Tropical plants have a higher temperature optimum than the plants adapted to temperate climates.

Explanation:
Tropical plants are those that are native to tropical regions, which typically have warm temperatures year-round. On the other hand, plants adapted to temperate climates are those that have evolved to withstand the seasonal temperature variations found in temperate regions.

1. Temperature Optimum:
The temperature optimum refers to the temperature range at which a plant's metabolic processes are most efficient. It is the temperature at which the plant can carry out its physiological functions optimally.

2. Tropical Plants:
Tropical plants have adapted to consistently warm temperatures and high levels of sunlight found in tropical regions. As a result, their temperature optimum tends to be higher compared to plants adapted to temperate climates. These plants are well-suited to thrive in temperatures ranging from 25-30°C (77-86°F).

3. Adaptation to Warmth:
Tropical plants have evolved various mechanisms to cope with the higher temperatures. They often have larger leaves with a higher surface area to absorb more sunlight for photosynthesis. Additionally, they may have specialized leaf structures to reduce water loss through transpiration, such as waxy coatings or smaller stomata. These adaptations allow them to efficiently capture and utilize sunlight and prevent excessive water loss in warm environments.

4. Plants Adapted to Temperate Climates:
Plants adapted to temperate climates are accustomed to more variable temperatures throughout the year, including colder winters and hotter summers. Their temperature optimum tends to be lower compared to tropical plants. These plants can tolerate a wider range of temperatures, typically between 15-25°C (59-77°F).

5. Adaptation to Seasonal Variation:
Plants in temperate climates have evolved mechanisms to survive the seasonal temperature changes. They may enter a period of dormancy during the winter months, shedding their leaves or going through a phase of reduced metabolic activity. In contrast, during the warmer months, they take advantage of the higher temperatures to carry out their growth and reproductive processes.

In conclusion, tropical plants have a higher temperature optimum compared to plants adapted to temperate climates. This is due to their adaptation to consistently warm temperatures and their ability to efficiently utilize sunlight and conserve water in tropical environments.