SENAPREP
Ecology Questions
Chapter: Life Sciences | Total Available: 11 Real Questions
While travelling to a hilly region, you notice amassive boulder, whi ch was loosened by heavyrains and moved downhill. This has resulteddue to which of the following processes?
1. Mass wasting
2. Erosion
3. Weathering
Select the correct answer using the code givenbelow.
Correct Answer
📖 Governing Law / Core Concept
Mass wasting refers to the downhill movement of materials under the influence of gravity, while erosion is the process of transporting weathered materials, and weathering involves the breakdown of rocks and minerals.
🧪 Step-by-Step Breakdown
The scenario involves:
- Mass Wasting: The boulder moving downhill indicates mass wasting—gravity's pull on loosened materials.
- Erosion: Rain can exacerbate the loss of soil and rock materials, facilitating erosion.
- Weathering: Heavy rains contribute to the weathering process by breaking down rocks, making them prone to movement.
🔍 Option Analysis
- 1. Mass Wasting: Correct, it describes the movement of the boulder.
- 2. Erosion: Correct, as it relates to the removal of material.
- 3. Weathering: Correct, as it undermines the structural integrity of rocks.
⚡ Mnemonic / Speed-Run
Remember: Mass Wasting Weathering and Erosion - MWE combination leads to landscape change!
📊 Visual Suggestion
6. Visual Suggestion
A diagram illustrating the processes of mass wasting, erosion, and weathering in a hilly terrain—with arrows indicating movement and flow of water—can enhance understanding.
📖 Factual Verification & Reference
Verified against NCERT Class 11 Geography, Chapter 2: Landform Development and Processes.
Which one of the following is not a form of condensation?
Correct Answer
📖 Governing Law / Core Concept
Condensation is the process by which vapor transitions into liquid, typically occurring when temperature decreases or pressure increases. Common forms include dew, fog, and frost.
🧪 Step-by-Step Breakdown
1. **Dew** forms when moisture in the air condenses into droplets on cooler surfaces during the night.
2. **Fog** is a cloud of tiny water droplets that forms near the ground, resulting from condensation of water vapor when the air cools.
3. **Frost** occurs when condensation turns to ice, forming on surfaces when the temperature drops below freezing.
4. **Sleet**, however, consists of ice pellets formed from freezing rain and is not a result of condensation.
🔍 Option Analysis
Option A (Dew), Option B (Fog), and Option C (Frost) are all processes resulting from gas-to-liquid condensation, while Option D (Sleet) results from frozen precipitation.
⚡ Mnemonic / Speed-Run
Remember DFF: Dew, Fog, Frost are condensation forms; S is for Sleet, which is different.
6. Visual Suggestion
A flowchart illustrating the transition from vapor to dew, fog, and frost, emphasizing the temperature changes and humidity levels, while clearly distinguishing sleet at the bottom as a separate process.
📖 Factual Verification & Reference
Verified against NCERT Class IX Science, Chapter on Weather and Climate.
Which of the following statements with reference to soil forming processes is/arecorrect?
1. Translocation, enrichment, removal and transformation are different classes of soil forming processes
2. In translocation, fine particles are transported downward by eluviation and accumulate in lower horizons by illuviation
Select the answer using the code given below:
Correct Answer
📖 Governing Law / Core Concept
Soil-forming processes can be classified into four broad categories: translocation, enrichment, removal, and transformation.
🧪 Step-by-Step Breakdown
- Translocation: This process involves the vertical movement of soil materials. Fine particles are washed down from upper horizons (eluviation) and deposited in lower horizons (illuviation).
- Enrichment, Removal, Transformation: These processes contribute to the development and evolution of soil profiles by adding or redistributing nutrients and materials within the soil structure.
🔍 Option Analysis
Both statements support the classification of soil-forming processes correctly. Therefore, options 1 and 2 are valid, reaffirming that both processes exist and contribute significantly to soil development.
⚡ Mnemonic / Speed-Run
- Mnemonic for Soil Processes: "TRETS" - Translocation, Removal, Enrichment, Transformation, Soil
6. Visual Suggestion
6. Visual Suggestion
A flowchart depicting the soil formation process, showing how eluviation (upward movement) and illuviation (downward accumulation) correlate with translocation. Include arrows to illustrate the movement of particles and label each horizon of the soil profile for clarity.
📖 Factual Verification & Reference
Verified against NCERT Class XII Geography, Chapter on Soils.
Condensation of water vapour into water is influenced by which of the following factor/factors?
1. Volume of air
2. Humidity
3. Temperature
Select the answer using the code given below:
1. Correct Answer
Option D is correct. All three factors (Volume of air, Humidity, Temperature) influence the condensation of water vapor into water.
