Search Previous Year Questions

The correct answer is 'J-shaped curve'

Key Points 

J-shaped curve:

• The J-shaped curve represents exponential growth, where the population size increases at a constant rate per time period, leading to a steep rise.
• This pattern is observed in human population growth, particularly in recent centuries due to advances in medicine, agriculture, and technology.
• The curve initially shows a slow growth phase (lag phase), followed by a rapid acceleration (exponential phase), creating a J-shape.

Additional Information

• Horizontal line:
• A horizontal line indicates zero population growth, meaning the population size remains constant over time.
• This does not accurately represent human population growth, which has shown significant increases over time.
• L-shaped curve:
• An L-shaped curve typically represents a sharp decline to a stable low level, not applicable to human population growth.
• Human population has not experienced such a dramatic and sustained decrease.
• Parabola curve:
• A parabolic curve shows a symmetrical rise and fall, resembling an arch.
• Human population growth does not follow this pattern as it lacks the decline phase that would complete the parabolic shape.

The correct answer is 'Decomposer'.

Key Points

• Decomposer:
• Decomposers, also known as detritivores, are organisms that break down dead plant and animal matter, recycling nutrients back into the ecosystem.
• They play a crucial role in maintaining the balance of ecosystems by ensuring the decomposition of organic materials.
• Common examples of decomposers include bacteria, fungi, and certain insects like earthworms.

Additional Information

• Herbivores:
• Herbivores are animals that primarily eat plants, leaves, fruits, and seeds.
• They are an essential part of the food chain, acting as primary consumers that transfer energy from plants to higher trophic levels.
• Examples include cows, deer, and rabbits.
• Carnivores:
• Carnivores are animals that primarily consume other animals.
• They are secondary or tertiary consumers in the food chain, helping control the population of herbivores and other prey.
• Examples include lions, eagles, and sharks.
• Omnivores:
• Omnivores are animals that have a diet consisting of both plant and animal matter.
• They can adapt to different food sources based on availability, making them highly versatile.
• Examples include humans, bears, and pigs.

The correct answer is 'Demography'

Key Points 

• Demography:
• Demography is the scientific study of human populations, primarily with respect to their size, structure, and development.
• It involves statistical analysis to understand population dynamics such as birth rates, death rates, aging, and migration patterns.
• Demographers use this data to predict future trends and to understand the implications for resources, healthcare, and policy-making.

Additional Information

• Heridity:
• Heredity refers to the genetic transmission of characteristics from parents to their offspring.
• Statistics:
• Statistics is the branch of mathematics dealing with data collection, analysis, interpretation, and presentation.
• Mobility:
• Mobility refers to the ability to move or be moved freely and easily.

The correct answer is 'Sea gull'.

Key Points

• Maximum deposition of DDT in Sea gulls:
• DDT (Dichloro-Diphenyl-Trichloroethane) is a pesticide that accumulates in the food chain through a process called biomagnification.
• Sea gulls are at the top of the aquatic food chain, feeding on fish and other marine organisms that have already accumulated DDT in their bodies.
• As a result, Sea gulls end up with the highest concentration of DDT due to the cumulative effect of eating contaminated prey.

Additional Information

• Phytoplankton:
• Phytoplankton are the primary producers in the aquatic food chain and are the first to absorb DDT from the water.
• However, they have the lowest concentration of DDT because they are at the bottom of the food chain.
• Crab:
• Crabs are intermediate consumers and feed on smaller organisms like plankton and detritus.
• They accumulate more DDT than phytoplankton but less than higher trophic levels such as eels and sea gulls.
• Eel:
• Eels are higher up in the food chain compared to crabs and phytoplankton, feeding on smaller fish and invertebrates.
• They have a higher DDT concentration than crabs but still less than sea gulls.

An EVS textbook is a tool to be used in the teaching-learning of EVS to facilitate effective learning. It supports children to construct knowledge through active participation.

Key Points

• The section on 'Do this and find out' in EVS (Environmental Studies) textbooks is designed to provide students with direct hands-on experience.
• The goal is to encourage active participation and experiential learning, where students can explore and understand concepts through observation, experiments, and real-world activities.
• This practical approach helps in developing critical thinking and problem-solving skills.

Therefore, the correct answer is providing direct hands on experience.

Diversity refers to the presence of a wide range of differences among people, including characteristics such as race, ethnicity, gender, age, religion, language, abilities, socioeconomic status, and more.

