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MYP Biology Food Chains and Webs Questionbank

Question

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What is the functional difference between a detritivore and a decomposer?

A

Detritivores are producers, while decomposers are consumers

B

Decomposers only live in water, while detritivores only live on land

C

There is no functional difference; the terms are synonymous

D

Detritivores ingest dead matter, while decomposers secrete enzymes for external digestion

Question

Which of the following organisms is correctly matched with its specific trophic level in a standard food chain?

Why is a pyramid of biomass in a terrestrial ecosystem usually wide at the bottom and narrow at the top?

What is the primary ecological reason why food chains rarely exceed five trophic levels?

True or False: A keystone species is defined by being the most abundant species within its ecosystem.

Practice MYP MYP Biology Topic Food Chains and Webs with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for Food Chains and Webs and mirrors Paper 1, 2 style where relevant.

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A

Grasshopper — Secondary consumer

B

Oak tree — Producer

C

Hawk — Primary producer

D

Toad — Primary consumer

A

Because there are more carnivores than herbivores in most forests

B

Because producers have the highest total dry mass to support higher levels

C

Because top predators have the largest body size

D

Because heat energy is converted into physical mass at higher levels

A

Producers cannot photosynthesize fast enough

B

Decomposers only work on the first three levels

C

Apex predators are too large to be eaten

D

There is not enough energy remaining to support another level

A

True

B

False

3

4

5

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MYP Biology Food Chains and Webs Questionbank

MYP MYP Biology Topic Food Chains and Webs Questionbank