Welcome to Biology Notes Online! We are the BNO Team, dedicated to providing high-quality, accessible biology study notes for students and teachers alike. Our goal is to simplify complex biological concepts and present them in an easy-to-understand format, entirely free of charge. Whether you're preparing for exams, teaching a class, or simply passionate about biology, our comprehensive notes are designed to support your learning and teaching journey.
What is Ecological Succession? Ecological Succession Definition Ecological succession is the systematic and predictable process by which species composition in an ecosystem changes over time, progressing from initial colonization to a mature and stable community. Characteristics of Ecological Succession Ecological succession is a fundamental concept in the realm of ecology, delineating the sequential transformation of … Read more
What is Pyramid of Number? The Pyramid of Numbers is a graphical representation used in ecology to illustrate the distribution of various species in different trophic levels of a food chain. This pyramid provides a quantitative analysis, showing the number of individual organisms present at each trophic level. Unlike other ecological pyramids which might consider … Read more
Microbial interaction is a biological interaction in which the effect of microorganisms on other biotic components of an ecosystem can be investigated. Microbiology is the study of microorganisms, and microbial ecology is the study of microbial interactions within an ecosystem. Positive and negative microbial interactions are possible, and microbes can affect (positively or negatively) other … Read more
What is Carbon Fixation? Carbon Fixation Definition Carbon fixation is a biological process where atmospheric carbon dioxide (CO2) is converted into organic compounds, primarily by plants, algae, and certain bacteria. This process is a key component of photosynthesis, enabling the incorporation of inorganic carbon from the atmosphere into organic molecules like carbohydrates, thereby playing a … Read more
Primary consumers are fundamental components of ecological food chains, holding a critical position as the link between producers and higher trophic levels. In essence, they are organisms that feed directly on primary producers, typically plants or algae, which are capable of photosynthesis. Occupying the second trophic level, primary consumers are mostly herbivores, although some omnivorous … Read more
What are Secondary Consumers? Definition of Secondary Consumers Secondary consumers are organisms that primarily feed on primary consumers, which are herbivores, in a food chain. They occupy the third trophic level and can be either carnivores, who eat only other animals, or omnivores, who consume both animal and plant matter. Their role is vital in … Read more
What is Soil Biology? What is Soil? Components of Soil The components of soil exhibit variations in their ratios across different locations due to various soil-forming factors, climate, topology, the presence of organisms, human influences, and the duration of their interaction. These components can be broadly categorized into four main groups: The relative proportions and … Read more
What is Eutrophication? Definition of Eutrophication Eutrophication is the process in which a water body becomes overly enriched with nutrients, leading to the excessive growth of algae and plankton. This often results in the deterioration of water quality, depletion of oxygen, and ecological imbalances in the affected ecosystem. Causes of Eutrophication – What causes eutrophication? … Read more
Types of Microorganisms In Pond Water 1. Arthropods 2. Bacteria 3. Protozoa 4. Hydra 5. Algae Algae are autotrophic protists commonly found in pond water. They exhibit a wide range of colors, with most microorganisms being green, while some may appear yellowish-brown. The diversity of algae extends to their structure, where they can exist as … Read more
What is Biotic Factor? A biotic factor is a living component that affects another organism or shapes the ecosystem. These can be animals, plants, fungi, and microorganisms. They relate to the living things in an ecosystem and are essential for the survival and growth of organisms within their environment. Biotic factors determine the types and … Read more
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