Cycas। Development of Male gametophyte in Cycas । B.Sc.bio.। by Surabhi ma'am

Welcome to the Biology Concept channel. In Cycas, the male gametophyte develops inside the microspore (pollen grain) within the male cone. The process begins when diploid microspore mother cells undergo meiosis to form haploid microspores. Each microspore then develops into a pollen grain surrounded by a thick wall called the exine. The pollen grain initially contains a prothallial cell, a generative cell, and a tube cell. The prothallial cell degenerates, while the tube cell forms the pollen tube after pollination. The generative cell divides into a stalk cell and a body cell. The body cell further divides to produce two large, motile sperm cells equipped with thousands of flagella — a primitive feature unique among gymnosperms. During fertilization, the pollen tube releases the sperm cells into the archegonial chamber, where one sperm fuses with the egg to form a zygote. Thus, the male gametophyte in Cycas is highly reduced but retains ancestral reproductive traits. #Cycas #MaleGametophyte #Gymnosperms #PollenDevelopment #Microspore #PollenGrain #PlantReproduction #BotanyNotes #BScBiology #PlantLifeCycle #Spermatophytes #Fertilization #Cycadales #EvolutionaryBotany #PlantAnatomy #BiologyStudents #ExamNotes