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Olympiad (Class 7) Biology — practice by topic

Browse 30 questions across 3 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

Biology (30)Nutrition in Plants (30)Olympiad Science (30)

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A mango tree builds its own food using sunlight. Its mode of nutrition is:Read the answer and worked solution →A deer chews leaves because it cannot make food itself. Deer are called:Read the answer and worked solution →Tiny pores on a leaf surface let gases pass in and out. They are the:Read the answer and worked solution →A gardener notices leaves are green. The pigment that gives this colour is:Read the answer and worked solution →

Worked practice questions

A mango tree builds its own food using sunlight. Its mode of nutrition is:

  1. Autotrophic
  2. Saprotrophic
  3. Heterotrophic
  4. Symbiotrophic
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Correct answer: A. Autotrophic

1. Organisms that make their own food are autotrophs. 2. A mango tree makes food in its green leaves. 3. So its nutrition is autotrophic. _Source: syllabus Science Class VII, Chapter 1, Nutrition in Plants._

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A deer chews leaves because it cannot make food itself. Deer are called:

  1. Green cells
  2. Heterotrophs
  3. