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...
数学建模，就是根据实际问题来建立数学模型，对数学模型来进行求解，然后根据结果去解决实际问题。数学建模是一种数学的思考方法，是运用数学的语言和方法，通过抽象、简化建立能近似刻画并解决际问题的一种强有...
Ecosystems: Key Terms Habitat Species are adapted, or well-suited, to life in a particular habitat A habitat can be defined as the place where an organism lives A habitat can be large, e.g. a deser...
Sustainability & Plant Materials Sustainability refers to the using resources in such a way that the requirements of the current generation are met without depleting these resources for future ...
Conditions Required for Bacterial Growth Bacteria are microscopic prokaryotes (meaning their cells do not contain a nucleus or membrane-bound organelles) They are often used in studies to test anti...
Development of Drug Testing Whenever new drugs are developed, they first need to be tested for effectiveness and side-effects, before they can be sold to the general public These are known as clini...
Practical: Determinig the Tensile Strength of Plant Fibres The tensile strength of a fibre refers to the maximum load it can carry before breaking For example, this information would be important w...
Practical: Identifying Tissue Types Within Stems In order to identify tissue types within stems, a permanent pre-prepared slide could be used Alternatively, a section of a plant stem could be cut a...
Plant Fibres Sclerenchyma fibres and xylem vessels are made of long, hollow plant cells These cells are hollow due to the fact that their cell contents died (often due to the lignification of the c...
Starch & Cellulose: Structure & Function Starch Starch is the storage polysaccharide of plants It is stored as granules in plastids (e.g. chloroplasts) and amyloplasts (small, membrane boun...
Importance of Water & Inorganic Ions to Plants Plant cells perform a variety of different functions In order to perform these functions efficiently, the plant requires water and inorganic ions ...
