Chloroplasts: Structure & Function Chloroplasts are the organelles in plant cells where?photosynthesis?occurs Each chloroplast is surrounded by a?double-membrane?known as the?chloroplast envelo...
ATP as a Supply of Energy All organisms require a?constant supply of energy?to maintain their cells and stay alive This energy is required e.g. For building new molecules from the products of diges...
Photosynthesis: An Overview Photosynthesis?is a series of chemical reactions that occurs in?producers?such as plants and algae Photosynthesis converts?light energy?into?chemical energy?which is the...
Calculating the Efficiency of Biomass & Energy Transfers Transfer of energy through a food chain During?photosynthesis?organisms such as plants convert?light energy?into?chemical energy?stored ...
Net Primary Productivity During?photosynthesis?organisms such as plants?convert?light energy?into?chemical energy?stored in biological molecules Organisms that do this are known as?producers The?ra...
Stages of Succession Ecosystems are?dynamic, meaning that they are constantly?changing The?process of ecosystem change over time?is known as?succession During succession, the?biotic?and?abiotic?con...
Practical: Determining Distribution & Abundance Finding out about the?abundance?and?distribution?of species can be achieved by counting all of the organisms present in a habitat This is possibl...
Niches: Distribution & Abundance The place where a species lives is known as its?habitat Species will occupy a specific?niche?within a habitat The term niche can be defined as?the role of a spe...
Biotic Factors The?abundance?and?distribution?of a species within a habitat are determined by a combination of biotic and abiotic factors Biotic factors?are?living?factors that influence population...
