2) You are given an animal embryo at the eight-cell stage. The four smaller cell

Question

2) You are given an animal embryo at the eight-cell stage. The four smaller cells that comprise one hemisphere of the embryo are paraliel relative to the vertical axis of the embryo. During the course of this organism's development the 2ada! Aj blastopore will become the mouth B) blastopore will become the anus v/ C) a layer of mesoderm will not form the folds of the archenteron will form the mesoderm & D 3) Of the annelid classes below, which makes castings that are agriculturally important? ligochaeta B) Polychaeta C) Hirudinea D) A, B and C E) A and B

Explanation / Answer

2. B and D

The explanation describes deuterostomes in which blastopore forms the anus. It alsoforms the mesoderm from the sides of archenteron as a hollow coe­lomic pouches.

3. A. Oligochaeta include eartworms which carry organic material down into lower levels. They also break down dead plant remains and their burrows help air and water travel deep into soil.

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