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UCE (O-Level) Biology — practice by topic

Browse 30 questions across 1 Biology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Biology topics

Animal Nutrition and the Digestive System (30)

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An animal that eats both plants and other animals is placed in which group?Read the answer and worked solution →What is the defining feature of a gastrovascular cavity?Read the answer and worked solution →How does an alimentary canal differ from a gastrovascular cavity?Read the answer and worked solution →Which animal is given as an example of one with an alimentary canal?Read the answer and worked solution →

Worked practice questions

An animal that eats both plants and other animals is placed in which group?

  1. Omnivores
  2. Herbivores
  3. Carnivores
  4. Ruminants
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Correct answer: A. Omnivores

1. Animals are grouped by diet into three categories. 2. Plant eaters are herbivores and meat eaters are carnivores. 3. Those that eat both plants and animals are omnivores. 4. Ruminant describes a stomach type, not what the animal chooses to eat. _Source: OpenStax Biology 1e (CC BY 4.0), Ch 34 "Animal Nutrition and the Digestive System", section 34.1 | Digestive Systems_

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What is the defining feature of a gastrovascular cavity?

  1. It has a separate mouth and anus
  2. It has only one opening for digestion
  3. It has two chambers in sequence
  4. It has no digestive enzymes at all
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Correct answer: B. It has only one opening for digestion

1. The gastrovascular cavity is the simplest digestive arrangement. 2. It has only one opening, so the same hole serves for taking food in and passing waste out. 3. Flatworms, comb jellies and cnidarians such as jellyfish digest this way. 4. Cells lining the cavity secrete enzymes and then engulf the food particles. _Source: OpenStax Biology 1e (CC BY 4.0), Ch 34 "Animal Nutrition and the Digestive System", section Invertebrate Digestive Systems_

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How does an alimentary canal differ from a gastrovascular cavity?

  1. It secretes no enzymes of its own
  2. It absorbs nothing into the body
  3. It has a mouth at one end and an anus
  4. It works only in aquatic animals
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Correct answer: C. It has a mouth at one end and an anus

1. The alimentary canal is described as the more advanced of the two systems. 2. It is one tube with a mouth at one end and an anus at the other. 3. Food therefore travels one way and can be processed in stages along the tube. 4. A gastrovascular cavity has a single opening doing both jobs. _Source: OpenStax Biology 1e (CC BY 4.0), Ch 34 "Animal Nutrition and the Digestive System", section Invertebrate Digestive Systems_

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