📖 Short Explanation
Condensation of water vapor occurs when air reaches saturation point, influenced by air volume, humidity (amount of water vapor present), and temperature (critical for reaching dew point).
💡 3. Why Correct Answer is Correct
Condensation is a process where water vapor transforms into liquid water when air is cooled or reaches saturation.
- Volume of Air: Larger volumes can accommodate more moisture but also influence pressure and temperature, both affecting condensation.
- Humidity: High humidity means air holds maximum water vapor, approaching saturation and triggering condensation.
- Temperature: Cooler temperatures mean air can hold less moisture, leading to dew point where condensation forms as liquid.
❌ 4. Why Other Options are Wrong
- •Option A: Ignores humidity and temperature, both critical for reaching the air's saturation point.
- •Option B: Ignores temperature, necessary for conversion of vapor to liquid by cooling air to its dew point.
- •Option C: Leaves out the influence of air volume on moisture capacity and pressure impacting condensation.
NDA Speed-Run / Mnemonic Shortcut
Use the mnemonic "VHT": Volume expands, Humidity saturates, Temperature cools. All three complete condensation.
5. Key Learning Point
Condensation depends on the interplay between air volume, humidity levels, and temperature, achieving saturation and dew point.
6. Visual Suggestion
Imagine a dynamic chart showing the relationship between volume, humidity, and temperature changes, indicating how each factor contributes to reaching the dew point for condensation.
Which of the following statements regarding humidity is/are correct?
1. It is a ratio between the actual amount of water vapour present in the atmosphere and the maximum amount it can hold at a given temperature.
2. When the relative humidity is high, more water evaporates from the skin.
3. Higher the air temperature lower the relative humidity of the air.
Select the answer using the code given below:
Correct Answer
📖 Governing Law / Core Concept
Humidity is defined as the amount of water vapor present in the air relative to the maximum amount the air can hold at a certain temperature. This is expressed as a percentage known as relative humidity.
🧪 Step-by-Step Breakdown
- Statement 1: Correct. It defines relative humidity accurately.
- Statement 2: Incorrect. High relative humidity reduces evaporation from the skin since the air is already saturated with moisture.
- Statement 3: Correct. As air temperature increases, the capacity to hold water vapor increases, thus reducing relative humidity.
🔍 Option Analysis
- Option A: Only includes Statement 1, which is correct.
- Option B: Incorrect due to Statement 2.
- Option D: Incorrect; includes Statement 2.
⚡ Mnemonic / Speed-Run
Remember: "Hot air holds more," which means as temperature rises, relative humidity can drop if moisture levels remain constant.
📖 Factual Verification & Reference
Verified against NCERT Class XI Environmental Science, Chapter on Weather and Climate.
Directions:Read the following passage carefully and answer the items based on it. You are required to select your answers based solely on the contents of the passage and the opinion of the author.The grouping or assemblage of plants, animals and microbes we observe when we study a natural forest, a grassland, a pond, a coral reef or some other undisturbed area, is referred to as the area's biota or biotic community. The plant portion of the biotic community includes all vegetation, from large trees down through to microscopic algae. Likewise, the animal portion includes everything from large mammals, birds, reptiles and amphibians through to earthworms, tiny insects and mites. Microbes encompass a large array of microscopic bacteria, fungi and protozoans. Thus, the biotic community comprises a plant community, an animal community and a microbial community.The particular kind of biotic community found in a given area is, in large part, determined by abiotic factors such as the amount of water or moisture present, the temperature, the salinity, or the type of soil in the area. These abiotic factors both support and limit the particular community. For example, a relative lack of available moisture prevents the growth of most species of plants, but supports certain species, such as cacti; these kinds of areas and a suitable temperature support forests. The presence of water is the major factor that sustains aquatic communities.The first step in investigating a biotic community may be simply to catalogue all the species present. Species are the different kinds of plants, animals and microbes in the community. A given species includes all those individuals which have a strong similarity in appearance to one another and which are distinct in appearance from other such groups. Each species in a biotic community is represented by a certain population - that is, by a certain number of individuals that make up the interbreeding, reproducing group.
44[Q] In the passage, the word ‘aquatic community’refers to:
Correct Answer
📖 Governing Law / Core Concept
A biotic community is defined by the interactions of organisms within a defined habitat, influenced by abiotic factors such as water availability, temperature, and soil type.
🧪 Step-by-Step Breakdown
In the passage, the term "aquatic community" specifically refers to organisms living in water, which include various species of fish, amphibians, and aquatic plants. This community is sustained primarily by abiotic factors such as:
- Water availability
- Temperature
- Salinity levels
These factors dictate the types of biotic communities that can exist in respective environments.
