Question

Question 17

17-You discover the embryo of an unknown organism in the 8-cell stage. You then separate the embryo into two bodies of 4-cells each and each then forms an anus from the blastopore. Which of the following organisms might these embryos grow into to?

Group of answer choices

1-sand dollars

2-rotifer

3-spiders

4-could be rotifer or giant squid

5-giant squid

Question 18

18-Which structures are utilized to transport gasses throughout the body of a ladybird beetle?

Group of answer choices

1-spicules

2-book lung

3-tracheal tubes

4-esophagus

Answer 1

1. Deuterostome is a clade of the animal kingdom in which the blastopore gives rise to anus. In contrast, in protostome, it gives rise to mouth. The three major groups of deuterostome are cordata, hemichordata and echinodermata. In the given question, sand dollar belongs to the phylum echindodermata. The rest of the animals belong to lower phyla in the animal kingdom. Hence, the correct answer is (A) sand dollar.
2. Respiration in ladybird beetles is carried out through tracheal tubes. The correct option is (c).