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  4. How many from the following phylum has external fertilisation with indirect development? Porifera, Ctenophora, Echinodermata, Hemichordata

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Q. How many from the following phylum has external fertilisation with indirect development?
{Porifera, Ctenophora, Echinodermata, Hemichordata}

NTA AbhyasNTA Abhyas 2020Animal Kingdom

Solution:

External fertilisation with indirect development is present in aquatic animals which belongs to phylum $ \rightarrow $ Ctenophora with cydipidd larva, Echinodermata with the different larva and Hemichordata with tornaria larva.
In Porifera, fertilisation is internal and development is indirect having a larval stage which is morphologically distinct from the adult.