The provided image is a world map with several tasks related to geography. I will address each task based on the visual information and common geographical knowledge.
Based on the map, the largest country in South America by area is Brazil. Its capital is Brasília, which is marked on the map.
The largest country by area in North America is Canada. Its capital is Ottawa. While Ottawa is not explicitly marked with a unique symbol distinct from other cities, it is geographically located in the southern part of Canada.
The map indicates that task 5 requires the use of conditional signs (условные знаки) to denote agricultural cultures. However, the specific symbols for agricultural products are not provided in this particular crop of the image. In general, Southern Europe is known for olives, grapes, and wheat, while Southeast Asia is known for rice, tea, and tropical fruits.
Task 6 requires marking major tourist centers with an arbitrary conditional sign. This is a subjective task and would require specific points of interest to be identified on the map. Without further instructions on which centers to mark, this task cannot be completed with specific locations.
Note: Tasks 5 and 6 require additional information (conditional signs) or specific points of interest, which are not fully visible or provided in the given image crops.