🔍 Option Analysis
- Option A: Biotic community inhabiting the land - Incorrect as it references terrestrial communities.
- Option C: Biotic community found in the air - Incorrect, pertains to aerial organisms.
- Option D: Assemblage of rain and moisture - Incorrect, does not define a biological community.
⚡ Mnemonic / Speed-Run
Remember “Aqua = Water” for aquatic communities and their reliance on surrounding water ecosystems.
6. Visual Suggestion
6. Visual Suggestion
A diagram depicting a cross-section of a pond ecosystem, labeling various aquatic organisms such as fish, water plants, and microbes, along with abiotic factors like water level and temperature, will enhance understanding of the aquatic community.
📖 Factual Verification & Reference
Verified against NCERT Class 11 Biology, Chapter 13 (Ecosystem).
Directions:Read the following passage carefully and answer the items based on it. You are required to select your answers based solely on the contents of the passage and the opinion of the author.The grouping or assemblage of plants, animals and microbes we observe when we study a natural forest, a grassland, a pond, a coral reef or some other undisturbed area, is referred to as the area's biota or biotic community. The plant portion of the biotic community includes all vegetation, from large trees down through to microscopic algae. Likewise, the animal portion includes everything from large mammals, birds, reptiles and amphibians through to earthworms, tiny insects and mites. Microbes encompass a large array of microscopic bacteria, fungi and protozoans. Thus, the biotic community comprises a plant community, an animal community and a microbial community.The particular kind of biotic community found in a given area is, in large part, determined by abiotic factors such as the amount of water or moisture present, the temperature, the salinity, or the type of soil in the area. These abiotic factors both support and limit the particular community. For example, a relative lack of available moisture prevents the growth of most species of plants, but supports certain species, such as cacti; these kinds of areas and a suitable temperature support forests. The presence of water is the major factor that sustains aquatic communities.The first step in investigating a biotic community may be simply to catalogue all the species present. Species are the different kinds of plants, animals and microbes in the community. A given species includes all those individuals which have a strong similarity in appearance to one another and which are distinct in appearance from other such groups. Each species in a biotic community is represented by a certain population - that is, by a certain number of individuals that make up the interbreeding, reproducing group.
43[Q] Which of the following is not an abiotic factor?
Correct Answer
📖 Core Biological Concept
The biotic community consists of all living organisms, including plants, animals, and microbes. Abiotic factors are the non-living components of the environment that affect living organisms.
🔬 Anatomical & Physiological Mechanism
Abiotic factors include:
- Temperature
- Humidity
- Moisture
- Soil type
- Salinity
Algae, however, are part of the biotic community as they are living organisms classified under plants.
🔍 Option Analysis
- A: Temperature - An abiotic factor influencing life.
- B: Humidity - Another abiotic factor impacting ecosystems.
- C: Algae - A biotic factor; therefore, it is the correct answer.
- D: Moisture - An abiotic factor essential for supporting life.
⚡ Memory Hook (Mnemonic)
Remember "Non-living matters are abiotic" to distinguish them from biotic factors, which are living.
👁️ Visual Suggestion
6. Visual Suggestion
A Venn diagram illustrating the differences between abiotic and biotic factors, highlighting their definitions and examples.
📖 Factual Verification & Reference
Verified against NCERT Class 11 Biology, Chapter on Ecosystems.
Directions:Read the following passage carefully and answer the items based on it. You are required to select your answers based solely on the contents of the passage and the opinion of the author.The grouping or assemblage of plants, animals and microbes we observe when we study a natural forest, a grassland, a pond, a coral reef or some other undisturbed area, is referred to as the area's biota or biotic community. The plant portion of the biotic community includes all vegetation, from large trees down through to microscopic algae. Likewise, the animal portion includes everything from large mammals, birds, reptiles and amphibians through to earthworms, tiny insects and mites. Microbes encompass a large array of microscopic bacteria, fungi and protozoans. Thus, the biotic community comprises a plant community, an animal community and a microbial community.The particular kind of biotic community found in a given area is, in large part, determined by abiotic factors such as the amount of water or moisture present, the temperature, the salinity, or the type of soil in the area. These abiotic factors both support and limit the particular community. For example, a relative lack of available moisture prevents the growth of most species of plants, but supports certain species, such as cacti; these kinds of areas and a suitable temperature support forests. The presence of water is the major factor that sustains aquatic communities.The first step in investigating a biotic community may be simply to catalogue all the species present. Species are the different kinds of plants, animals and microbes in the community. A given species includes all those individuals which have a strong similarity in appearance to one another and which are distinct in appearance from other such groups. Each species in a biotic community is represented by a certain population - that is, by a certain number of individuals that make up the interbreeding, reproducing group.
