UPCAT General Science (Extended) — Ecology, Biogeochemical Cycles & Species RelationshipsSlides
Slide deck for UPCAT General Science (Extended) — Ecology, Biogeochemical Cycles & Species Relationships. These slides are built for quick visual review, highlighting the key concepts, formulas, and question patterns from this chapter of the UPCAT 2026 syllabus.
Exam context
For the University of the Philippines College Admission Test, University of the Philippines tests General Science (Extended) under a "Extended coverage for UP Science programs" label, with Ecology, Biogeochemical Cycles & Species Relationships in the 6th slot across 6 chapters. UPCAT candidates must clear the UPG ≤ 2.2 typical cut on the 2026 paper, which draws about 20 General Science (Extended) questions. Date to watch: Mid-2026 (announced by UP Admissions).
Ecology, Biogeochemical Cycles & Species Relationships - Slides
This chapter explores the fascinating world of ecology - how living organisms interact with each other and their environment. We'll discover the levels of ecological organization from individual organisms to the entire biosphere, understand how essential elements cycle through ecosystems, and examine the various relationships between different species. These concepts are fundamental to understanding environmental science and are commonly tested in UPCAT and other college entrance exams.
Slides
Introduction to Ecology
Ecology helps us understand how living things survive and thrive in their surroundings. It's like studying a complex web of relationships in nature, from tiny bacteria to massive ecosystems.
Notes
Understanding ecology is crucial for environmental conservation and sustainable development in the Philippines.
Topic
Introduction to Ecology
Slide Id
S1
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mermaid
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1
Mermaid Diagram
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mindmap root((Ecology)) Biotic Factors Plants Animals Microorganisms Humans Abiotic Factors Climate Water Soil Sunlight Temperature Interactions Competition Predation Symbiosis Food Chains
Type
mermaid_mindmap
Description
Mind map showing the main components and factors studied in ecology
Levels of Ecological Organization
Think of ecological organization like nested boxes - each larger box contains all the smaller ones. This hierarchy helps scientists study nature at different scales.
Notes
Each level has emergent properties - characteristics that arise only when components interact as a whole.
Topic
Ecological Organization
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S2
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mermaid
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2
Mermaid Diagram
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flowchart TD A[Organism] --> B[Population] B --> C[Community] C --> D[Ecosystem] D --> E[Biosphere] A1[Individual tarsier] --> B1[All tarsiers in area] B1 --> C1[All forest species] C1 --> D1[Forest plus environment] D1 --> E1[All life on Earth]
Type
mermaid_flowchart
Description
Flowchart showing the hierarchy of ecological organization with Philippine examples
Organism and Population Level
At the organism level, we study how individual creatures adapt to survive. At the population level, we examine groups of the same species and how their numbers change over time.
Notes
Population studies help in wildlife conservation efforts, especially for endangered Philippine species.
Topic
Organism and Population
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S3
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mermaid
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3
Mermaid Diagram
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flowchart LR A[fa:fa-leaf Individual Organism] --> B[Adaptations] B --> C[Survival] C --> D[Reproduction] E[Population] --> F[Same Species] F --> G[Geographic Area] G --> H[Interbreeding Capability]
Type
mermaid_flowchart
Description
Flowchart showing the characteristics of organism and population levels
Community and Ecosystem Level
A community is like a neighborhood where different species live together and interact. An ecosystem adds the 'house' (physical environment) to this neighborhood.
Notes
Philippines has diverse ecosystems from coral reefs to cloud forests, each with unique community structures.
Topic
Community and Ecosystem
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S4
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mermaid
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4
Mermaid Diagram
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flowchart TD A[Community] --> B[Multiple Species] B --> C[Interactions] C --> D[Competition] C --> E[Predation] C --> F[Symbiosis] G[Ecosystem] --> H[Community + Environment] H --> I[Energy Flow] H --> J[Nutrient Cycling]
Type
mermaid_flowchart
Description
Flowchart comparing community and ecosystem levels of organization
Biosphere - The Highest Level
The biosphere is like Earth's living skin - a thin layer where all life exists. It's where the atmosphere (air), hydrosphere (water), and lithosphere (land) meet and interact.
Notes
Climate change and global warming demonstrate how biosphere-level processes affect local Philippine ecosystems.
