Directions: Read the Assertion (A) and Reason (R) carefully and choose the correct alternative. Assertion (A): People generally feel comfortable in a hot and humid climate. Reason (R): In a humid climate sweat evaporates faster from the skin, which cools the body more efficiently.

Introduction / Context:
This question is about human comfort in different weather conditions and the role of humidity in the evaporation of sweat. It uses an Assertion and Reason format to test understanding of why people feel more or less comfortable in hot and humid climates. The key scientific idea is that evaporation of sweat from the skin removes heat from the body, and this process is strongly affected by the moisture content of the surrounding air.

Given Data / Assumptions:

• Assertion (A) states that people feel comfortable in hot and humid climate.
• Reason (R) states that in a humid climate sweat evaporates faster from the skin.
• Humidity refers to the amount of water vapour present in the air.
• We assume typical summer conditions where sweating is a major cooling mechanism for the body.

Concept / Approach:
When sweat evaporates from the surface of the skin, it absorbs latent heat from the body, which produces a cooling effect. The rate of evaporation depends on temperature, air movement, and humidity. If the surrounding air already contains a lot of water vapour, evaporation slows down. Slower evaporation means less cooling, which leads to discomfort. Therefore, hot and humid climates are usually more uncomfortable than hot and dry climates, the exact opposite of what the Assertion claims.

Step-by-Step Solution:
Step 1: In hot weather the human body regulates temperature partly by sweating. The sweat must evaporate for cooling to be effective. Step 2: In a hot and dry climate, the air contains little water vapour, so it can accept more moisture. This allows sweat to evaporate quickly, giving better cooling and relatively more comfort. Step 3: In a hot and humid climate, the air already contains a lot of water vapour. This reduces the capacity of the air to take up additional moisture from sweat. Step 4: Because of high humidity, sweat evaporates slowly, leaves a sticky feeling on the skin, and cooling becomes inefficient. People feel more tired and uncomfortable under such conditions. Step 5: Therefore Assertion (A), which claims that we feel comfortable in hot and humid climate, is false. Step 6: Reason (R) states that sweat evaporates faster in humid climate. This contradicts the scientific understanding just discussed. In reality, sweat evaporates more slowly when humidity is high, so Reason (R) is also false.

Verification / Alternative check:
Practical experience supports this analysis. Places with hot and sticky weather, such as coastal regions during monsoon, are often described as uncomfortable. In contrast, hot but dry desert climates may feel more tolerable in shade because sweat evaporation is more efficient. Science textbooks explicitly connect slower evaporation with high humidity and discomfort, confirming that both the Assertion and the Reason in the question are incorrect.

Why Other Options Are Wrong:
Any option treating either the Assertion or Reason as true conflicts with both scientific reasoning and everyday experience. Since both statements are wrong, options claiming truth or correct explanation cannot be accepted.

Common Pitfalls:
Some learners mix up the roles of temperature and humidity, assuming that high humidity always feels cooler simply because of cloud cover or rain. However, when both temperature and humidity are high, the body struggles to cool itself through evaporation, which is exactly why the climate becomes oppressive.

Final Answer:
Both Assertion (A) and Reason (R) are false, so the correct option is Both Assertion (A) and Reason (R) are false.