Test: Ecosystem - 3 - Class 5 MCQ

A desert is a very dry and a very hot place as there is very less rainfall there.

In spite of being a huge animal, an elephant loves eating bananas and leaves, and thus is a herbivore.

When any portion of a food chain is broken, all organisms in the chain are affected.

Grass → Grasshopper → Lizard → Eagle

In this chain:

• Grass is eaten by the grasshopper.
• The grasshopper is eaten by the lizard.
• The lizard is then eaten by the eagle.

Both these statements are false. Climatic conditions are not same in all the biomes. No two biomes have the same climatic conditions, besets are very hot whereas tundra region is very cold. Throughout the world/ there exist only 6 biomes that are divided across the countries. It is not true that all countries have their own 6 biomes.

Food chains and food webs are not synonyms. Food webs are the cluster of many complex food chains. Food chains are a part of food web.

To complete the food chain, we need to identify the organism that feeds on grasshoppers and is subsequently eaten by snakes.
The correct option is D: Frog. Here is the complete food chain:
- Plant: The food chain starts with plants, which are the primary producers. They use sunlight to produce food through photosynthesis.
- Grasshopper: Grasshoppers are herbivores that feed on plants, specifically on grass.
- Frog: Frogs are carnivores that feed on grasshoppers. They are secondary consumers in the food chain.
- Snake: Snakes are also carnivores and they feed on frogs. They are tertiary consumers in the food chain.
Summary: The complete food chain is as follows: Plant → Grasshopper → Frog → Snake.

Living things get energy by eating. Different living beings attain energy from different foods. For example a herbivore animal such as a cow gets energy by eating grass whereas a tiger gets energy by eating meat.

 The correct order is Flower → Caterpillar → Bird. Flower is the producer here. Caterpillar sucks the nectar from the flowers and is thus the primary consumer. Bird eats a caterpillar and thus it is a secondary consumer.

Plants use light (from sun) + carbon dioxide (from air) + water (from soil) to produce food. The process is called photosynthesis.

The producers are the plants and they are called so because they are responsible for producing food and oxygen for animals which they do by the process of photosynthesis.

"X" is the secondary consumer who eats the herbivore or the primary consumer. These are eaten by the tertiary consumers.

Snakes help control pests like rats, which can harm wheat crops. By killing snakes, he disrupts the natural balance, which may lead to more pests and damage to his farm. Snakes are important for keeping the ecosystem healthy

 None of these are the part of ecosystem.

Algae produces oxygen for water system and provides food for microscopic animal.

All living organisms get oxygen and carbon-dioxide from atmosphere.

Factors affecting desert ecosystems:

• Rainfall: Deserts are located in regions that receive very little rainfall, which is a crucial factor in determining the presence of desert ecosystems.


• Humidity: Due to extremely low humidity levels, desert ecosystems have limited water availability.


• Air pressure: While air pressure can affect weather patterns, it is not directly related to the presence of desert ecosystems.


• Water vapors: Although water vapors contribute to the overall humidity levels, they are not the primary determining factor for the presence of desert ecosystems.

Therefore, the correct answer is option D: rainfall. Desert ecosystems are located in regions that receive very less rainfall, resulting in low water availability and intense aridity.

 

The correct answer to fill in the blank is "temperature".
Explanation:
Desert ecosystems are characterized by specific environmental conditions that contribute to the sparse distribution of fauna and flora. Here's an explanation of each option and why "temperature" is the correct answer:
1. Temperature: Deserts are known for their extreme temperatures, with scorching hot days and freezing cold nights. These temperature variations create a challenging environment for organisms to survive.
2. Pressure: While atmospheric pressure does play a role in weather patterns, it is not a primary factor in determining the characteristics of desert ecosystems.
3. Volume: The volume of what is not specified in the sentence, so it cannot be determined if it is relevant to desert ecosystems.
4. Velocity: Velocity typically refers to the speed of an object in motion. It is not directly related to the characteristics of desert ecosystems.
In summary, the correct answer to fill in the blank is "temperature" because it accurately reflects the extreme thermal conditions present in desert regions.

Desert ecosystems exist in areas with very little rainfall. They have extremely high temperatures, low water availability, and strong sunlight. Because of these harsh conditions, plants and animals are few and not well-developed.

Therefore, the correct answer is C: Sunlight.

Reasons to convince Roman not to cover the garden:
1. Fencing is good enough to stop animals from entering the garden:
- Fencing can effectively keep animals out and protect the plants.
- It is a less intrusive method compared to covering the entire garden with a shed.
2. Plants need fresh air and sunlight to produce their food:
- By covering the garden, the plants will be deprived of sunlight, which is essential for photosynthesis.
- Without sunlight, the plants will not be able to produce food and will eventually die.
3. Plants are the producers of the ecosystem:
- Plants play a crucial role in the ecosystem as they are the primary producers.
- They convert sunlight and carbon dioxide into oxygen and food, supporting other organisms in the food chain.
- If the plants die, the entire ecosystem will be disturbed, affecting the animals and birds that rely on the plants for food and shelter.
Conclusion:
- It is best not to cover the garden completely with a shed to allow the plants to thrive.
- Fencing can provide adequate protection while still allowing the plants to receive sunlight and maintain a healthy ecosystem.