A. A food chain has more organisms. B. A food web is more complex. C. A food chain is only in forest ecosystems. D. A food web is only in grassland E. cosystems. 相关知识点: 试题来源: 解析 B。食物网比食物链更复杂,食物网是由多条食物链相互交错形成的。食物链通常只涉及少数几种生...
The longer the food chain, the more energy is transferred at each level D. All animals in a food web are predators 相关知识点: 试题来源: 解析 B。解析:在食物链中,通常不包含分解者,分解者主要是参与物质的分解循环,不在食物链的能量传递环节中。选项A中,食物网是由多条食物链相互交错构成的,而...
Most animals are part of more than one food chain and eat more than one kind of food in order to meet their food and energy requirements. These interconnected food chains form a food web.The following is a possible food web: Note that the arrows are drawn from food source to food cons...
Every food web and chain has as its backbone, transfer of energy to consumers from producers; this is the bottom-up force. Some but not all webs and chains have opposite top-down effects, which attenuate and change bottom-up forces. Top-down effects are best understood in light of how ...
食物网(food web)和食物链(food chain)有什么区别? 答案 食物网(food web)又称食物链网或食物循环.在生态系统中生物间错综复杂的网状食物关系.实际上多数动物的食物不是单一的,因此食物链之间又可以相互交错相联,构成复杂网状关系.在生态系统中生物之间实际的取食和被取食关系并不象食物链所表达的那么简单,食虫鸟...
The different feeding positions in a food chain or web are called trophic levels. The first trophic level consists of producers, the second of primary consumers, the third of secondary consumers, and so on. There usually are no more than four or fiv...
Food chain is a linear sequence of organisms which starts from producer organisms and ends with decomposer species. Food web is a connection of multiple food chains. Food chain follows a single path whereas food web follows multiple paths. From the food chain, we get to know how organisms ...
Food chain and food web represent how living organisms feed to get the energy that sustains their growth, reproduction, and movement in their respective ecological systems.
•Alivingorganismgetenergybybreakingdowntheremainsofdeadorganisms•Canbebacteria,fungi,protists,ordetritivores(someorganismseatingdeadorganisms),etc.•Canhelprecycleofnutrientsintheecosystem Foodchain Foodweb Throughfoodchainandfoodweb,nutrients(elements)weretransferredandenergywasflowed Whatistheoriginalenergy...
Get ready to teach your students the difference between a food web and a food chain, examples of food chains, and more core components of the elementary school science curriculum with this teacher-created collection of resources! From food webs and food chains worksheets to printables that will ...