17. Giardia intestinalis can cause disease in several different mammalian specie

Question

17. Giardia intestinalis can cause disease in several different mammalian species, inchading humans. According to the phylogenetic tree in the figure below, G. intestinalis constitutes a group. analytic B. monophyletie C polyphyletiedin D. 18. All of the following animals are triploblastic EXCEPT B. hydraC. spiderD leech results in genetic recombination but no increase in population size in A. sea urchins 19. A. Budding B. MitosisC.ConjugationD. Binary Fission 20. While you look at some seawater through your microscope, you identify the egg of an unknown animal. Which of the following tests could you ase to determine whether the developing organism is a protostome or a deuterostome? You will see whether the embryo C. develops a blastpore A. develops germ layers B. exhibits spiral or radial cleavageD develops an archenteron 21. The blastopore is formed during A Blastulation B. Gastrulation C. after the mouth is formed D. before Clcavage 22. Which of the following organisms ONLY allows photosynthesis to occur? I. spirogyra Hl. euglena II. amoeba IV. red algae B. L, II, V C.1,V D. II, III, 23. The water vascular system of echinoderms A functions as a circulatory system. B. functions in locomotion and feeding C. moves water through the body and releases water out of the madreporite. D. stores water in the gastrovascular cavity

Explanation / Answer

17. The answer is C. Polyphyletic

As the species involved are from different branches of the cladogram, the group is polyphyletic.

18. The answer is B. Hydra.

Hydra is a diploblastic whereas others are triploblastic.

19. The answer is C. Conjugation.

Conjugation is a method of sexual reproduction in which genetic recombination occurs between two cells without increasing population size.

20. The answer is D. Develops an archenteron.

The difference in protostome and deuterostome is regarding the coelom and archenteron. Protostome forms coelom whereas deuterostome forms archenteron.

21. The answer is B. gastrulation.

The formation of blastopore is the first step of gastrulation.

22. The answer is C. I, II and IV.

amoeba does not carried out photosynthesis.

23. The answer is B. Functions in locomotion and feeding.

It is used in locomotion, food and water storage as well as respiration.

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