate like Utah. Although c
Sinus Perforations The maxillary antrum can sometimes be inadvertently penetrated. Through careful pre-operative planning using radiographs, including axial scans, this compli
REMOVAL OF TESTIS - It is male hypogonadism. (1 ) BEFORE PUBERTY - Cestration before puberty results in permanent sterility. This condition is eunuchoidism & shows the
Explain the Results of Coarctation of Aorta? Early hospital death in isolated coarctation is around 2 to 10 per cent. In many reports, mortality for older babies approaches 0.
Explain Prophylaxis of lyme disease No vaccine is currently available to prevent Lyme disease in humans. Avoidance of ticks and use of tick repellents such as DEET or picaridin
Nitrate Uptake Nitrate must enter the cells before undergoing assimilatory reduction by the joint action of nitrate reductase and nitrite reductase. Cells accumulate NO - 3
Pregnancy - Fungal Infections Amphotericin B is the preferred treatment for deep fungal infections during pregnancy. Fluconazole is teratogenic in animals and a same pattern of
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