Topic
Biosphere
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S5
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mermaid
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5
Mermaid Diagram
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flowchart TD A[fa:fa-globe Biosphere] --> B[Atmosphere] A --> C[Hydrosphere] A --> D[Lithosphere] B --> E[All gases around Earth] C --> F[All water on Earth] D --> G[Rock and soil layers] E --> H[fa:fa-leaf Life Zone] F --> H G --> H
Type
mermaid_flowchart
Description
Flowchart showing the components that make up the biosphere
Feeding Relationships: Producers vs Consumers
Think of producers as the 'cooks' of nature - they make food from simple ingredients using sunlight. Consumers are like 'customers' who must eat the food that producers or other consumers make.
Notes
The Philippines' agriculture depends heavily on producer organisms like rice, corn, and coconut trees.
Topic
Producers and Consumers
Slide Id
S6
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mermaid
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6
Mermaid Diagram
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flowchart TD A[fa:fa-leaf Producers Autotrophs] --> B[Make own food] B --> C[Use sunlight or chemicals] C --> D[Photosynthesis] E[Consumers Heterotrophs] --> F[Eat other organisms] F --> G[Primary Consumers] F --> H[Secondary Consumers] F --> I[Tertiary Consumers] A --> E
Type
mermaid_flowchart
Description
Flowchart showing the relationship between producers and consumers in ecosystems
Types of Consumers in Ecosystems
Different consumers have different diets, just like people preferring different foods. Each type plays a specific role in maintaining ecosystem balance.
Notes
Understanding consumer types helps in managing agricultural pests and conserving beneficial species.
Topic
Consumer Types
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S7
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mermaid
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7
Mermaid Diagram
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pie title Consumer Types in Ecosystem "Herbivores" : 40 "Carnivores" : 25 "Omnivores" : 20 "Decomposers" : 15
Type
mermaid_pie
Description
Pie chart showing the distribution of different consumer types in a typical ecosystem
Introduction to Biogeochemical Cycles
Unlike energy that flows in one direction and is lost as heat, chemical elements go round and round in nature. It's like a recycling system that has been working for billions of years.
Notes
Biogeochemical cycles are essential for understanding pollution, fertilizer use, and climate change impacts.
Topic
Biogeochemical Cycles Introduction
Slide Id
S8
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mermaid
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8
Mermaid Diagram
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flowchart LR A[fa:fa-leaf Living Organisms] --> B[Death and Decomposition] B --> C[Chemical Elements Released] C --> D[fa:fa-globe Environment] D --> E[Uptake by New Organisms] E --> A F[Energy Flow] --> G[fa:fa-arrow-right One Direction] H[Matter Cycling] --> I[fa:fa-refresh Round and Round]
Type
mermaid_flowchart
Description
Flowchart showing how matter cycles while energy flows in ecosystems
The Water Cycle
The water cycle is nature's way of recycling water. Water changes from liquid to gas and back to liquid as it moves around the Earth, just like steam from your rice cooker condensing on the lid.
Notes
Philippines' tropical climate and archipelago structure make it ideal for studying water cycle processes.
Topic
Water Cycle
Slide Id
S9
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mermaid
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9
Mermaid Diagram
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flowchart TD A[fa:fa-sun Solar Energy] --> B[Evaporation from Oceans] B --> C[Water Vapor in Atmosphere] C --> D[Condensation] D --> E[Cloud Formation] E --> F[Precipitation] F --> G[Surface Water] F --> H[Groundwater] G --> I[Rivers and Lakes] H --> I I --> B J[fa:fa-leaf Plant Transpiration] --> C
Type
mermaid_flowchart
Description
Flowchart showing the complete water cycle process
The Nitrogen Cycle
Nitrogen is like a locked treasure chest - it's abundant in the air, but most living things can't use it until special bacteria 'unlock' it into forms that plants can absorb.
Notes
Understanding nitrogen cycle helps in proper fertilizer use and managing agricultural sustainability in the Philippines.
Topic
Nitrogen Cycle
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S10
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mermaid
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10
Mermaid Diagram
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flowchart TD A[Atmospheric Nitrogen N2] --> B[fa:fa-flask Nitrogen Fixation] B --> C[Ammonia NH3] C --> D[fa:fa-leaf Plant Uptake] D --> E[Plant Proteins] E --> F[Animal Consumption] F --> G[Animal Proteins] G --> H[Death and Decomposition] H --> I[fa:fa-refresh Denitrification] I --> A J[Lightning] --> B K[Bacteria] --> B
Type
mermaid_flowchart
Description
Flowchart showing the nitrogen cycle with key processes and transformations
Carbon and Oxygen Cycles
Carbon and oxygen cycles work together like dance partners. When plants do photosynthesis, they take in carbon dioxide and release oxygen. When animals breathe, they do the opposite.
