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Floral Morphology and Sexuality,es. Their life span is also variable; they may be annuals or biennials or perennials. Annuals complete their life cycle in 1 year; they produce seeds towards the end of their life cycle and die. Biennials devote the first year to vegetative growth building up the reserve of resources and enter repro受人支配 发表于 2025-3-24 18:28:03
Pollen Biology,o the atmosphere. At the time of shedding, pollen grains contain either 2 cells (a large vegetative cell enclosing the generative cell) or 3 cells (vegetative cell enclosing the two male gametes formed by the division of the generative cell) (Fig. 5.1a, b). The cytology of pollen at the time of shedhallow 发表于 2025-3-24 20:28:07
Pistil Biology, the recipient of pollen and shows wide variation in its morphology (Heslop-Harrison and Shivanna 1977). The stigma is grouped into two broad types, dry and wet, depending on the presence or absence of secretary fluid (stigmatic exudates) on its surface at the time of pollination. Each type has been不妥协 发表于 2025-3-25 00:23:45
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