IB Biology Topic C4.2.4 Construction of Food Chains and Food Webs Revision Notes (SL/HL)

IB Biology Topic C4.2.4 Construction of Food Chains and Food Webs Revision Notes (SL/HL) | RevisionDojo

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Food Chains and Webs: Arrows Point in the Direction Energy Flows

Definition

Food chain

A food chain is a linear sequence of organisms, each feeding on the previous one, illustrating the flow of energy and nutrients in an ecosystem.

A food chain begins with a producer, usually a photoautotroph such as a plant or alga that converts sunlight into chemical energy by photosynthesis.
This energy is stored in organic molecules such as carbohydrates and then passes to the organisms that feed on the producer.
Each arrow points from the organism being eaten to the organism that eats it, showing the direction of energy flow.

Definition

Food web

A food web is a complex network of interconnected food chains, representing all the feeding relationships within a community.

A Simple Forest Food Chain Shows the Sequence in Action

Producer: the oak tree (Quercus robur) produces acorns.
Primary consumer: the squirrel (Sciurus vulgaris) eats acorns.
Secondary consumer: the red fox (Vulpes vulpes) preys on squirrels.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

Unlock the rest of this chapter with a free account

Food Chains and Webs: Arrows Point in the Direction Energy Flows

Definition

Food chain

A food chain is a linear sequence of organisms, each feeding on the previous one, illustrating the flow of energy and nutrients in an ecosystem.

A food chain begins with a producer, usually a photoautotroph such as a plant or alga that converts sunlight into chemical energy by photosynthesis.
This energy is stored in organic molecules such as carbohydrates and then passes to the organisms that feed on the producer.
Each arrow points from the organism being eaten to the organism that eats it, showing the direction of energy flow.

Definition

Food web

A food web is a complex network of interconnected food chains, representing all the feeding relationships within a community.

A Simple Forest Food Chain Shows the Sequence in Action

Producer: the oak tree (Quercus robur) produces acorns.
Primary consumer: the squirrel (Sciurus vulgaris) eats acorns.
Secondary consumer: the red fox (Vulpes vulpes) preys on squirrels.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C4.2.4: Construction of Food Chains and Food Webs Notes

Food Chains and Webs: Arrows Point in the Direction Energy Flows

A Simple Forest Food Chain Shows the Sequence in Action

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Food Chains and Webs: Arrows Point in the Direction Energy Flows

A Simple Forest Food Chain Shows the Sequence in Action

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics