Olympiad Test : Ecosystem - 1 - Class 5 MCQ

Consumers get their energy by consuming other things such as plants and animals. Plants are the only producers whereas all others are consumers or decomposers.

Overview:
Evergreen forests are characterized by their dense vegetation and the presence of green foliage throughout the year. These forests are typically found in regions with high rainfall and humidity. In India, evergreen forests can be found in various locations, including the Western Ghats, North Eastern India, and the Andaman and Nicobar Islands.
Details:
Here is a detailed explanation of each option:
A: Rainfall areas of the Western Ghats:
- The Western Ghats, a mountain range along the western coast of India, receives heavy rainfall due to the southwest monsoon.
- This region is known for its lush evergreen forests, which are home to a wide variety of flora and fauna.
- The high rainfall and favorable climatic conditions make it an ideal habitat for evergreen forests.
B: Rainfall areas of North Eastern India:
- The northeastern states of India, including Assam, Meghalaya, Nagaland, and Mizoram, receive abundant rainfall throughout the year.
- These regions are known for their dense evergreen forests, which are rich in biodiversity.
- The high rainfall, coupled with the hilly terrain, creates a favorable environment for the growth of evergreen vegetation.
C: Rainfall areas of Andaman and Nicobar Islands:
- The Andaman and Nicobar Islands, located in the Bay of Bengal, experience a tropical rainforest climate with high humidity and rainfall.
- These islands are home to some of the most pristine and diverse evergreen forests in the country.
- The combination of ample rainfall, fertile soil, and a warm climate supports the growth of lush evergreen vegetation.
D: All of the above:
- All the options mentioned above, i.e., the rainfall areas of the Western Ghats, North Eastern India, and the Andaman and Nicobar Islands, are known for their evergreen forests.
- These regions share common characteristics such as high rainfall, favorable climatic conditions, and suitable topography, which contribute to the growth and maintenance of evergreen vegetation.
In conclusion, evergreen forests are found in the high rainfall areas of the Western Ghats, North Eastern India, and the Andaman and Nicobar Islands. These regions have the necessary environmental factors to support the growth of dense evergreen vegetation.

Carnivores are the part of food chains that are meat eaters.

To determine the largest unit of the biological system, we need to understand the hierarchy of biological organization. The biological system is organized in a hierarchical manner, with smaller units combining to form larger ones.
The options provided are:
A: Population
B: Biome
C: Biosphere
D: Ecosystem
To identify the largest unit, let's examine each option:
A: Population
- A population refers to a group of individuals of the same species living in the same area and interacting with one another. It is a smaller unit within a larger system.
B: Biome
- A biome refers to a large geographical area characterized by specific climate conditions and the presence of distinct plant and animal communities. While biomes are larger than populations, they are not the largest unit in the biological system.
C: Biosphere
- The biosphere represents the sum of all ecosystems on Earth. It includes all living organisms, their interactions, and the physical environment. The biosphere encompasses the entire planet and is the largest unit of the biological system.
D: Ecosystem
- An ecosystem refers to a community of organisms interacting with one another and their physical environment. It includes both living (biotic) and non-living (abiotic) components. While ecosystems are significant units, they are smaller than the biosphere.
Therefore, the correct answer is C: Biosphere. It encompasses all other units and represents the largest unit of the biological system.

Savanna and Prairies are the types of grassland ecosystems.

The nutrients present in plants and animals are recycled through a process involving various organisms. One key group of organisms that play a crucial role in this nutrient recycling process are decomposers.

