Describe asexual and sexual reproduction in Dryopteris.
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Answer:
During asexual reproduction, sporangia produces many haploid spores, which germinates giving rise to the gametophyte, the prothallus. The prothallus bears male sex organ antheridia and female sex organ archegonia, which produce antherozoids and eggs respectively.
Explanation:
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Answer:
Explanation: Asexual Reproduction: Ferns reproduce asexually by spore formation. They are homosporous and spores are known as meiospores which are produced in spore sacs or sporangia. They are aggregated in groups called sori on the undersurface of sporophylls or leaflets. The sori occur in two rows, one on either side of the midrib. Each sorus is protected by a membranous covering called the indusium.
The spores are minute, haploid and dark-brown structures surrounded by a thick, dark and rugged wall, formed of exine and intine. On getting favourable conditions, spores germinate into a short green gametophyte, called prothallus.
Sexual Reproduction: Antheridia produce flagellated antherozoids or spermatozoids which reach archegonia by swimming through water. One of them fuses with the egg cell. The diploid zygote thus formed is called oospore.