Higher:
解释有毒物质浓度在食物链中如何变化。
Middle:
举例说明一种发生在生态系统中的生物富集
Lower:
定义生物富集。
What is bioaccumulation?
What do farmers need to consider before using pesticides?
Why is it difficult to predict if bioaccumulation will occur?
Bioaccumulation is the gradual accumulation of substances, such as pesticides, or other chemicals in an organism. Bioaccumulation occurs when an organism absorbs a substance at a rate faster than that at which the substance is lost by catabolism and excretion.
Toxins can accumulate within an individual organism and therefore inturn build up within a food chain. As species within an ecosystem are highly interconnected any abiotic change can large knock-on effects.
The use of pesticides can build up in an ecosystem. Particularly if they do not easily breakdown in the natural environment of inside organisms.
how organisms affect, and are affected by, their environment, including the accumulation of toxic materials.
Grade 8 Microorganisms - Friends or Foe
说明不同的动物以植物或其他动物为食。动物需要消耗这些食物来获得能量。了解什么是食物网。
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