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All questions of Ecology for BPSC (Bihar) Exam
Consider the following statements:
1. Population is a group of organisms occupying a defined area during a specific time.
2. Population growth rate is the percentage variation between the number of individuals in a population at two different places.
3. The main factors that make the population decrease are death and emigration.
Which of these statements is/are correct?
- a)1 and 2 Only
- b)2 and 3 Only
- c)1 Only
- d)1 and 3 Only
Correct answer is option 'D'. Can you explain this answer?
Consider the following statements:
1. Population is a group of organisms occupying a defined area during a specific time.
2. Population growth rate is the percentage variation between the number of individuals in a population at two different places.
3. The main factors that make the population decrease are death and emigration.
Which of these statements is/are correct?
a)
1 and 2 Only
b)
2 and 3 Only
c)
1 Only
d)
1 and 3 Only
|
Kavita Shah answered |
1 and 3 Only. Population is a group of organisms occupying a defined area during a specific time.
The main factors that make the population decrease are death and emigration.
Which biome is characterized by being the most productive agricultural areas of the earth, with trees like beech, oak, maple, and cherry in its flora?- a)Tundra
- b)Taiga
- c)Temperate Deciduous Forest
- d)Tropical rainforest
Correct answer is option 'C'. Can you explain this answer?
Which biome is characterized by being the most productive agricultural areas of the earth, with trees like beech, oak, maple, and cherry in its flora?
a)
Tundra
b)
Taiga
c)
Temperate Deciduous Forest
d)
Tropical rainforest
|
Tarun Mukherjee answered |
Temperate Deciduous Forest
The biome characterized by being the most productive agricultural areas of the earth, with trees like beech, oak, maple, and cherry in its flora, is the Temperate Deciduous Forest.
Characteristics of Temperate Deciduous Forest:
- This biome is found in regions with moderate climate and four distinct seasons.
- It is known for its rich soil, making it highly productive for agriculture.
- The flora includes a variety of deciduous trees such as beech, oak, maple, and cherry.
- These forests experience cold winters and warm summers, with a significant amount of rainfall throughout the year.
- The trees in this biome shed their leaves in the fall and regrow them in the spring, adapting to the changing seasons.
Importance of Temperate Deciduous Forest:
- These forests provide habitat for a diverse range of plant and animal species.
- They play a crucial role in regulating the climate by absorbing carbon dioxide and releasing oxygen through photosynthesis.
- The rich soil supports agriculture, making it one of the most productive areas for farming on Earth.
- These forests are also important for recreational activities, biodiversity conservation, and aesthetic value.
In conclusion, the Temperate Deciduous Forest biome stands out as the most productive agricultural areas on Earth, with its diverse flora and favorable climate conditions supporting abundant plant growth and agriculture.
The biome characterized by being the most productive agricultural areas of the earth, with trees like beech, oak, maple, and cherry in its flora, is the Temperate Deciduous Forest.
Characteristics of Temperate Deciduous Forest:
- This biome is found in regions with moderate climate and four distinct seasons.
- It is known for its rich soil, making it highly productive for agriculture.
- The flora includes a variety of deciduous trees such as beech, oak, maple, and cherry.
- These forests experience cold winters and warm summers, with a significant amount of rainfall throughout the year.
- The trees in this biome shed their leaves in the fall and regrow them in the spring, adapting to the changing seasons.
Importance of Temperate Deciduous Forest:
- These forests provide habitat for a diverse range of plant and animal species.
- They play a crucial role in regulating the climate by absorbing carbon dioxide and releasing oxygen through photosynthesis.
- The rich soil supports agriculture, making it one of the most productive areas for farming on Earth.
- These forests are also important for recreational activities, biodiversity conservation, and aesthetic value.
In conclusion, the Temperate Deciduous Forest biome stands out as the most productive agricultural areas on Earth, with its diverse flora and favorable climate conditions supporting abundant plant growth and agriculture.
Consider the following statements:
1. In the case of plants and animals the sun directly supplies the necessary energy.
2. Energy determines the distribution of organisms in the environment.
Which of these statements is/are correct?
