so i really need help with my test , its my Unit 7 Biomes Biodiversity Exam Honors test ... so i just need answers or a answer sheet.....idk what else to say

Some questions (c) 2017 by Certica.

P age 2 GO ON 1 Refer to the table. Which plants are more adapted for the tundra?

A 1 B 2 C 3 D 4 2 If your local environment begins to turn into a desert, what will most likely happen to the organisms in the environment?

F The populations of organisms currently existing in the environment will increase. G The populations of organisms currently existing in the environment will not be affected. H The new desert environment will be unable to support any populations of organisms. J A different variety of organisms will be supported rather than the ones that currently exist. P age 3 GO ON 3 Four students were asked to observe microhabitats of their schoolyard and describe how microhabitats are able to support different varieties of organisms. Their observations and responses are shown below.

Which student best describes how microhabitats are able to support a variety of organisms?

A Student 1 B Student 2 C Student 3 D Student 4 P age 4 GO ON 4 An area is semiarid (low to medium amounts of rainfall), has few trees, and is home to ground-nesting birds. This area is most likely part of which biome?

F tundra G taiga H grassland J desert 5 Which environmental factor would most likely prevent an orange tree from surviving in the desert?

A the lack of moisture B the high levels of heat C the extra amount of wind D the low levels of sunlight 6 High average daily temperature and heavy annual precipitation are found in a F desert. G grassland. H rainforest. J tundra. 7 Which biome has the most vegetation?

A desert B forest C grassland D tundra P age 5 GO ON 8 The three global biomes in the table are home to different species of fox and members of the deer family.

Characteristics of Three Biomes Biome Temperature Range Precipitation (cm per year) Typical Plants Fox and Deer Temperate deciduous forest –30 to 30°C (–22 to 86°F) 75 to 150 oaks, maples, small flowering plants gray fox, white-tailed deer Boreal –40 to 20°C 30 to 90 fir, pine, spruce red fox, (coniferous) (–40 to 68°F) forest Tundra –40 to 18°C (–40° to 64°F) moose 15 to 25 low-growing plants arctic fox, caribou (reindeer) Of the three biomes, why would you expect tundra to have the fewest number of animals in each population?

F It has the shortest plants. G It has the least amount of food. H It has the fewest trees for shelter. J It has the coldest temperature. 9 The temperate deciduous forest and temperate grassland biomes have the same maximum temperature. Which of the following is a reason they have different plant and animal species?

A they are at different altitudes (one is further up a mountain than the other) B they are at different latitudes (located at different ranges from the equator) C the forest gets more precipitation D the grassland gets more precipitation 10 One biome includes bearberry, a short plant with small, waxy leaves, shallow roots, and flowers that bloom quickly in the short growing season. Another biome includes tall grasses that can survive fires due to roots that extend 6 to 7 meters deep during the long growing season. What is most likely true about the two biomes?

F They have the same temperature range but different rainfall ranges. G They have the same temperature range and the same rainfall range. H They are at different latitudes but have the same temperature range. J They are at different latitudes and have different temperature ranges.

P age 6 GO ON 11 What effect does the increase in human population most likely have on the biodiversity of the plant species found in the rainforest? A As human population increases, the succession in the rainforest leads to increased biodiversity. B As human population increases, the diversity of larger rainforest plant species increases. C As human population increases, the number of individual rainforest plant species increases. D As human population increases, the diversity of rainforest plant species decreases. 12 A non-native animal (invasive species) is introduced into a diverse, mature ecosystem. Assuming that the non-native animal has no natural enemies, what immediate affect will the non-native species have on the ecosystem? F The number of native animal species will not be affected at all. G The new non-native animals will develop new natural enemies. H The native species will become more like the new animal. The new non-native animal will soon die out. J The number of native animal species will decrease.

P age 7 GO ON 13 Which of the following would most likely be true about ecosystems with abundant abiotic factors such as light and water?

A The ecosystem will contain all of the same types of producers. B The ecosystem will have a hard time sustaining any consumers. C The ecosystem will contain too many consumers. D The ecosystem will contain a variety of producers. 14 What would be one possible explanation for why an ecosystem with low biological diversity could suffer severe biological harm if even small changes were to take place in the ecosystem?

F The ecosystem has abundant resources, and the organisms depend on each of them. G Abiotic factors such as light and water are very plentiful, affecting the interactions between different species. H Each of the species is more dependent on a low number of factors in the ecosystem. J Each species is specialized to the limited conditions of the ecosystem and is therefore more able to adapt.

P age 8 GO ON 15 Which ecosystem would most likely survive if the grasses were destroyed by a plant virus?

