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Reproduction ensures continuity of species generation after generations as the older individuals undergo senescence and die. Flowering plants shows sexual mode of reproduction and bears complex reproductive units as male and female reproductive units along with accessary structures. Flower is a modified stem which functions as a reproductive organ and produces ova and/or pollen. A typical angiospermic flower consists of four whorls of floral appendages attached on the receptacle: calyx, corolla, androecium (male reproductive organ consisting of stamens) and gynoecium (composed of ovary, style and stigma) . Table of Contents: a. Structure b. Reproductive Structure c. Androecium d. Microsporogenesis e. Gynoecium f. Megasporogenesis g. Pollination h. Fertilization i. Functions Explore sexual reproduction in flowering plants notes to learn about the reproductive structure of the flower and the process of pollination.

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Plant fertilization is the union of male and female gametes (reproductive cells) to produce a zygote (fertilized egg) Double Fertilization Both the male gametes/sperms participate in sexual reproduction. Two male gametes fuse with one female gamete wherein one male gamete fertilizes the egg to form a zygote, whereas the other fuses with two polar nuclei to form an endosperm Triple fusion is the fusion of the male gamete with two polar nuclei inside the embryo sac of the angiosperm. Porogamy - entry through the micropyle. Chalazogamy - entry through the Chalaza Mesogamy - entry through the middle part or the integuments Steps leading to fertilization Germination of the pollen grain: Stigma function is to provide place of lodging and germination of the pollen grain after pollination. Types of stigmas- Wet stigmas Secrete exudates like water and other nutrients In the form of droplets on the stigma. Exudates made up of a mix of water, lipids, sugars, amino acids, phenolic compounds. Highly viscous and adhesive. Ex: Petunia, Zea etc. Dry stigma Do not secrete exudates Ex: Gossypium Double Fertilization & Triple Fusion: Both the male gametes are involved in the fertilization. Fertilize two different components of the embryo sac - Double Fertilization One fuses with the egg nucleus (syngamy) -> Zygote(2n) second fuses with polar nuclei -> primary endosperm nucleus (PEN). Involves fusion of three nuclei - Triple fusion -> Endosperm(3n) Pollen tube in the synergids: Entry only through micropyle. Guided by oburator Presence of chemotropic substances Collapse of one the synergids prior to entry of the pollen tube. Pollen tube in the synergids: Entry only through micropyle. Guided by oburator Presence of chemotropic substances Collapse of one the synergids prior to entry of the pollen tube. Discharge of pollen tube contents (two male gametes, vegetative nucleus and cytoplasm) into the synergids. Disorganization of tube nucleus Polyspermy &Heterofertilization Heterofertilization - Type of double fertilization in plants in which endosperm and embryo are genetically different. This happens when two different sperm nuclei from two different pollen tubes happen to enter the same embryo sac. Dr. T. Annie Sheron Annie Sheron Kakatiya Government College

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Pollination : Types and significance. The Seminar presented by Biswajit Das L.T.K. College, Department of Botany. In order that a plant is able to produce seeds, the male and female gametes must come together. The male gamete is produced by the androecium within the pollen grain, while the female gamete is produced by the gynoecium within the ovule. Pollination is the process that helps in bringing male and female gametes together. Self-pollination and cross-pollination are two major ways. Flowering plants are adapted to use vivid agents, like biotic and abiotic. .............................................................. Thank You.

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