Quiz 3 Revision

Question 1

What are the three basic divisions of life?

Answer 1

Eukarya, bacteria and archaea

Question 2

What does monophyly mean in the context of animal taxonomy?

Answer 2

A monophyletic taxon is one that includes a group of organisms descended from a single ancestor

Question 3

T/f diffusion is efficient over long distances?

Answer 3

False (small distances = faster diffusion)

Question 4

You conduct an experiment and when preparing to analyse your data, you formulate the following statistical null hypothesis. “There is no difference in the tarsus lengths of the south Island robins on Alva island when compared to those on the mainland.” after you measure the tarsus lengths, you find the lengths are normally distributed, with equal variances so you do a t-test and get a p-value of 0.03. What can you report about the tarsus lengths?

Answer 4

We fail to reject the null hypothesis

Question 5

True or false: All parasitic platyhelmintes have complicated life cycles with more than one host?

Answer 5

True

Question 6

True or false: tape worms have a head and an anus

Answer 6

False

Question 7

What level of organisation do the members of the phylum Platyhelminthes have?

Answer 7

Tissul-organ and organ-tissue

Question 8

Would you expect a flatworm to become extremely large? Why or why not?

Answer 8

No, because Platyhelminthes (flatworms) have constraints on size due to the lack of circulatory and respiratory systems.

Question 9

Is the following statement better described as a research hypothesis or a prediction? “We hypothesise that stentor coeruleus acclimated at 10c will be more active in cold water when compared to s. Coeruleus acclimated at 20c”

Answer 9

Prediction

Question 10

What type of cell cleavage is seen in lopnotrochozoans like flatworms?

Answer 10

The spiral cleavage, results in a highly diverse adult body plan.

Question 11

Define what a blastopore is?

Answer 11

A pit in the side of the embryo, through which cells fated to be endodermal flow so that they leave the outer surface of the embryo and can create a new inner surface. (The blastopore will eventually become either the mouth or anus).

Question 12

What type of symmetry is seen in both flatworms and rotifer?

Answer 12

Bilateral symmetry

Question 13

What is the name of the phylum containing flatworms?

Answer 13

Phylum Platyhelminthes

Question 14

How many cell layers are present in the blastula of flatworms?

Answer 14

Triploblastic (3 layers) -ectoderm, mesoderm and endoderm