24. Biotic factors are the living components of an ecosystem. They include all types of plants and animals. Lizards, insects, and cacti are all living, or biotic, factors common in the desert biome. Abiotic factors are nonliving components of an ecosystem. In a desert biome, sand, rocks, heat, and sunlight are abiotic factors. 25. Only are correct. I and II Planting trees to help replace those that were previously cut down is a way that humans can help the environment. The growing population and its use of resources is leading to the destruction of more of the environment. It is important to come up with ways to help the environment rather than harm it. 26. -- 27. Acid rain can harm plants by eroding a plant's leaves. The chlorophyll contained in the leaves of plants is needed to absorb sunlight energy and use it to produce food. Without healthy leaves, the ability to absorb sunlight energy would be limited. 28. Abiotic factors make up the portion of an ecosystem. nonliving In an ocean ecosystem, such as the one pictured, ocean currents and sand are abiotic factors. Plankton and fish are living and are therefore biotic. 29. When a non-native species is introduced to a new ecosystem, it will often have fewer predators than in the ecosystem where it originally evolved. Though the gypsy moth is prey for small mammals and damaged by some viral infections found in the United States, it has fewer predators overall than native species. The most severe outbreaks of gypsy moth larvae happen in urban and developed areas where there are fewer small mammals, such as mice, to eat them. 30. During the water cycle, surface runoff (step 1) flows into rivers, lakes, and streams. Sunlight causes this water to undergo evaporation (step 2). Water vapor can also be released from plants through transpiration. The water vapor remains in the atmosphere until it undergoes condensation (step 3) and returns to the ground in the form of precipitation (step 4). Energy from the Sun drives the water cycle. Without the Sun's heat, water would not be able to evaporate, which means that the other processes also would not occur. 31. the eruption of Krakatau, global temperatures fell by about 1.2°C for one year. This was caused by the increased amount of particulates and volcanic gases in the stratosphere.
24. Biotic factors are the living components of an ecosystem. They include all types of plants and animals. Lizards, insects, and cacti are all living, or biotic, factors common in the desert biome. Abiotic factors are nonliving components of an ecosystem. In a desert biome, sand, rocks, heat, and sunlight are abiotic factors. 25. Only I and II are correct. Planting trees to help replace those that were previously cut down is a way that humans can help the environment. The growing population and its use of resources is leading to the destruction of more of the environment. It is important to come up with ways to help the environment rather than harm it. 26. -- 27. Acid rain can harm plants by eroding a plant's leaves. The chlorophyll contained in the leaves of plants is needed to absorb sunlight energy and use it to produce food. Without healthy leaves, the ability to absorb sunlight energy would be limited. 28. Abiotic factors make up the nonliving portion of an ecosystem. In an ocean ecosystem, such as the one pictured, ocean currents and sand are abiotic factors. Plankton and fish are living and are therefore biotic. 29. When a non-native species is introduced to a new ecosystem, it will often have fewer predators than in the ecosystem where it originally evolved. Though the gypsy moth is prey for small mammals and damaged by some viral infections found in the United States, it has fewer predators overall than native species. The most severe outbreaks of gypsy moth larvae happen in urban and developed areas where there are fewer small mammals, such as mice, to eat them. 30. During the water cycle, surface runoff (step 1) flows into rivers, lakes, and streams. Sunlight causes this water to undergo evaporation (step 2). Water vapor can also be released from plants through transpiration. The water vapor remains in the atmosphere until it undergoes condensation (step 3) and returns to the ground in the form of precipitation (step 4). Energy from the Sun drives the water cycle. Without the Sun's heat, water would not be able to evaporate, which means that the other processes also would not occur. 31. the eruption of Krakatau, global temperatures fell by about 1.2°C for one year. This was caused by the increased amount of particulates and volcanic gases in the stratosphere.
ecology_qs.docx