- a)1 Only
- b)Both 1 and 2
- c)2 only
- d)Neither 1 nor 2
Correct answer is option 'B'. Can you explain this answer?
Consider the following statements:
1. In the case of plants and animals the sun directly supplies the necessary energy.
2. Energy determines the distribution of organisms in the environment.
Which of these statements is/are correct?
a)
1 Only
b)
Both 1 and 2
c)
2 only
d)
Neither 1 nor 2
|
Meera Singh answered |
Energy from the sun is essential for the maintenance of life. In the case of plants, the sun directly supplies the necessary energy. Since animals cannot use solar energy directly they obtain it indirectly by eating plants or animals or both. Energy determines the distribution of organisms in the environment.
Consider the following pairs:1. Herbivores : Primary consumers2. Wolves : Secondary consumers3. Algae : Primary producers4. Earthworm : Macro consumersHow many pairs given above are correctly matched?- a)Only one pair
- b)Only two pairs
- c)Only three pairs
- d)All four pairs
Correct answer is option 'C'. Can you explain this answer?
Consider the following pairs:
1. Herbivores : Primary consumers
2. Wolves : Secondary consumers
3. Algae : Primary producers
4. Earthworm : Macro consumers
How many pairs given above are correctly matched?
a)
Only one pair
b)
Only two pairs
c)
Only three pairs
d)
All four pairs
|
Rahul Pillai answered |
Understanding the Pairs
In ecology, organisms are classified based on their roles in the food chain. Let’s analyze each pair to determine their correctness.
1. Herbivores : Primary Consumers
- This pair is correctly matched.
- Herbivores, like deer and rabbits, feed on plants and are classified as primary consumers in the food chain.
2. Wolves : Secondary Consumers
- This pair is also correctly matched.
- Wolves are carnivores that prey on herbivores, thus they are considered secondary consumers.
3. Algae : Primary Producers
- This pair is correctly matched as well.
- Algae perform photosynthesis and produce energy, making them primary producers in aquatic ecosystems.
4. Earthworm : Macro Consumers
- This pair is not correctly matched.
- Earthworms are decomposers or detritivores, breaking down organic matter rather than being classified as macro consumers, which typically refers to larger organisms that consume other organisms.
Conclusion
- Out of the four pairs, three are correctly matched:
- Herbivores are primary consumers.
- Wolves are secondary consumers.
- Algae are primary producers.
- Only the earthworm pair is incorrect.
Thus, the correct answer is option 'C': only three pairs are correctly matched.
In ecology, organisms are classified based on their roles in the food chain. Let’s analyze each pair to determine their correctness.
1. Herbivores : Primary Consumers
- This pair is correctly matched.
- Herbivores, like deer and rabbits, feed on plants and are classified as primary consumers in the food chain.
2. Wolves : Secondary Consumers
- This pair is also correctly matched.
- Wolves are carnivores that prey on herbivores, thus they are considered secondary consumers.
3. Algae : Primary Producers
- This pair is correctly matched as well.
- Algae perform photosynthesis and produce energy, making them primary producers in aquatic ecosystems.
4. Earthworm : Macro Consumers
- This pair is not correctly matched.
- Earthworms are decomposers or detritivores, breaking down organic matter rather than being classified as macro consumers, which typically refers to larger organisms that consume other organisms.
Conclusion
- Out of the four pairs, three are correctly matched:
- Herbivores are primary consumers.
- Wolves are secondary consumers.
- Algae are primary producers.
- Only the earthworm pair is incorrect.
Thus, the correct answer is option 'C': only three pairs are correctly matched.
Consider the following statements about the Structure of a community:1. A community may have one or several species.2. The environmental factors determine the characteristic of the community.Which of these statements is/are correct?- a) 1 Only
- b) 2 Only
- c) Both 1 and 2
- d) Neither 1 nor 2
Correct answer is option 'A'. Can you explain this answer?
