Question

The species diversity decreases from lower to higher altitudes on a mountain. This is due to
A. Increase in temperature
B. Decrease in temperature
C. Greater seasonal variability
D. Both B and C

Answer 1

Species diversity is determined by species richness and the species abundance.
The composition of species during a given scheme is the results of long-lasting evolution. Every species has custom-made to its own niche, that is characterized by sure options (e.g. temperature vary, availability of food or light) enabling the species to breed and so maintain its population.

Complete answer:
Biodiversity varies with a modification in altitude or latitude. The range will increase as we have a tendency to move from high to low altitudes (from poles to equator). Within the temperate region, the climate is severe with the short growing amount for plants whereas in tropical rain forests the conditions square measure favorable for growth throughout the year. This makes it potential for an oversized variety of species to occur and grow.
There’s a decrease in species diversity from lower to higher altitudes on a mountain. Decline in temperature and larger seasonal variability at higher altitudes square measure a significant issue that reduces diversity.

Hence, option (D) is the correct answer.

Note:- Species diversity is higher at the equator than at the poles.
The Antarctic continent has scarcely any species since its environment is so unpleasant.
In biological terms, this can be noted because the angular distance diversity gradient (LDG), within which the amount of species will increase from the poles to the Equator.
Higher temperatures, greater climate predictability, and longer developing seasons all plot to make the more welcoming natural surroundings, allowing a more prominent variety of species.
Tropical rainforests are the most extravagant habitat of all, tropical grasslands display more variety than temperate grasslands, and deserts in tropical or subtropical areas are populated by a more extensive scope of species than are temperate deserts.