553 RAS Prelims practice MCQs on world geography are on this page, in 7 chapters. They cover physical landforms, major rivers and lakes, natural vegetation and biomes, world agriculture, industrial regions, the transport network and the main environmental issues: desertification, deforestation, climate change and ozone depletion. Each question has an answer and an explanation, in the formats the exam uses.
Practice questions based on the RPSC RAS Prelims syllabus. They follow the exam pattern but are not past-paper questions.
Showing 171–180 of 553 questions
Browse World Geography chapters
RAS PrelimsWorld Geography · Natural Vegetation and Biomes
Q171. Consider the following statements regarding Mangrove forests: I. They are found in tropical and subtropical intertidal regions. II. They exhibit vivipary, where seeds germinate while still attached to the parent tree. III. They possess pneumatophores which help them absorb oxygen directly from the air. IV. They thrive exclusively in highly acidic freshwater lakes. Which of the above statement(s) is/are correct?
Explanation
Mangroves are specialized coastal trees adapted to saline, intertidal environments. They utilize pneumatophores to access oxygen in waterlogged soils and exhibit vivipary, where seeds germinate while still attached to the parent. These forests are found in tropical and subtropical regions rather than freshwater lakes. Their unique roots provide stability against tides while filtering salt to ensure survival in harsh conditions.
RAS PrelimsWorld Geography · Natural Vegetation and Biomes
Q172. Temperate rainforests are found in limited coastal areas with high precipitation. Which of the following tree species is highly characteristic of the temperate rainforests of New Zealand?
Explanation
New Zealand’s temperate rainforests are unique ecosystems characterized by high precipitation and moderate temperatures throughout the year. Characteristic species include the iconic silver fern and the massive kauri tree, which is among the largest in the world. These forests also host a variety of mosses and liverworts, thriving in the consistently moist environment provided by the surrounding maritime climate.
RAS PrelimsWorld Geography · Natural Vegetation and Biomes
Q173. Match List I (Biome) with List II (Dominant Tree Species) and select the correct answer using the codes given below.
Biome
Dominant Tree Species
A. Tropical Deciduous
i. Pine and Spruce
B. Tropical Rainforest
ii. Teak and Sal
C. Boreal Forest
iii. Cork Oak and Olive
D. Mediterranean
iv. Mahogany and Rosewood Options:
Explanation
Different biomes are defined by their dominant tree species adapted to specific climates. Tropical deciduous forests feature teak and sal, while rainforests are known for mahogany and rosewood. Boreal forests consist mainly of conifers like pine and spruce. Mediterranean regions support drought-resistant trees such as cork oak and olive, which have thick bark and leathery leaves for protection against summer heat.
RAS PrelimsWorld Geography · Natural Vegetation and Biomes
Q174. The following question consists of two statements--Statement I and Statement II. Answer the question by selecting the appropriate option. Statement I: The Tundra biome is entirely devoid of deep-rooted trees due to the presence of permafrost beneath the soil surface. Statement II: Alpine Tundra is found at high altitudes on mountains across various latitudes, whereas Arctic Tundra is restricted to high northern latitudes.
Explanation
The tundra biome is characterized by extremely cold temperatures and a layer of permanently frozen soil called permafrost. This frozen ground prevents deep root penetration, effectively excluding large trees from the landscape. Arctic tundra is found at high latitudes, while alpine tundra occurs at high elevations on mountains globally. Both types share characteristics like low-growing vegetation, mosses, and hardy lichens.
RAS PrelimsWorld Geography · Natural Vegetation and Biomes
Q175. Consider the following statements regarding the ideal conditions for the growth of Coral Reefs: I. The water temperature should ideally be between 20 degrees Celsius and 27 degrees Celsius. II. They require clear, shallow water to allow sunlight penetration for photosynthesis. III. They thrive best in completely fresh water with zero salinity. IV. They require a hard substrate for the coral polyps to attach and build reefs. V. They flourish in areas with heavy sedimentation and muddy waters. Which of the above statement(s) is/are incorrect?
Explanation
Coral reefs require specific environmental conditions to flourish, including warm temperatures and clear, shallow water for sunlight penetration. They cannot survive in completely fresh water, as they need specific salinity levels for their physiological processes. Additionally, heavy sedimentation or muddy waters are harmful because they block sunlight and can smother the delicate coral polyps, hindering their growth and reef formation.
RAS PrelimsWorld Geography · Natural Vegetation and Biomes
Q176. In which of the following biomes is the soil formation process known as ‘podzolization’ most predominantly observed, resulting in acidic, ash-grey soils?
