In this second example, the candidate was using more advanced vocabulary (e.g. humid, tend to, exchange.) This is one reason why the mark would be higher. However, the main reason the Band score is high is because the candidate used a 2-step process to answer the questions.
Let's explain what this means. The candidate said:
It's generally hot and humid, although it rains heavily in October. This has a big influence on our way of life and our industries because work tends to stop in the rainy season.
Here the candidate describes the climate and then gives a second, more general piece of information about the climate, telling us about its influence.
The main industry is the production of cars and buses, which are mostly exported. Plastic items, especially toys , are important exports as well. In fact, we tend to export most of the products that we manufacture.
Here, the candidate does something similar: he answers the question and then gives a second, more general piece of information, showing that he has thought about the nature of his country's industries.
He does the same thing in the answer to the third question about festivals, with a first piece of information (our principal festivals are religious . . . ) supported by a further comment (So, we need to plan these events carefully . . . ) showing that he understands the situation. This is what we call the 2-step process for Part 1.
This means that you give an initial piece of information, and then a ftuther, more general piece of information showing that you understand the situation or that you have considered the situation. The answers are roughly 3 sentences in length. You don't need to give more than 3 sentences for a Part 1 answer.