150 likes | 299 Views
XI. Reproduction. Asexual budding b. gemmules formed in stress conditions (contain amoebocytes covered by hard outer coating). XI. Reproduction. 2. Sexual a. Most monoecious = both sexes in same organism (hermaphrodites) egg & sperm produced
E N D
XI. Reproduction • Asexual • budding b. gemmules formed in stress conditions (contain amoebocytes covered by hard outer coating)
XI. Reproduction 2. Sexual a. Most monoecious = • both sexes in same organism (hermaphrodites) • egg & sperm produced • cross fertilization (sperm from one sponge fertilizes eggs from another sponge) • egg + sperm => free-swimming larvae
XI. Reproduction 2. Sexual b. Some dioecious • Separate sexes • Egg OR sperm produced Sponge releasing sperm
XII. Ecological Roles • Habitat for other aquatic animals B. Food for some
XII. Ecological Roles C. Home use: bathing, cleaning, home improvement, other
XII. Ecological Roles D. Medical research • Sponges do not get cancer. Why not? Maybe we can use what keeps them from getting cancer to treat humans………..