Notes
Climate change concerns relate directly to disruptions in the carbon cycle, making this relevant to current environmental issues.
Topic
Carbon and Oxygen Cycles
Slide Id
S11
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mermaid
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11
Mermaid Diagram
Code
flowchart LR A[fa:fa-leaf Photosynthesis] --> B[CO2 + H2O] B --> C[Glucose + O2] D[fa:fa-heartbeat Cellular Respiration] --> E[Glucose + O2] E --> F[CO2 + H2O + Energy] C --> E F --> B G[Atmospheric CO2] --> B C --> H[Atmospheric O2] H --> E F --> G
Type
mermaid_flowchart
Description
Flowchart showing the interconnected carbon and oxygen cycles
Phosphorus and Sulfur Cycles
Unlike water and carbon that spend time in the atmosphere, phosphorus and sulfur mostly stay on land and in water. They're like homebodies that prefer to stay close to Earth's surface.
Notes
Philippines' volcanic geology makes it rich in sulfur, while proper phosphorus management is crucial for sustainable agriculture.
Topic
Phosphorus and Sulfur Cycles
Slide Id
S12
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mermaid
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12
Mermaid Diagram
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flowchart TD A[Rock Weathering] --> B[Soil Phosphorus] B --> C[fa:fa-leaf Plant Uptake] C --> D[Animal Consumption] D --> E[Decomposition] E --> B F[Volcanic Activity] --> G[Soil Sulfur] G --> H[fa:fa-leaf Plant Uptake] H --> I[Animal Consumption] I --> J[Decomposition] J --> G
Type
mermaid_flowchart
Description
Flowchart showing phosphorus and sulfur cycles in terrestrial environments
Introduction to Species Relationships
Just like people have different types of relationships - friendships, partnerships, and rivalries - species in nature also have various ways of interacting with each other.
Notes
Understanding species relationships helps in ecosystem management and biodiversity conservation efforts.
Topic
Species Relationships Introduction
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S13
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mermaid
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13
Mermaid Diagram
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mindmap root((Species Relationships)) Beneficial Mutualism Commensalism Protocooperation Harmful Parasitism Predation Amensalism Neutral Neutralism Competitive Competition
Type
mermaid_mindmap
Description
Mind map showing the different types of species relationships
Symbiotic Relationships
Symbiotic relationships are like roommate situations. In mutualism, both roommates benefit. In commensalism, one benefits while the other doesn't care. In parasitism, one benefits while the other suffers.
Notes
The Philippines' rich biodiversity provides many examples of symbiotic relationships, especially in marine environments.
Topic
Symbiotic Relationships
Slide Id
S14
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mermaid
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14
Mermaid Diagram
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flowchart TD A[Symbiotic Relationships] --> B[Mutualism] A --> C[Commensalism] A --> D[Parasitism] B --> B1[Both Benefit +/+] B1 --> B2[Bee and Flower] C --> C1[One Benefits One Neutral +/0] C1 --> C2[Orchid on Tree] D --> D1[One Benefits One Harmed +/-] D1 --> D2[Tick on Animal]
Type
mermaid_flowchart
Description
Flowchart showing the three main types of symbiotic relationships with examples
Competition and Other Relationships
Competition is like two students wanting the same scholarship - both are stressed. Predation is like a hunter and prey relationship. Some relationships have little to no effect on the species involved.
Notes
Competition is a major driving force in evolution and species distribution patterns.
Topic
Competition and Other Relationships
Slide Id
S15
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mermaid
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15
Mermaid Diagram
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flowchart TD A[Other Species Relationships] --> B[Competition -/-] A --> C[Predation +/-] A --> D[Amensalism -/0] A --> E[Neutralism 0/0] B --> B1[Limited Resources] C --> C1[Hunter and Prey] D --> D1[One Harmed Unintentionally] E --> E1[No Significant Interaction]
Type
mermaid_flowchart
Description
Flowchart showing non-symbiotic species relationships
Intraspecific vs Interspecific Relationships
Intraspecific relationships are like interactions between classmates in the same grade, while interspecific relationships are like interactions between students from different grades or schools.
Notes
Understanding these distinctions helps in wildlife management and conservation planning.
