Exam 18: The Evolution of Invertebrate Diversity

The graph below is of an index of diversity of arthropods in three different plots of a cornfield. In one of the three plots an insecticide was sprayed. Answer the questions below about this situation. Arthropod diversity in three cornfield plots. -The fact that the lines generally rise from left to right indicates

The digestive tract of a nematode is most like which of the following?

For the following questions consider these characteristics: I. radial symmetry II. bilateral symmetry III. true tissues IV. complete digestive tract -One of the most venomous organisms on earth is an Australian marine invertebrate that kills its prey using cnidocytes. These animals would be expected to have

Which of the following statements about tunicates indicates that these animals are chordates?

Cassiopeia is a marine organism with a medusa body that has an unusual orientation: It floats upside-down. It also has a distinct coloration that is due to algae that live between the epidermis (outer) layer and gastrodermis (inner layer that lines the digestive cavity) of the Cassiopeia. The algae provide food for the Cassiopeia, and the Cassiopeia's orientation provides sunlight to the algae for photosynthesis. Cassiopeia is a/an ________, and the Cassiopeia and the algae have a ________ relationship.

Suppose you use a dissecting microscope to observe organisms that have colonized discs of densely packed, fibrous wood (Masonite plates) that have been submerged in 6 inches of lake water for 8 weeks. You see insect cases (protective shelters), insect larvae, and newly emerged insects with wings. You determine that you are looking at an insect species

Which of the following features is unique to chordates?

Which of these molluscs sometimes do not have an exterior shell?

Which of the following is a unique feature of echinoderms?

-Which part of this figure shows the thorax segment of the lobster?

Invertebrate diversity contributes to all of the following except

Coral reefs are

Which of the following statements regarding cnidarians is true?

You find a small, elongated animal embedded in the sand with one end sticking out. Among other things, it has segmental musculature, a coelom, a notochord, and a complete digestive tract with an anus located partway down the body. This animal is

Complete metamorphosis is considered to occur in a species if

Which of the following animals displays radial symmetry?

How do sponges transport nutrients within their bodies?

-Which part of this figure shows the tube feet of the starfish?

In protostomes

According to the "new" revised phylogeny based on genetic analyses, annelids are a member of the Lophotrochozoa and are most closely related to which of the following groups?