The correct option is
B. desert.
Detailed Explanation:
- Understanding the Characteristics:
- Low Annual Rainfall: Deserts typically receive less than 250 mm (10 inches) of rain per year. This scarcity of water is a defining feature of desert ecosystems.
- Sparse Vegetation: Due to the low rainfall, vegetation in deserts is limited. Plants that do grow are often specially adapted to conserve water, such as cacti and succulents.
- High Diurnal Temperatures: Deserts often experience extreme temperature variations between day and night. During the day, temperatures can soar due to direct sunlight, while at night, they can drop significantly because of the lack of moisture in the air to retain heat.
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Cold Nights: The absence of cloud cover in deserts allows heat to escape into the atmosphere at night, leading to much cooler temperatures after sunset.
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Why Option B is Correct:
- All the characteristics listed in the question align perfectly with the typical environment of a desert. The combination of low rainfall, sparse vegetation, and significant temperature fluctuations is a hallmark of desert climates.
Why the Other Options are Incorrect:
- A. Tropical Rainforest:
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Tropical rainforests are characterized by high annual rainfall (often exceeding 2000 mm), dense vegetation, and relatively stable temperatures throughout the year. They do not have the extreme temperature variations or low rainfall typical of deserts.
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C. Montane Forest:
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Montane forests, found in mountainous regions, typically have moderate to high rainfall and a variety of vegetation types. They also experience cooler temperatures but do not exhibit the extreme diurnal temperature changes or low rainfall characteristic of deserts.
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D. Guinea Savanna:
- The Guinea savanna is a type of grassland that experiences a seasonal climate with a distinct wet and dry season. While it has some sparse vegetation, it still receives more rainfall than deserts and does not have the extreme temperature variations seen in desert environments.
Summary of Key Points:
- Deserts are defined by low rainfall, sparse vegetation, and extreme temperature fluctuations.
- The characteristics of low annual rainfall and cold nights are not found in tropical rainforests, montane forests, or guinea savannas.
- Understanding the specific environmental conditions of each biome is crucial for identifying them correctly.
Revision Summary:
- Deserts have low rainfall (<250 mm/year) and sparse vegetation.
- They experience high daytime temperatures and cold nights due to lack of moisture.
- Other biomes like tropical rainforests and montane forests have different climatic conditions.
- Recognizing the unique features of each biome helps in accurately answering related questions.