Explanation
Podzolization is a soil formation process characteristic of the cool, moist climates found in boreal forest or taiga biomes. The slow decomposition of coniferous needles produces organic acids that leach minerals from the upper soil horizons. This results in the formation of acidic, ash-grey soils known as podzols or spodosols, which are typically low in primary nutrients required for agriculture.
RAS PrelimsWorld Geography · Natural Vegetation and Biomes
Q177. Which of the following pairs of Biome and its corresponding climatic characteristic is correctly matched?
Explanation
Tropical rainforests are uniquely characterized by consistent environmental conditions, including high temperatures and abundant rainfall throughout the year. Unlike other biomes that experience distinct dry or cold seasons, rainforests maintain a stable climate that supports continuous plant growth and immense biodiversity. This lack of seasonality allows for complex ecological interactions and a highly stratified forest structure to develop over time.
RAS PrelimsWorld Geography · Natural Vegetation and Biomes
Q178. Which of the following represents the correct sequence of vegetation layers in a tropical rainforest, moving from the top of the canopy down to the ground?
Explanation
The vertical structure of a tropical rainforest is organized into layers based on sunlight availability. The emergent layer consists of the tallest trees that pierce the top canopy. Below this is the main canopy, a thick layer of foliage. The understory receives significantly less light and consists of smaller trees. Finally, the dark forest floor contains decaying matter and fungi.
RAS PrelimsWorld Geography · Natural Vegetation and Biomes
Q179. The following question consists of two statements--Assertion (A) and Reason (R). Answer the question by selecting the appropriate option. Assertion (A): Trees in the tropical savanna biome are usually widely spaced and often possess fire-resistant bark. Reason (R): The savanna ecosystem experiences frequent seasonal fires during the dry season, which inhibits the growth of a dense continuous forest canopy.
Explanation
Trees in the tropical savanna biome are adapted to survive a long dry season and frequent naturally occurring fires. Their fire-resistant bark and wide spacing prevent the development of a continuous canopy, allowing grasses to dominate the landscape. These adaptations are essential because seasonal fires clear undergrowth and prevent the encroachment of dense forest, maintaining the unique grassland-woodland mosaic structure.
RAS PrelimsWorld Geography · Natural Vegetation and Biomes
Q180. The tropical rainforest biome exhibits the highest terrestrial biodiversity. What is the primary climatic cause for this exceptional species richness?
Explanation
The exceptional species richness of tropical rainforests is primarily driven by a stable climate featuring year-round warmth and moisture. This consistency allows for continuous photosynthesis and reproduction, eliminating the need for dormancy. Such favorable conditions support complex ecological niches and intense competition, leading to high levels of specialization among both plant and animal species across the different forest layers.
Answer key for these questions
Q
Correct answer
171
(c) I, II and III
172
(b) Silver Fern and Kauri
173
(a) A-ii, B-iv, C-i, D-iii
174
(a) Both Statement I and Statement II are correct
175
(b) III and V only
176
(b) Boreal Forest (Taiga)
177
(b) Tropical Rainforest : Consistent high heat and rainfall throughout the year
(a) Both A and R are true and R is the correct explanation of A.
180
(d) Stable year-round warmth and moisture allowing continuous plant growth
Key facts from World Geography
The RPSC syllabus for world geography lists mountains, plateaus, plains and deserts, major rivers and lakes, natural vegetation, agriculture, industrial regions, transport and environmental issues.
Questions ask for the location of a feature: where a range lies, where a river ends, which country has an industrial region.
Statement and sequence questions are common, for example the order of mountain ranges or of vegetation layers.
Environmental issues are asked through treaties and dates, such as the Montreal Protocol, the IPCC and the Paris Agreement.
Indian and Rajasthan geography are on their own pages, each with its own chapters.
Frequently asked questions
How many RAS Prelims practice MCQs are there on World Geography?
This page has 553 practice MCQs on World Geography. Each has the correct answer, and most have an explanation.
Which chapters does the world geography set cover?
Seven chapters: physical landforms (mountains, plateaus, plains and deserts), major rivers and lakes, natural vegetation and biomes, world agriculture, major industrial regions, the world transport network, and environmental issues including desertification, deforestation, climate change and ozone depletion.
Is world geography part of the RAS Prelims syllabus?
Yes. The RPSC syllabus has a Geography of World and India section that lists physical aspects, rivers and lakes, natural vegetation, agriculture, industrial regions, transport and environmental issues for the world, followed by India and Rajasthan.
How can I revise world geography quickly?
Use an atlas alongside the questions. Attempt each chapter, read the explanation for every miss and mark the place on the map. Make short lists of ranges, rivers and industrial regions with their countries, and revise them over several days.
