chalaza chalaza the chalaza (/kəˈleɪzə/; from greek χάλαζα "hailstone"; plural chalazas or chalazae, /kəˈleɪzi/) is a structure inside bird eggs and plant ovules. it attaches or suspends the yolk or nucellus within the larger structure. in animals the contents of a chicken egg with chalaza clearly visible. in the eggs of most birds (not of the reptiles), the chalazae are two spiral bands of tissue that suspend the yolk in the center of the white (the albumen). the function of the chalazae is to hold the yolk in place. in baking, the chalazae are sometimes removed in order to ensure a uniform texture. in plants in plant ovules, the chalaza is located opposite the micropyle opening of the integuments. it is the tissue where the integuments and nucellus are joined. nutrients from the plant travel through vascular tissue in the funiculus and outer integument through the chalaza into the nucellus. during the development of the embryo sac inside a flowering plant ovule, the three cells at the chalazal end become the antipodal cells. diagram of angiosperm ovule showing location of chalaza chalazogamy in most flowering plants, the pollen tube enters the ovule through the micropyle opening in the integuments for fertilization (porogamy). in chalazogamous fertilization, the pollen tubes penetrate the ovule through the chalaza rather than the micropyle opening. chalazogamy was first discovered in monoecious plant species of the family casuarinaceae by melchior treub, but has since then also been observed in others, for example in pistachio and walnut. notes palmer, brent david. functional morphology and biochemistry of reptilian oviducts and eggs : implications for the evolution of reproductive modes in tetrapod vertebrates. pratiyogita darpan (september 2006). competition science vision. pratiyogita darpan. eggslist of egg topicstypes bird fish and amphibian monotreme fossil record cephalopod fish reptile (dinosaur) pathology biology allergy egg cell embryo ichthyoplankton oogamy oogenesis ootheca ovary oviduct oviparity ovoviviparity ovulation spawn tooth trophic zygote components yolk white shell and membrane chalaza as food list of egg dishes balut benedict boiled century coddled custard desserts deviled eggnog fried iron meringue omelette onsen tamago poached powdered pickled roe scotch scrambled shirred smoked soufflé tea in culture balancing carton decorating easter egg egg-and-spoon race egg drop competition egging fabergé egg free range humpty dumpty hunt oology oomancy organic organizations ovo vegetarianism pysanka vegreville egg rolling tapping tossing category commons this article is issued from wikipedia. the text is licensed under creative commons - attribution - sharealike. additional terms may apply for the media files.