Question

1. deforestation is the result of humans cutting, clearing, and removing trees to create farmland, pastures, and other less diverse ecosystems. which of the following would support the reduction of deforestation in tropical rainforests?

a. crops and cattle waste release carbon dioxide into the atmosphere, which is a leading cause of global warming. a reduction in deforestation would stop farming in the area.
b. biomass is an alternative energy source which uses trees and plant material as fuel. a reduction of deforestation would reduce biomass and increase global warming because people would use more fossil fuels.
c. trees use carbon dioxide in the process of photosynthesis, which reduces co² in the atmosphere. burning huge masses of trees releases large amounts of co². reducing deforestation lessens the amount of carbon dioxide in the atmosphere.
d. deforestation removes trees and plant material so that crops and pasture land can be planted. all plants take in carbon dioxide and give off oxygen, therefore, the air quality and the effects of global warming do not change.

1. read the passage below and answer the question that follows.

biofuels
biofuel is an energy source that has been available since the era of henry ford and his invention of the model t. biofuel uses plants to produce fuel for motorized vehicles. one of the earliest implementations of biofuel was the usage of peanut oil in diesel engines. however, the use of biofuel drastically declined once a large deposit of petroleum, a cheaper alternative, was found. peanut oil can no longer be used in today’s cars due to the structure of modern car engines.

in recent years, public interest in utilizing biofuels has risen, as concerns over global warming and climate change have increased. thus, biofuel research and usage has been on the rise once again. by 2017, most gas stations sell gasoline that is diluted up to 10% with a corn - based biofuel called ethanol. the integration of ethanol has prevented the cost of regular gasoline from skyrocketing.

which advantages promote the use of peanut oil in diesel engines?
select two choices
a. less cost
b. less air pollution
c. easily replenished
d. increases carbon dioxide
e. increase in global warming

1. people in certain regions use solar cookers to cook food. what is the advantage of using a solar cooker?

a. shorter cooking time
b. cooking in any weather
c. ability to cook large meals
d. no emission of harmful gases

Explanation:

Question 7

• Option A: The statement about crops and cattle waste releasing CO₂ is not related to reducing deforestation's impact. Also, saying a deforestation reduction would stop farming is incorrect.
• Option B: Biomass using trees as fuel means less deforestation would reduce biomass, but the claim about increasing global warming due to fossil fuels is not a support for reducing deforestation.
• Option C: Trees take in CO₂ during photosynthesis. Burning trees releases CO₂. So reducing deforestation means fewer trees are burned, reducing CO₂ in the atmosphere, which supports reducing deforestation.
• Option D: Claiming air quality and global warming effects don't change with deforestation reduction is wrong, as trees affect CO₂ levels.

• Option A: The passage says petroleum (cheaper) led to biofuel decline, so peanut oil (biofuel) was likely less cost - effective initially, but now with biofuel resurgence for cost (like ethanol preventing gasoline cost rise), but for peanut oil, "less cost" can be an advantage as biofuels (including peanut oil - based) are alternatives to costly petroleum.
• Option B: Biofuels like peanut oil produce less air pollution than fossil fuels, so this is an advantage.
• Option C: The passage doesn't mention peanut oil being easily replenished.
• Option D: Increasing CO₂ is a disadvantage, not an advantage.
• Option E: Increase in global warming is a disadvantage, not an advantage.

• Option A: Solar cookers generally have longer cooking times than conventional cookers, so this is not an advantage.
• Option B: Solar cookers depend on sunlight, so they can't cook in all weather (e.g., cloudy, rainy), so this is not an advantage.
• Option C: Solar cookers usually have limited capacity for large meals, so this is not an advantage.
• Option D: Solar cookers use solar energy and don't emit harmful gases, which is a major advantage.

Answer:

C. Trees use carbon dioxide in the process of photosynthesis, which reduces $\boldsymbol{CO_2}$ in the atmosphere. Burning huge masses of trees releases large amounts of $\boldsymbol{CO_2}$. Reducing deforestation lessens the amount of carbon dioxide in the atmosphere.

Question 8