Q.Explain the reasons for greater biodiversity in tropical regions compared to temperate regions.

[!TLDR] The tropics are more biodiverse due to long climatic stability, high solar energy/rainfall, greater habitat complexity, and faster speciation. …

[!ANSWER] Several interacting factors explain why tropical regions hold disproportionately high biodiversity compared with temperate regions.

First, tropical regions have experienced relatively stable climates over very long geological timescales, without the repeated ice-age glaciations that periodically wiped out or displaced species across large parts of the temperate and polar latitudes; this has given tropical lineages a much longer, continuous period of evolutionary time in which to diversify undisturbed.

Second, the tropics receive more consistent, higher-intensity solar energy and, typically, greater and more evenly distributed rainfall throughout the year. This supports much higher primary productivity (plant growth), which in turn can support and sustain a far larger number of consumer species up the food chain. …

• Giving only one reason (usually just "more rainfall") instead of the full combination of factors. …