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Those who wish to adopt the textbooks are required to send a request to NCERT, upon which soft copies of the books are received. The material is press-ready and may be printed by paying a 5% royalty, and by acknowledging NCERT. [11] The textbooks are in color-print and are among the least expensive books in Indian book stores. [11]
Reptile eggs, bird eggs, and monotreme eggs are laid out of water and are surrounded by a protective shell, either flexible or inflexible. Eggs laid on land or in nests are usually kept within a warm and favorable temperature range while the embryo grows. When the embryo is adequately developed it hatches, i.e., breaks out of the egg's shell.
Grade AA and Grade A eggs are best for frying and poaching, where appearance is important. U.S. Grade AA Eggs have whites that are thick and firm; have yolks that are high, round, and practically free from defects; and have clean, unbroken shells. U.S. Grade A Eggs have characteristics of Grade AA eggs except the whites are "reasonably" firm.
Global egg production was expected to reach 65.5 million tonnes in 2013, surpassing all previous years. [62] Between 2000 and 2010, egg production was growing globally at around 2% per year, but since then growth has slowed down to nearer 1%. [62] In 2018, egg production reached 76.7 million tonnes, a huge 24% growth since 2008. [63]
The UK alone consumes more than 34 million eggs per day. [85] Hens of some breeds can produce over 300 eggs per year; the highest authenticated rate of egg laying is 371 eggs in 364 days. [86] After 12 months of laying, the commercial hen's egg-laying ability declines to the point where the flock is commercially unviable.
The egg is not retained in the body for most of the period of development of the embryo within the egg, which is the main distinction between oviparity and ovoviviparity. [1] Oviparity occurs in all birds, most reptiles, some fishes, and most arthropods. Among mammals, monotremes (four species of echidna, and the platypus) are uniquely oviparous.
Sawfly laying eggs in a plant, using the serrated saw-like ovipositor for which the group is named. The suborder name "Symphyta" derives from the Greek word symphyton, meaning 'grown together', referring to the group's distinctive lack of a wasp waist between prostomium and peristomium. [4]
The cosmic egg, world egg or mundane egg is a mythological motif found in the cosmogonies of many cultures and civilizations, including in Proto-Indo-European mythology. [1] Typically, there is an egg which, upon "hatching", either gives rise to the universe itself or gives rise to a primordial being who, in turn, creates the universe.