Decomposers:
- Decomposers are organisms that break down dead organic matter, such as dead plants and animals, into simpler substances.
- They include bacteria, fungi, and other microorganisms.
- Decomposers obtain energy and nutrients by breaking down the organic matter, releasing nutrients back into the environment.
Nutrient Recycling Process:
1. Producers: Plants, also known as producers, play a vital role in nutrient recycling. They absorb nutrients from the soil and use them for growth and development.
2. Consumers: Animals, including herbivores and carnivores, consume plants and other animals for energy and nutrients. They obtain nutrients from the consumed organisms.
3. Decomposers: When plants and animals die, decomposers break down their remains. This process releases the nutrients stored in the organic matter.
4. Nutrient Release: Decomposers release the nutrients back into the environment in a form that can be absorbed by plants. These nutrients become available for the growth of new plants.
5. Nutrient Uptake: Producers, such as plants, absorb the released nutrients from the soil, completing the nutrient recycling cycle.
Importance of Decomposers:
- Decomposers play a crucial role in nutrient cycling and maintaining the balance of ecosystems.
- They recycle nutrients back into the environment, making them available for plants and other organisms.
- Without decomposers, nutrients would remain locked in dead organic matter, preventing their reuse by living organisms.
In conclusion, decomposers are essential for the recycling of nutrients in plants and animals. They break down dead organic matter and release nutrients back into the environment, allowing producers to absorb and utilize them for growth and development.

Consumers in the Chain:

• Rabbit


• Snake


• Eagle

Explanation:

• In a food chain, the term "consumer" refers to organisms that obtain energy by consuming other organisms.


• In the given chain, the rabbit, snake, and eagle are all consumers because they obtain energy by consuming other organisms.


• The rabbit consumes plants, making it a consumer.


• The snake consumes the rabbit, making it a consumer as well.


• The eagle consumes the snake, making it a consumer too.

Therefore, the correct answer is option C: Rabbit, Snake, and Eagle.

When we destroy a forest, we primarily destroy a Biome. Here's a detailed explanation:
What is a forest?
A forest is a large area of land covered with trees, plants, and various types of wildlife. It is a complex and interconnected ecosystem that supports a wide range of life forms.
What is a biome?
A biome is a large geographical area characterized by distinct climate, vegetation, and animal life. It encompasses different ecosystems within its boundaries. Forests are one of the major types of biomes on Earth.
Why is destroying a forest equivalent to destroying a biome?
When we destroy a forest, we disrupt the entire ecosystem and significantly alter the natural balance within the biome. This has several negative impacts:
1. Loss of biodiversity: Forests are home to a wide variety of plant and animal species, many of which are endemic and cannot survive elsewhere. Destroying a forest leads to the extinction or displacement of these species, causing a loss of biodiversity.
2. Habitat destruction: Forests provide habitat for countless organisms, including insects, birds, mammals, and reptiles. By destroying the forest, we eliminate their homes and disrupt their natural habitat.
3. Disruption of ecosystem services: Forests play a crucial role in regulating climate, conserving water, preventing soil erosion, and purifying the air. When a forest is destroyed, these important ecosystem services are impaired or lost.
4. Negative impact on local communities: Forests provide livelihoods and sustenance for many indigenous and local communities. Destroying a forest not only affects their way of life but also deprives them of essential resources.
In conclusion, when we destroy a forest, we are not just eliminating trees and vegetation. We are disrupting an entire biome, causing irreparable damage to the delicate balance of nature and impacting the lives of numerous species and communities that depend on it.

A →3, B →4, C →1, D→2.

Primary consumers are organisms that feed directly on producers, which are typically plants or algae. They occupy the second trophic level in a food chain or food web.
In this case, the options provided are:
A: Cows and giraffes
B: Buffaloes and cats
C: Insects and butterflies
D: All of the above
To determine which set represents primary consumers, we need to consider the diet of each organism listed in the options.
A: Cows and giraffes
- Cows are herbivores and primarily feed on plants, making them primary consumers.
- Giraffes are also herbivores and feed on leaves, shoots, and fruits, classifying them as primary consumers.
B: Buffaloes and cats
- Buffaloes are herbivores that primarily consume grasses, making them primary consumers.
- Cats are carnivores that eat other animals, placing them in the secondary or tertiary consumer category.
C: Insects and butterflies
- Insects are a diverse group, but many of them are primary consumers. Examples include grasshoppers, beetles, and caterpillars.
- Butterflies are also primary consumers as they feed on nectar from flowers during their adult stage.
D: All of the above
- This option includes all the organisms listed in A, B, and C. Since all the organisms in A, B, and C are primary consumers, the answer is D.
Therefore, the correct answer is D: All of the above, as it includes cows, giraffes, buffaloes, cats, insects, and butterflies, all of which are primary consumers.