Question

1 complete summary table a - 1 in the appendix, filling in the characteristics of roundworms in the appropriate row.
2 for a parasitic organism such as ascaris, what would be the selective advantage of a cuticle?
3 for a free - living, terrestrial nematode, what would be the selective advantage of a cuticle?
4 in many parasitic species the sex ratio of males to females is skewed (not 1:1). which sex do you suppose would tend to be more numerous? why?
5 explain the difference between a pseudocoelom and a true coelom.
6 define ectotherm.
7 the hookworm, necator americanus, which infects some 900 million people worldwide, may ingest more than 0.5 ml of human host blood daily. given that an infection may number more than 1,000 individual hookworms, calculate the total volume of host blood that may be lost per day to a severe nematode infection.

Explanation:

1.

No information about Table A - 1 in the Appendix is given, so unable to provide specific content. But generally, one would look up characteristics of roundworms like body structure, feeding habits, reproduction mode etc. and fill in the appropriate row.

The cuticle in a parasitic organism like Ascaris provides protection. It resists the host's digestive enzymes and immune - system attacks, allowing the parasite to survive and thrive within the host.

For a free - living terrestrial nematode, the cuticle serves multiple functions. It provides structural support, helps in preventing desiccation (drying out) in a terrestrial environment, and also aids in locomotion as muscles attach to it.

Answer:

No answer can be provided without the Appendix table.

2.