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Environment & Ecology question from JKAS Prelims, 2021 by JKPSC

Liana density in tropical latitude is

1) A negative relationship with mean annual precipitation
2) A negative relationship with the length of the dry season period
3) A positive relationship with mean annual precipitation
 4) A positive relationship with the length of the dry season period

Choose the correct option.

Last updated May 15, 2026
Correct Answer: Option C — 1 and 4
Explanation
Lianas (woody vines) have unique physiological and structural adaptations that distinguish their distribution patterns from those of most tropical trees.

Statement 1 (Negative relationship with mean annual precipitation): Unlike trees, which generally increase in biomass and density as rainfall increases, liana density tends to decrease in extremely wet forests. In areas with very high annual rainfall, lianas are often outcompeted by the dense, fast-growing canopy of trees.

Statement 4 (Positive relationship with the length of the dry season): Lianas are highly efficient at transporting water and maintaining growth during dry periods. They have deep root systems and efficient vascular systems that allow them to thrive when trees might go dormant or struggle. Therefore, as the length of the dry season increases, the relative density and competitive advantage of lianas over trees also increase.
Answer verified by Quintessence Classes faculty — Karan Nagar, Srinagar.

About this question

JKPSC JKAS 2021 Prelims

Details

Exam JKPSC
Recruitment JKAS
Stage Prelims
Year 2021
Subject Environment & Ecology
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