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Q84 (CAPF/2021) Geography › World Physical Geography › Natural vegetation biomes Answer Verified

Which of the following statements about tropical rainforests are correct? 1. The soils of tropical rainforests are ite infertile. 2. The vegetation is evergreen, enabling photosynthesis to take place year around. 3. They have been described as 'deserts covered by trees'. 4. They are the most productive land-based ecosystem. Select the correct answer using the code given below.

Result
Your answer: —  Â·  Correct: D
Explanation

Tropical rainforests are characterized by highly weathered, acidic, and nutrient-poor soils, primarily Oxisols and Ultisols [1]. Despite the lush vegetation, the soil is infertile because heavy rainfall causes intense leaching, and nutrients are rapidly recycled into biomass rather than stored in the soil [2]. This paradox leads to the description of these forests as 'deserts covered by trees'—a system where the soil itself cannot support agriculture once the biomass is removed. The vegetation is evergreen, with a year-round growing season that allows continuous photosynthesis due to uniform high temperatures and moisture [3]. Furthermore, tropical rainforests are the most productive land-based ecosystems, contributing approximately one-third of the Earth's total terrestrial net primary productivity (NPP) [3]. All four statements are scientifically accurate descriptions of this biome's ecological and pedological characteristics.

Sources

  1. [1] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 3: Terrestrial Ecosystems > 3.2.5. Tropical rain forests: > p. 25
  2. [2] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 3: MAJOR BIOMES > 1. Tropical Evergreen Rainforest Biome > p. 5
  3. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 30: Climatic Regions > Equatorial Vegetation > p. 426
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SIMILAR QUESTIONS

IAS · 2023 · Q63 Relevance score: 3.58

Consider the following statements : Statement-I : The soil in tropical rain forests is rich in nutrients. Statement-II : The high temperature and moisture of tropical rain forests cause dead organic matter in the soil to decompose quickly. Which one of the following is correct in respect of the above statements?

NDA-I · 2015 · Q50 Relevance score: 2.34

The luxuriant growth of natural vegeta- tion in tropical rainforest is due to 1. fertile soil. 2. hot and wet climate throughout the year. 3. intense sunlight for photosynthesis. 4. seasonal change to facilitate nutrient absorption. Select the correct answer using the code given below :

CDS-I · 2017 · Q37 Relevance score: 1.59

Tropical evergreen rain forest biome provides optimum environmental conditions for the growth of plants and animals. Which one among the following statements regarding this is not correct?

NDA-I · 2011 · Q59 Relevance score: 1.49

Consider the following statements : 1. The Himalayan vegetation varies according to both altitude and climatic conditions. 2. There are mainly two types of tropical forests that are found in the Himalayas—the tropical rainforests and the tropical deciduous forests Which of the statements given above is/are correct ?

NDA-II · 2014 · Q8 Relevance score: 1.20

Which of the following statements is/are correct? 1. The tropical cyclones of China Sea are called typhoons. 2. The tropical cyclones of the West Indies are called tornadoes. 3. The tropical cyclones of Australia are called willy- willies. 4. Formation of an anticyclone results in stormy weather condition. Select the correct answer using the code given below.