Correct Option (d):
Equatorial forests, also known as tropical rainforests, exhibit several unique characteristics due to their location near the equator, characterized by high temperatures and abundant rainfall throughout the year. These include:
- Presence of tall, closely set trees whose crowns interlock to form a dense, continuous canopy. This canopy structure significantly reduces light penetration to the forest floor, creating distinct vertical strata.
- Exceptional biodiversity, leading to the coexistence of a large number of plant and animal species. Equatorial forests are among the most species-rich ecosystems globally, supporting a vast array of flora and fauna.
- Abundant presence of numerous varieties of epiphytes. These are plants, such as orchids, ferns, and mosses, that grow on other plants (typically trees) for support, thriving in the high humidity and multi-layered structure of the forest canopy.
Incorrect Options:
Options (a), (b), and (c) are incorrect because all three statements accurately describe distinct and unique characteristics of equatorial forests. Each feature contributes to the overall ecological profile of these ecosystems, and therefore, an option that excludes any of them would be an incomplete representation.