42[Q] The nature of the biotic community largelydepends on
:1. Biotic components
2. Abiotic components
Select the correct answer using the code given below:
Correct Answer
📖 Core Biological Concept
The biotic community is an assemblage of plants, animals, and microbes. Its composition and characteristics depend on various abiotic factors including temperature, moisture, and soil type.
🔬 Anatomical & Physiological Mechanism
The biotic community entails:
- Biotic components: All living organisms in the ecosystem, including flora, fauna, and microbes.
- Abiotic components: Non-living environmental factors like water, soil, and climate that influence biotic factors.
The diversity and type of species present (biota) are shaped significantly by these abiotic factors, as noted with examples such as cacti thriving in dry areas.
🔍 Option Analysis
Option A (1 only) is incorrect since it ignores abiotic factors. Option B (2 only) overlooks the importance of biotic interactions, making it incomplete. Option D (Neither 1 nor 2) is also incorrect as both components play critical roles.
⚡ Memory Hook (Mnemonic)
Remember the acronym “BIO-A” for Biotic and Abiotic components: Biota Is Ornate with Abiotic influences.
6. Visual Suggestion
6. Visual Suggestion
A flowchart illustrating the interactions between biotic (plants, animals, microbes) and abiotic (water, temperature, soil) factors in ecosystems for better visual comprehension.
📖 Factual Verification & Reference
Verified against NCERT Class 11 Biology, Chapter on Ecosystems.
Directions:Read the following passage carefully and answer the items based on it. You are required to select your answers based solely on the contents of the passage and the opinion of the author.The grouping or assemblage of plants, animals and microbes we observe when we study a natural forest, a grassland, a pond, a coral reef or some other undisturbed area, is referred to as the area's biota or biotic community. The plant portion of the biotic community includes all vegetation, from large trees down through to microscopic algae. Likewise, the animal portion includes everything from large mammals, birds, reptiles and amphibians through to earthworms, tiny insects and mites. Microbes encompass a large array of microscopic bacteria, fungi and protozoans. Thus, the biotic community comprises a plant community, an animal community and a microbial community.The particular kind of biotic community found in a given area is, in large part, determined by abiotic factors such as the amount of water or moisture present, the temperature, the salinity, or the type of soil in the area. These abiotic factors both support and limit the particular community. For example, a relative lack of available moisture prevents the growth of most species of plants, but supports certain species, such as cacti; these kinds of areas and a suitable temperature support forests. The presence of water is the major factor that sustains aquatic communities.The first step in investigating a biotic community may be simply to catalogue all the species present. Species are the different kinds of plants, animals and microbes in the community. A given species includes all those individuals which have a strong similarity in appearance to one another and which are distinct in appearance from other such groups. Each species in a biotic community is represented by a certain population - that is, by a certain number of individuals that make up the interbreeding, reproducing group.
41[Q] Which one of the following does not belong tothe biotic community?
Correct Answer
📖 Governing Law / Core Concept
The term "biotic community" refers to the assemblage of living organisms (plants, animals, and microbes) in a specific environment. Water, while essential for life, is an abiotic factor influencing the community.
🧪 Step-by-Step Breakdown
- The biotic community consists of:
- Plant community (e.g., trees, algae)
- Animal community (e.g., mammals, insects)
- Microbial community (e.g., bacteria, fungi)
- Abiotic factors (non-living) include:
- Water
- Soil type
- Temperature
- Salinity
- Water supports life but is not part of the living community.
🔍 Option Analysis
Option (b): Human - a part of the animal community.
Option (c): Protozoa - part of the microbial community.
Option (d): Bush - part of the plant community.
⚡ Mnemonic / Speed-Run
For biotic vs abiotic recall: "Biotic breaths, abiotic hosts." Biotic includes life forms; abiotic includes environment factors.
6. Visual Suggestion
6. Visual Suggestion
A flowchart illustrating the biotic community could differentiate between plants, animals, and microbes, connected to abiotic factors like water, temperature, and soil type, showcasing their interdependence.
📖 Factual Verification & Reference
Verified against NCERT Class 11 Biology, Chapter 13 (Organisms and Populations).
Relationship between a flower and honey-bee will help the flower for/in
Explanation: Bees and flowering plants engage in a mutualistic relationship that proves advantageous to both species. Within this symbiotic partnership, flowers offer bees a source of nectar and pollen, which diligent worker bees collect to sustain their entire colonies. In return, bees play a vital role for flowers in their reproductive process by facilitating the transfer of pollen from one flower to another, a crucial step known as pollination. This mutual dependency ensures the continued survival and propagation of both bees and flowering plants.