Consider the following statements about the Structure of a community:
1. A community may have one or several species.
2. The environmental factors determine the characteristic of the community.
Which of these statements is/are correct?
a)
1 Only
b)
2 Only
c)
Both 1 and 2
d)
Neither 1 nor 2
|
Partho Goyal answered |
Community Structure
The structure of a community refers to the composition of its species and the interactions among them. The following statements describe the structure of a community:
1. A community may have one or several species: This statement is correct. A community is defined as a group of different populations of species living in a particular area and interacting with each other. A community can have one or several species, depending on the size of the area and the environmental conditions.
2. The environmental factors determine the characteristics of the community: This statement is incorrect. While environmental factors do play a crucial role in shaping the structure of a community, they do not determine all of its characteristics. The interactions among species also play a significant role in determining the characteristics of a community, such as its diversity, stability, and productivity.
Conclusion
In conclusion, statement 1 is correct because a community can have one or several species, depending on the environmental conditions. Statement 2 is incorrect because environmental factors are not the only determinants of community characteristics. The interactions among species also play a crucial role in shaping the structure of a community.
The structure of a community refers to the composition of its species and the interactions among them. The following statements describe the structure of a community:
1. A community may have one or several species: This statement is correct. A community is defined as a group of different populations of species living in a particular area and interacting with each other. A community can have one or several species, depending on the size of the area and the environmental conditions.
2. The environmental factors determine the characteristics of the community: This statement is incorrect. While environmental factors do play a crucial role in shaping the structure of a community, they do not determine all of its characteristics. The interactions among species also play a significant role in determining the characteristics of a community, such as its diversity, stability, and productivity.
Conclusion
In conclusion, statement 1 is correct because a community can have one or several species, depending on the environmental conditions. Statement 2 is incorrect because environmental factors are not the only determinants of community characteristics. The interactions among species also play a crucial role in shaping the structure of a community.
Consider the following statements:Statement-I:
The tropical rain forest covers about 7% of the earth's surface and 40% of the world’s plant and animal species.Statement-II:
Tropical rain forests have multiple stories of broad-leafed evergreen tree species with most animals and epiphytic plants concentrated in the canopy or treetop zones.Which one of the following is correct in respect of the above statements?- a)Both Statement-I and Statement-II are correct and Statement-II explains Statement-I
- b)Both Statement-I and Statement-II are correct, but Statement-II does not explain Statement-I
- c)Statement-I is correct, but Statement-II is incorrect
- d)Statement-I is incorrect, but Statement-II is correct
Correct answer is option 'A'. Can you explain this answer?
Consider the following statements:
Statement-I:
The tropical rain forest covers about 7% of the earth's surface and 40% of the world’s plant and animal species.
The tropical rain forest covers about 7% of the earth's surface and 40% of the world’s plant and animal species.
Statement-II:
Tropical rain forests have multiple stories of broad-leafed evergreen tree species with most animals and epiphytic plants concentrated in the canopy or treetop zones.
Tropical rain forests have multiple stories of broad-leafed evergreen tree species with most animals and epiphytic plants concentrated in the canopy or treetop zones.
Which one of the following is correct in respect of the above statements?
a)
Both Statement-I and Statement-II are correct and Statement-II explains Statement-I
b)
Both Statement-I and Statement-II are correct, but Statement-II does not explain Statement-I
c)
Statement-I is correct, but Statement-II is incorrect
d)
Statement-I is incorrect, but Statement-II is correct
|
|
Poulomi Kumar answered |
Analysis of Statement-I
- Tropical rain forests indeed cover about 7% of the Earth's surface.
- They are biodiversity hotspots, housing around 40% of the world's plant and animal species, underscoring their ecological significance.
Analysis of Statement-II
- Tropical rain forests are characterized by multiple layers, including a dense canopy formed by broad-leafed evergreen trees.
- The canopy is crucial for biodiversity, as most animals and epiphytic plants thrive in this upper layer, benefiting from the abundant sunlight and nutrients.
Conclusion
- Both statements are accurate and provide complementary information about tropical rain forests.
