T2 Science Final Exam Unit 7 Lesson 13 Answers

Question

T2 Science Final Exam Unit 7 Lesson 13 Answers

1. The genetic engineering of crops is a controversial and debated issue in the media and press. Which of the following would be an argument in favor of the genetic engineering of corn?
Answer: all of these
2. Look at the food web shown below. Which organisms get energy from producers?
Answer: zooplankton
3. Some people have attached ear lobes and some people have free ear lobes. The differences in these traits are caused by
answer: differences in genes
4. Relationships between organisms may be beneficial or detrimental. Which of the following examples shows a relationship in which both organisms benefit?
answer: An African wasp Certolsolen arabicus pollinates a fig tree Ficus sycomorus as it eats the tree's nectar
5. Many animals, including the brittle star and snapping shrimp, make their homes inside sea sponges. Here, the animals not only find safe shelter, but also have a constant flow of well-oxygenated water, and may even eat the substance produced by the sponges. The sponges are not affected in any way by the presence of these animals.Which type of relationship does this represent?
answer: commensalism
6. The Canadian lynx is a large wild cat that lives in the cold regions of Canada. The snowshoe hare is the main prey species that is hunted by the Canadian lynx. The snowshoe hare eats grass, fern, and leaves.If the population of Canadian lynx were to completely disappear, what would most likely happen to the food supply of the snowshoe hare?
answer: The population of snowshoe hare would outgrow the food supply, so there would be less food available.
7. A new predator is introduced into the ecosystem shown in the food web below. This predator feeds on bees and mice. How will this most likely affect the species in this ecosystem?
answer: There will be a decrease in bees and mice which will cause a decrease in the populations of both black bears and foxes.
8. Which of the following is true of a parasitic relationship?
answer: The parasite benefits, and the host is harmed; however, the host is not generally killed.
9. Both of Tim's parents have brown eyes, but Tim has blue eyes. How is this possible?
answer: The characteristic (blue eyes) is carried in a recessive gene.
10. A widow's peak is a V-shaped area of the hairline in the center of the forehead. The allele for having a widow's peak is dominant to the allele for not having a widow's peak.If two parents do not have widow's peaks, what is the probability that their child will have a widow's peak?
answer: 0
11. An organism that contains two different alleles for a trait is said to be _______ for that trait.
answer: Heterozygous
12. Which of the following is true about genes?
answer: In humans, genes are passed to an offspring from two parents.
13. Which of the following is a method of reproduction that generally occurs very rapidly?
answer: asexual
14. Sexual reproduction produces offspring that are genetically _______ to the parents.
answer: similar
15. Some redwood trees reproduce both sexually and asexually. Once a tree reaches maturity, it can reproduce with another tree through pollination and fertilization. The tree then disperses thousands of seeds so that some of them might take root. However, a tree can also reproduce asexually. If it falls down, several smaller trees can sprout from its trunk without the need of fertilization.Why is it advantageous for a redwood to reproduce sexually when it could reproduce asexually instead?
answer: It increases the genetic diversity of the tree's offspring.
16. _______ provide evidence that living things evolved from earlier species.
answer: fossils
17. Which of the following is an example of natural selection?
answer: Rabbits with a mutation for longer, thicker fur survive an unusually cold winter, while many normal rabbits do not survive.
18. Evolution is a
answer: theory because it is an explanation that is supported by extensive observations, experimentation, and reasoning.
19. Diagram 1 shows the fossilized remains of the lower portion of a camel's leg. Each subsequent diagram shows the same portion of a camel's leg, but the diagrams are from progressively later time periods. Diagram 4 shows the most recent fossil. These diagrams demonstrate
answer: how fossil evidence can be used to show the evolution of a species over time.
20. There are approximately 200 species of mice that live all over the world. Deer mice are a particular species of mice that prefer to live in forests, prairies, and fields. It has been observed that deer mice that live in trees tend to have longer tails because they use their tails for balance. Deer mice that live in prairies and fields tend to have shorter tails so they are less likely to be caught when running away from predators. If a forest fire occurred in an ecosystem eliminating the majority of the trees and short-tailed mice are naturally selected over long-tailed mice, the evolution of the mice can be primarily attributed to
answer: environmental factors.
21.Cheetahs are one example of a population that has very limited genetic variation.Which of the following groups of animals are most likely to have a limited variety in the genetics of their population?
answer: animals on the endangered species list
22. What genetic factor is most likely to result in the extinction of an entire species?
answer: a lack of genetic variety in the population
23. Coyotes primarily feed on small mammals, such as rabbits, squirrels, birds, and mice. Many of these prey try to escape from coyotes by burrowing into the ground. Which of the following characteristics is most likely to be naturally selected to increase a coyote population's chances for survival over time?
answer: sharper claws that aid in digging
24. Over time, the climate of a region becomes cooler. How will this most likely affect the species living in that region?
answer: Some species that already have or that develop cold-weather adaptations through natural selection will survive, while species without cold-weather adaptations may go extinct.
25. Small differences between parents and offspring accumulate over time. This process
answer: results in many different types of organisms with different characteristics from their ancestors.
26. Many sponges can reproduce asexually. Ladybugs, on the other hand, reproduce sexually. When small bits of a sponge are broken off—often by currents or by predators—they can float to new regions and regenerate as new sponges. A ladybug must find a mate before it can reproduce.One disadvantage of the sponge's method of reproduction is that
answer: its offspring have little genetic diversity.
27. A potato plant can reproduce asexually so that one potato can often give rise to many other potatoes. Strawberry plants can reproduce sexually.A potato plant puts a large amount of its energy into growing a tuber, which is the part that humans eat. The tuber can grow large and provide energy for the plant during the winter, or it can be used to grow new potato plants. A strawberry plant, on the other hand, puts much of its energy into growing flowers to attract insects that aid in pollination. After fertilization, the strawberry plant must then also grow seeds as well as fruit to attract animals that disperse the seeds.Based on this information, the asexually reproducing potato plant most likely devotes _______ to reproduction than the sexually reproducing strawberry plant.
answer: less energy
28. If there were no decomposers, which of the following would most likely happen?
answer: Some plants might die due to a shortage of important nutrients.
29. Which of the following is a producer in the food web shown below?
answer: grass
30. The image below shows an aquatic food web. Which of the following describes how energy is transferred between the algae and the crustacean?
answer: Energy is transferred from the algae to the crustacean.

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