Key Points

• It is about recognizing and appreciating the uniqueness of individuals in terms of their culture, language, religion, ethnicity, and other characteristics.
• It promotes the idea that differences among people are valuable and should be embraced.
• Diversity encourages inclusiveness and understanding, fostering an environment where everyone is respected for their individuality.

Therefore, the correct interpretation of diversity is 'It accepts the uniqueness of the people'.

The correct answer is House boats.

Key Points

• A house boat is a type of floating house that is designed to be lived in and can be moved from one place to another.
• It is typically built on a floating platform or pontoons, allowing it to float on water.
• House boats can be found in different countries and are often used as permanent homes, vacation rentals, or tourist attractions.
• They are equipped with all the necessary amenities and can vary in size and design.

Additional Information

• House boats are popular in regions with large bodies of water such as lakes, rivers, and coastal areas.
• They provide a unique living experience and allow people to enjoy the serenity of being on the water.
• Some house boats are self-propelled, while others may require towing or external propulsion.
• They can offer stunning views, access to water activities, and a sense of freedom and adventure.

The correct answer is 'Tsunamis'.

Key Points 

• Tsunamis:
• Tsunamis are large ocean waves typically caused by underwater earthquakes, volcanic eruptions, or landslides.
• They are a type of natural hazard because they result from natural geological processes.
• Tsunamis can cause widespread destruction along coastlines, leading to loss of life, property damage, and environmental impacts.

Additional Information 

• Explosions:
• Explosions are typically human-made events, often resulting from industrial accidents, terrorism, or warfare.
• They do not qualify as natural hazards because they are not caused by natural processes.
• Leakage of toxic waste:
• The leakage of toxic waste is generally a result of human activities, such as industrial spills or improper waste disposal.
• Dam failure:
• Dam failures usually result from engineering flaws, maintenance issues, or extreme weather conditions.
• While they can lead to natural disasters like floods, the initial cause is typically human-related, making them technological hazards rather than natural hazards.

The correct answer is 'Over the Indian sub-continent, North Eastern part of South America and Northern Australia'

Key Points  Overview of Tropical Monsoon Climate:

• The tropical monsoon climate is characterized by heavy seasonal rainfall influenced by monsoon winds.
• This climate typically features a distinct wet season and dry season.
• Regions with this climate experience intense rainfall during the monsoon season and very little precipitation during the dry season.
• Regions with Tropical Monsoon Climate:
• Indian Sub-Continent: Major parts of India, Bangladesh, and neighbouring countries experience this climate, characterized by the southwest monsoon bringing heavy rains.
• North Eastern Part of South America: Parts of northern Brazil and the Guianas exhibit this climate, with significant seasonal rainfall variations.
• Northern Australia: The northern regions of Australia, particularly the Northern Territory and parts of Queensland, experience a tropical monsoon climate, marked by a wet season from November to April.

Additional Information

• North and South of the Amazon Forest in Brazil:
• This region primarily features a tropical rainforest climate rather than a monsoon climate, with consistent high rainfall throughout the year.
• Near Amazon Basin in South America, Western Equatorial Africa:
• These regions are predominantly characterized by a tropical rainforest climate, with no distinct dry season, thus differing from the tropical monsoon climate.
• Adjoining Parts of Bolivia and Paraguay in South America:
• These areas generally experience a tropical savanna climate or subtropical climate, with less pronounced monsoon influences compared to the tropical monsoon climate regions.

The correct answer is 'Drainage Basin'

Key Points

• Drainage Basin:
• A drainage basin, also known as a watershed, is an area of land where all precipitation collects and drains off into a common outlet, such as a river, bay, or other body of water.
• It is a geographical area that contributes runoff, sediments, and dissolved substances to a stream or river.
• Drainage basins play a crucial role in the hydrological cycle and are essential for water resource management, flood control, and ecosystem sustainability.

Additional Information

• Sewage Drainage System:
• This refers to infrastructure designed to carry sewage and waste water from homes and businesses to treatment facilities. It is not related to natural water collection and discharge.
• Watershed:
• While 'watershed' is often used interchangeably with 'drainage basin,' it can also refer to the highland or ridge that separates different drainage basins. Thus, it is a broader term but does not specifically denote the collection of all watersheds into one major body of water.
• Wetland:
• Wetlands are areas where water covers the soil or is present near the surface for varying periods of time during the year. They are important ecosystems but do not refer to the collection of watershed drainage.