Archegonia and antheridia mature at different times

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And malefemale reproductive structures are underneath this but it does not fertilize itself because the archegonia and antheridia mature at different times. Produce 1 type of spore that develops into 1 type of gametophyte that produces both archegonia and antheridia. What is the adaptive significance of having archegonia and antheridia on the lower surface of the prothallium rather than on the upper surface? Prevents from drying out, protects from uv rays. What is the adaptive significance of having sperm and egg produced at different times? Prevents self. Learn vocabulary, terms, and more with flashcards, games, and other study tools. The antheridia and archegonia on a prothallium mature at different times to avoid self-fertilization. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Archegonia are vase shaped and located near the cleft of the prothallium. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Recall that in ferns the antheridia and archegonia on a prothallium mature at different times to avoid self-fertilization. The archegonia and antheridia mature at different times to avoid self-fertilization. 2n (diploid) n (haploid) antheridia (male) archegonia (female) rhizoids (roots) gametophyte new sporophyte sorus sporophyte sporangium when the haploid spores are ready, they released ferns produce only one type of spore (they are homosporus). Question are all of the cones the same size? Recall that in ferns the antheridia and archegonia on a prothallium mature at different times to avoid self-fertilization.   what are the adaptive advantages of antheridia maturing at a different time than the archegonia within the. Self-fertilization, antheridia and archegonia mature at different times in some monoicous species, and thus individual plants may appear to be dioicous at certain times of year. In homosporous vascular cryptogams like ferns, single type of spores are produced which give rise to haploid gametophyte on germination. The haploid gametophyte produces both male and female gametes but cross fertilization occurs because of the fact that archegonia (producing egg) and antheridia (producing antherozoids) mature at different times.

TOP 20 Comments

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