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Q. What is the chorioallantois membrane present in the embryonic development of birds and reptiles? How does this membrane participate in the energetic metabolism of the embryo?
The chorioallantois membrane is formed by juxtaposition of some regions of the allantois and the chorion. Since it is porous the chorioallantois membrane allows the passage of gases between the exterior and the embryo thus making aerobic cellular respiration possible.
Sterility in Angiosperms Sterility in angiosperms may arise due to several causes. Either the anther may not be formed, or anthers are formed but meiosis may be abnormal. A
E c z e m a It is inflammatory reaction of epidermal cells to the substances to which these cells are sensitized. Such substances may be present either in the external or
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Define Health and Feeding Problems among Elderly? Malnutrition, both obesity and under nutrition, are common problems linked with elderly. Some of the common disorders such as
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Microevolution is: the change in allele frequency in a population. Cannot occur if genetic equilibrium is reached. Results in the formation of a new species. Is influenced by mutat
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