EVERYDAY SCIENCE

Detailed explanation-1: -Mostly the fertilisation is internal. The eggs hatch to produce larvae(indirect development). The larvae are like balls of cells which have cilia and flagella for movement.

Detailed explanation-2: -Reproduction by sponges is by both sexual and asexual means. Asexual reproduction is by means of external buds. Some species also form internal buds, called gemmules, which can survive extremely unfavorable conditions that cause the rest of the sponge to die. Sexual reproduction takes place in the mesohyl.

Detailed explanation-3: -Sponges reproduce by both asexual and sexual means. Most poriferans that reproduce by sexual means are hermaphroditic and produce eggs and sperm at different times. Sperm are frequently “broadcast” into the water column.

Detailed explanation-4: -In sponges, sexes are not separate (hermaphrodite), i.e., eggs and sperms are produced by the same individuals. Sperms leave one sponge and enter another with water current to fertilis the ova (eggs) in Site Thus, fertilisation is internal. Was this answer helpful?