- Statement-II elaborates on the structural characteristics of these forests, explaining how they support the vast biodiversity mentioned in Statement-I.
Correct Answer: Option A
- Therefore, the correct answer is that both Statement-I and Statement-II are correct, and Statement-II explains Statement-I. This relationship highlights the importance of the structural complexity of tropical rain forests in sustaining their rich biodiversity.
- Tropical rain forests indeed cover about 7% of the Earth's surface.
- They are biodiversity hotspots, housing around 40% of the world's plant and animal species, underscoring their ecological significance.
Analysis of Statement-II
- Tropical rain forests are characterized by multiple layers, including a dense canopy formed by broad-leafed evergreen trees.
- The canopy is crucial for biodiversity, as most animals and epiphytic plants thrive in this upper layer, benefiting from the abundant sunlight and nutrients.
Conclusion
- Both statements are accurate and provide complementary information about tropical rain forests.
- Statement-II elaborates on the structural characteristics of these forests, explaining how they support the vast biodiversity mentioned in Statement-I.
Correct Answer: Option A
- Therefore, the correct answer is that both Statement-I and Statement-II are correct, and Statement-II explains Statement-I. This relationship highlights the importance of the structural complexity of tropical rain forests in sustaining their rich biodiversity.
Consider the following statements regarding one of the major geochemical cycles, the water cycle:
1. Precipitation that falls near the equator is most likely to fall as rain into the ocean.
2. Water vapor is a greenhouse gas that helps to regulate the temperature of the earth's atmosphere.
3. Globally, precipitation far exceeds evaporation.
Which of the above statements is/are correct?
- a)1 and 2 only
- b)2 only
- c)1, 2 and 3
- d)1 and 3 only
Correct answer is option 'A'. Can you explain this answer?
Consider the following statements regarding one of the major geochemical cycles, the water cycle:
1. Precipitation that falls near the equator is most likely to fall as rain into the ocean.
2. Water vapor is a greenhouse gas that helps to regulate the temperature of the earth's atmosphere.
3. Globally, precipitation far exceeds evaporation.
Which of the above statements is/are correct?
a)
1 and 2 only
b)
2 only
c)
1, 2 and 3
d)
1 and 3 only
|
Meera Saha answered |
Statement 1: Precipitation near the equator falls as rain into the ocean.
This statement is correct. Near the equator, the climate is generally warm and humid. As warm, moist air rises, it cools and condenses, forming clouds. These clouds then produce heavy rainfall. Since the equator is surrounded by vast oceans, a significant portion of the precipitation falls directly into the ocean.
Statement 2: Water vapor is a greenhouse gas that helps regulate the temperature of the Earth's atmosphere.
This statement is also correct. Water vapor is the most abundant greenhouse gas in the Earth's atmosphere. It plays a crucial role in regulating the Earth's temperature through the greenhouse effect. Water vapor absorbs and re-emits heat radiated from the Earth's surface, trapping it in the atmosphere. This process helps to maintain the Earth's temperature within a suitable range for supporting life.
Statement 3: Globally, precipitation far exceeds evaporation.
This statement is incorrect. The water cycle involves the continuous movement of water between the Earth's surface, atmosphere, and back. Precipitation refers to the process of water falling from the atmosphere to the Earth's surface, while evaporation refers to the process of water changing from a liquid to a vapor and returning to the atmosphere.
Globally, evaporation and precipitation are generally balanced, forming a cycle. The amount of water evaporating from the Earth's surface is approximately equal to the amount of water returning as precipitation. Therefore, the statement that precipitation far exceeds evaporation is not accurate.
Conclusion:
Based on the analysis, the correct statements are:
1. Precipitation that falls near the equator is most likely to fall as rain into the ocean.
2. Water vapor is a greenhouse gas that helps to regulate the temperature of the Earth's atmosphere.
Chapter doubts & questions for Ecology - Environment & Additional Topics for State PSC Exams 2025 is part of BPSC (Bihar) exam preparation. The chapters have been prepared according to the BPSC (Bihar) exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for BPSC (Bihar) 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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