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Miracle Learning Centre Science Tuition Question on Food Chain/Web. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition)

1 Over a period of several months, a student recorded some activities of the wild life in a particular habitat. The following observations appeared in her notebook.

(a) Complete Fig. 5.1 by filling in the names of the organisms to show the trophic levels (feeding relationships) in this community.

(b) (i) What name is given to a chart of trophic levels as shown in Fig. 5.1? ______________________________________________________[1] (ii) Name one tertiary consumer. ______________________________________________________[1] (c) Fig. 5.1 also shows how much energy from the bean plants is transferred to each trophic level in the relevant food chain. (i) Where does the energy stored in the bean plants originally come from? ______________________________________________________[1] (ii) Calculate the percentage of energy in A that is transferred to organism B. Show your working. _________________________________________________________ ______________________________________________________[2] (iii) Describe two ways in which energy is lost within a level of a food chain. 1 ___________________________________________________ 2 ________________________________________________[2] (iv) This food chain has four trophic levels. Most food chains have no more than five trophic levels. Explain why the length of food chains is limited in this way. _________________________________________________________ _________________________________________________________ _________________________________________________________ ______________________________________________________[2] [Total: 12]

Miracle Learning Centre Answer to Science Tuition Question on Food Chain/Web. (O Level Science Tuition/IP Science Tuition/Secondary Science Tuition)

(a) Complete Fig. 5.1 by filling in the names of the organisms to show the trophic levels (feeding relationships) in this community.

(b) (i) What name is given to a chart of trophic levels as shown in Fig. 5.1? food web

(ii) Name one tertiary consumer.

hawk / spider

(c) Fig. 5.1 also shows how much energy from the bean plants is transferred to each trophic level in the relevant food chain. (i) Where does the energy stored in the bean plants originally come from? sun / solar energy [1]

(ii) Calculate the percentage of energy in A that is transferred to organism B. Show your working. 130 x 100% = 11.8% 1100

(iii) Describe two ways in which energy is lost within a level of a food chain. 1 lost as heat during respiration / in the faeces as undigested food 2 used for growth / movement / reproduction [2]

(iv) This food chain has four trophic levels. Most food chains have no more than five trophic levels. Explain why the length of food chains is limited in this way. • Because of inefficient energy transformation,a shorter food chain reduces energy losses between trophic levels. • The energy available for the highest trophic level might be too little to sustain the population. [2] Total: 12]

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