Ectoderm produces:

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Mesodaeum

Proctodaeum

Stomodaeum

Both 2 and 3

answer is D.

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Detailed Solution

Concept- The ectoderm is one in all the 2 tissue layers present in diploblasts, alongside the endoderm, and one in every of the three layers found in triploblasts, alongside the endoderm and mesoderm. The ectoderm structures during gastrulation, the cycle in embryogenesis where cells modify and start differentiation.
- A proctodaeum is that the back ectodermal a part of the GI tract. it's formed during embryogenesis by a folding of the outer body wall. it'll shape the lower a part of the anal-canal, underneath the pectinate line, which is able to be lined by stratified squamous non-keratinized (zona hemorrhagica) and stratified squamous keratinized (zona cutanea) epithelium.
- The stomodeum, also known as stomodaeum, is the predecessor to the mouth and the anterior lobe of the pituitary body and is a depression between the brain and pericardium in an embryo. Ectoderm lines the stomodeum, which is separated from the front gut's anterior end by the buccopharyngeal membrane.
- Proctodaeum and Stomodaeum are both produced during embryogenesis, which are covered by ectoderm.
Hence, the proper answer is 4, i.e. Both 2 and three.

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