Biology-Sexual reproduction in plants @ khotyanz channel
Channel: Grace Kote
Date: 2022-12-12

@khotyanz channel
 In this video,we are reviewing a sexual reproduction in plants.
 There are 390,900 estimated plant species known to science,did you knew that.This diversity of plant species is in part due to sexual reproduction.In plants,sexual reproduction is carried out in the flowers.The flowers contain the sexual organs.
 There are a different part of a flower.The petals and sepals help to protect the flower bud and can be highly colored or scented to attract pollinators.
 The stem and receptacle are parts that connect the flower to the rest of the plant.
 The stamen is the male part of the flower.It consists of the anther where pollen is produced and the filament w/c is the stalk that supports the anther.These structures are responsible for the product and positioning of pollen,the male gamete.
 The carpel is the female part of the flower and this consists of 3 parts,the stigma is the sticky landing for pollen,the style is where the pollen grain descends and the ovary is where the female gametes or sex cells are located.Ovules produce female gametes w/ in the ovary.
 So how does pollination work?
 Pollination is the transfer of pollen from the male anther of one flower to the female stigma of another.Flowers can be pollinated in different ways.By wind or water or by pollinators such as insects,birds and other animals.
 Flowers pollinated by pollinators are structurally different from those pollinated by wind and water.
 There are differences in scent,color and size of petals and the positioning of the stamen and style.Why do you think they are different?
 Pollinators are very important to our food supply.They pollinate plants that are responsible for bringing us one out of every 3 bites of food.
 Fertilization can occur,once a plant has been pollinated.This results in the production of seeds.A mature pollen grain containing 2 male sexcells has landed on the "female stigma"of the same species.The pollen grain grows a pollen tube that goes down the "female style"to the ovary which enters through an opening called the "micropyle".The male sex cells travel from the pollen grain down to the pollen tube to the female ovule.In here,one male sex cell fuses,with the female egg fertilizing it.This develops into a seed.The other male sex cell attaches 2 cells in the embryo sac,forming an "endosperm".This provides the starchy food for the seed to grow.The ovary enlargest becomes a fruit,sorrounding the internal seeds.
 The fruits and seeds are dispersed in many ways,some even by us humans,where they will again grow into a plant,under the correct conditions completing the long cycle of sexual reproduction in plants.
 Thats why,we have sexual reproduction in plants.
 "Pollination has to happen before fertilization".The main pollen is produced in the anther,where it is then dispersed during pollination.The female parts of the flower are the ovary,stigma and style.

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