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Parthenogenesis
The diploid egg produced in the embryo sacs during diplospory and apospory develops into an embryo without fertilization, thus maintaining the sporophytic level of chromosomes. This process of embryo development from an unfertilized egg is called parthenogenesis. The stimulus to form embryos may be pollination dependent. For example, in grasses pseudogamy operates that involves pollination stimulus while in apomictic taxa of Asteraceae and Rubiaceae no such stimulus is required. Pseudogamy has been credited with:
Pollination even otherwise is reported to initiate the development of adventive embryos of Citrus. Likewise, parthenogenetic development of embryo proceeds in apomictic grasses but normal embryos results only when endosperm is also formed.
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 dissimilar for
What is excretion? Excretion in Physiology is the method of elimination of metabolic wastes and other toxic substances from the body.
Post-parturient haemoglobinuria (pph) in cattle and buffaloes The post-parturient haemoglobinuria (PPH) is an acute disease of high yielding buffaloes and cows. The disease oc
Surgical Therapy The clinician may use a surgical approach when non-surgical therapies are not indicated or are unsuccessful. The surgical techniques are modified from those
Define about the Chemotherapy - Cancer? Chemotherapy results in lot of side effects. This is because the drug effects are not specific to cancer cells alone. Even the host cell
Determine about the Halstead's method Reitan adopted Halstead's methods and various test procedures and with them established a laboratory at the University of Indiana. He supp
Q. How does the sexual arousal mechanism in women facilitate fecundation? During sexual arousal in women the vagina secretes substances to neutralize its acidity thus allowing
The oxidation of sugar in the cell of higher organisms takes place in the where
ADP is lower energy form of ATP, containing two (in spite of the three in ATP) phosphate groups attached to the adenine base and ribose sugar.
What is Implant Failure The total failure of the implant to fulfill its purpose which are functional, esthetic and phonetic because of mechanical or biologic reasons.
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