Topic
Intraspecific vs Interspecific
Slide Id
S16
Visual Type
mermaid
Image Prompt
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16
Mermaid Diagram
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flowchart LR A[Species Relationships] --> B[Intraspecific] A --> C[Interspecific] B --> B1[Same Species] B1 --> B2[Territory Competition] B1 --> B3[Mating Competition] C --> C1[Different Species] C1 --> C2[Predation] C1 --> C3[Symbiosis] C1 --> C4[Competition]
Type
mermaid_flowchart
Description
Flowchart comparing intraspecific and interspecific relationships
Ecological Niches and Competition
A species' niche is like its 'job description' in nature. The competitive exclusion principle says two species can't have exactly the same job in the same place - one will outcompete the other.
Notes
The concept of ecological niches explains why the Philippines can support such high biodiversity in relatively small areas.
Topic
Ecological Niches
Slide Id
S17
Visual Type
mermaid
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17
Mermaid Diagram
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flowchart TD A[fa:fa-leaf Species Niche] --> B[Habitat Requirements] A --> C[Food Resources] A --> D[Breeding Needs] E[Similar Niches] --> F{Competition} F -->|High| G[Competitive Exclusion] F -->|Reduced| H[Resource Partitioning] G --> I[One Species Eliminated] H --> J[fa:fa-check Coexistence]
Type
mermaid_flowchart
Description
Flowchart showing how ecological niches relate to competition and coexistence
Ecological Succession
Ecological succession is like the gradual development of a neighborhood - first, pioneer families move in, then more families follow, and eventually a stable community forms.
Notes
Understanding succession helps in forest restoration and ecosystem rehabilitation efforts in the Philippines.
Topic
Ecological Succession
Slide Id
S18
Visual Type
mermaid
Image Prompt
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18
Mermaid Diagram
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timeline title Ecological Succession Primary Succession Pioneer Species : Lichens and mosses Early Stage : Grasses and small plants Intermediate : Shrubs and small trees Mature : Climax forest community Secondary Succession Disturbance : Fire or storm Recovery : Grasses return first Growth : Shrubs and trees Restoration : Original community
Type
mermaid_timeline
Description
Timeline showing the stages of primary and secondary ecological succession
Food Chains and Energy Flow
A food chain is like a relay race where energy is passed from one runner to the next, but some energy is lost at each handoff. That's why there are fewer top predators than plant-eaters.
Notes
The 10% rule explains why food webs are pyramid-shaped and why top predators are relatively rare.
Topic
Food Chains and Energy Flow
Slide Id
S19
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mermaid
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19
Mermaid Diagram
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flowchart LR A[fa:fa-leaf Producers] --> B[Primary Consumers] B --> C[Secondary Consumers] C --> D[Tertiary Consumers] D --> E[Quaternary Consumers] A1[Rice Plants] --> B1[Grasshopper] B1 --> C1[Frog] C1 --> D1[Snake] D1 --> E1[Hawk] F[100% Energy] --> G[10% Energy] G --> H[1% Energy] H --> I[0.1% Energy]
Type
mermaid_flowchart
Description
Flowchart showing energy flow through trophic levels in a food chain
Chapter Summary and Review
This chapter covered the fundamental concepts of ecology that help us understand how nature works. These principles apply to everything from small ponds to entire forests and are essential for environmental conservation and management.
Notes
These concepts are frequently tested in UPCAT and other college entrance exams, especially in environmental science contexts.
Topic
Chapter Summary
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S20
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mermaid
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20
Mermaid Diagram
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mindmap root((Ecology Chapter Review)) Organization Levels Organism Population Community Ecosystem Biosphere Biogeochemical Cycles Water Cycle Nitrogen Cycle Carbon Oxygen Cycle Phosphorus Sulfur Cycle Species Relationships Symbiosis Competition Predation Succession Applications Conservation Agriculture Environmental Management
Type
mermaid_mindmap
Description
Comprehensive mind map summarizing all major topics covered in the ecology chapter
References
- BRAINBOX UPCAT AND OTHER COLLEGE ENTRANCE — Science Proficiency.pdf
- CET 2026 COMPREHENSIVE LECTURE NOTES — Science.pdf
- Philippine Department of Education Science Curriculum
- UPCAT Science Review Materials
In summary
Understanding ecology, biogeochemical cycles, and species relationships is crucial for comprehending how life on Earth functions and persists. These concepts form the foundation for environmental science and are essential for making informed decisions about conservation, agriculture, and sustainable development. The Philippines, with its rich biodiversity and unique ecosystems, provides excellent examples of these ecological principles in action. Master these concepts to excel in your UPCAT and other college entrance exams, and to become an informed citizen who can contribute to environmental protection and sustainability efforts.
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