lu.s. Cellular LTE l U.S. Cellular L Section #-/Group # Name:, Biology 142-Sprin
ID: 212112 • Letter: L
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lu.s. Cellular LTE l U.S. Cellular L Section #-/Group # Name:, Biology 142-Spring 2018 Homework Set 7 (10 points) 1. (1 pt.) What is the logical type of dispersal system for this fruit? a. Bird dispersal b. Wind dispersal c. Large mammal consumption of fruit d. Water dispersal 2 (1 pt) What type of pollination strategy would this plant show? a. Water pollination b. Wind pollination c. Fly pollination d. Butterfly/bee pollination e. Bird pollination 3. (2 pts.) Many animals such as worms and snails are hermaphrodites a. Describe what it means to be a hermaphrodite. b. Many hermaphrodites cannot self-fertilize; they still need to encounter another self-fertilization individual of their species with whom they can exchange sperm. Why s not as common with hermaphrodites? In other words, what might be a disadvantage of self-fertilization? 4. (2 pts.) We see 3 different developmental strategies in mammals monotremers eggs), marsupials (part internal and part external development), and placentals (fully internal development) Each type of development has its advantages and drawbacks. For any ONE of these (your choice), state one benefit and one drawback 5. (1 pt) Why do animals like cnidarians, particularly corals and anemones, undergo metamorphosis, in other words, why is metamorphosis a successful strategy for them 6. 1 pt) For animals that undergo metamorphosis,what is one risk they could potentially face 7. (1 pt) The germ layer that distinguishes triploblasts from diploblasts is the: ENDODERM MESODERM / ECTODERM (circle one). What is one structure that is derived from this tissu layer? 8. (1 pt) Sea urchins are: PROTOSTOMES/DEUTEROSTOMES (circle one), which means they havec cell cleavage cell fate and coelomExplanation / Answer
Answer:
3.
A). Hermaphrodite refers to the organism that has both female and male sex organs and sex characteristics in them.Most of the invertebrates are hermaphrodite.
B).
Most of the hermaphrodite can not self fertized because it may increase Genetic defects and it reduces Genetic diversity.
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