A Ecosystem 1, because there is a variety of producers that support the ecosystem. B Ecosystem 2, because the grasses could grow back quickly. C Ecosystem 1, because there are fewer primary consumers. D Ecosystem 2, because there are not many predators. P age 9 GO ON 16 When Darwin researched finches during his expedition, he noticed that they had different beaks allowing them to be successful in different environments.

Why is this an advantage for the finch population?

F It allows for great diversity among the finches, allowing the population to survive even if there is a ecological change. G It allows the finches the ability to help other finches gather food. H It enables the finches to invade the habitats of other organisms to gather food. J It gives finches the ability to change their diet from year to year depending on available food. 17 How does secondary succession help restore equilibrium to a region destroyed by a flood?

A It increases the number and types of species. B It brings back species from extinction. C It stops other floods from occurring. D It decreases the rate of evolution. P age 1 0 GO ON 18 These graphs show changes in the number of species over time. Which one BEST represents the changes in the number of species over time as an ecosystem in secondary succession becomes a climax community?

F G H J 19 Which of the following situations contributes to the sustainability of an ecosystem? A Increase in biodiversity B Decrease in biodiversity C Extinction of a population from the ecosystem D Removal of many populations of organisms P age 1 1 GO ON 20 Which statement below best describes how biodiversity contributes to the sustainability of an ecosystem?

F A variety of plant and animal species allows for more survivors of a natural disaster. G Having more species in an ecosystem allows the human population to increase in size. H Low biodiversity reduces the competition for resources, which helps native species survive. J Fewer species in the ecosystem reduces the likelihood that disease spreads through the ecosystem 21 The food webs below model relationships among organisms in two ecosystems. Students were asked to make a claim supported with evidence to answer the question, "Which ecosystem would be most sustainable if all the grasses died from severe drought?" What claim is valid and supported by the evidence? A The forest ecosystem is most sustainable because there are more top predators. B The grassland ecosystem is most sustainable because there are fewer organisms that eat grass. C The forest ecosystem is most sustainable because most of the animals can eat other organisms. D The grassland ecosystem is most sustainable because there is less competition for food. P age 1 2 GO ON 22 Why is biodiversity important in an ecosystem?

F The number of offspring for a species increases. G It creates more competition for resources among species. H The number of organisms in the food pyramid will increase at each trophic level. J It leads to stability of an ecosystem, which enables it to withstand a disturbance. 23 Which of these is a threat to the survival of an ecosystem? A predator-prey population cycles B less biomass at higher levels of the food web C a shrinking variety of animal and plant species D competition among some consumer populations 24 Pioneer species such as lichen and moss inhabit an area after a major disturbance, such as a volcanic eruption. Over time, other species are found in the disturbed area, and the number of pioneer species decreases.

Why does the number of pioneer species decrease?

F The amount of available sunlight is reduced. The pioneer species can no longer thrive. G The area has more soil to support complex plants. The competition decreases the pioneer species role. H The area is more susceptible to the wind. Seeds are captured in the pioneer plants and germinate at a higher rate. J The temperature is not as extreme as it was following the disturbance. Fewer of the pioneer species reproduce. P age 1 3 GO ON 25 Primary succession occurs when a land area is formed. This may occur following a volcanic eruption, when new sand is deposited on a beach, or when a glacier retreats. The first plants attach to rocks and break them down to produce soil. Over time, grasses and flowers are replaced by shrubs and trees. Which graph illustrates the relationship between number of species and time in an area where primary succession is occurring?

A B C D P age 1 4 GO ON 26 The role of a pioneer species in primary succession is to change a bare habitat into one that is suitable for other organisms. A species that is responsible for primary succession in an ecosystem is MOST likely able to — F survive any predator G migrate during the winter H live at high altitudes J carry out photosynthesis 27 Which of the following sequences MOST likely represents ecological succession on a recently abandoned wheat field?

A grasses - flowering plants - shrubs -native trees B native trees - shrubs - flowering plants - grasses C shrubs - grasses - native trees - flowering plants D flowering plants - native trees - shrubs - grasses 28 Lava from an underwater volcano piles up over many years. Eventually, the pile of lava sticks up above the ocean surface, forming a new island. To show that succession is occurring on the island, it would be MOST helpful for a scientist to measure changes in — F average temperature G day length H annual precipitation J soil depth P age 1 5 GO ON 29 The diagrams above show an ecosystem during different stages of ecological succession.

In which order will these stages occur, from earliest to latest? A 4, 2, 1, 3 B 1, 2, 3, 4 C 3, 1, 4, 2 D 2, 4, 3, 1 30 Which of these types of environments is MOST LIKELY to experience the arrival of pioneer species?

F an old growth forest G an undisturbed prairie H an established mountain lake J a newly formed volcanic island P age 1 6 ST OP BE SURE YOU HAVE RECORDED ALL OF YOUR ANSWERS ON YOUR ANSWER DOCUMENT