nucellus sentence in Hindi
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- These earliest ovules had the apical part of the nucellus exposed, from which there was a projection known as a lagenostome ( sometimes also called a salpinx ) that facilitated capture of the pollen and directed it down to the pollen chamber above the megagametophyte.
- Some of the earliest ovules ( e . g ., " Genomosperma " ) consisted of a nucellus ( the equivalent of the sporangium wall ) surrounded by a sheath of slender axes known as a pre-integument . and then " Stamnostoma ".
- There has been some debate as to the exact homologies of these tissues, and it has been argued that the vascularised nucellus was in fact the nucellus and integument that have become fused together, and that the'integument'was homologous to a cupule that contained only one ovule.
- There has been some debate as to the exact homologies of these tissues, and it has been argued that the vascularised nucellus was in fact the nucellus and integument that have become fused together, and that the'integument'was homologous to a cupule that contained only one ovule.
- There are nevertheless many other characters that suggest that the Callistophytales may have been derived from a more primitive lyginopterdalean-like ancestor, including the presence of a lagenostome at the apex of the nucellus, the general structure of the pollen organs, and the overall morphology of the vegetative structures.
- The pollen grains are dispersed by the wind to the female, ovulate cone that is made up of many overlapping scales ( sporophylls, and thus megasporophylls ), each protecting two ovules, each of which consists of a megasporangium ( the nucellus ) wrapped in two layers of tissue, the integument and the cupule, that were derived from highly modified branches of ancestral gymnosperms.
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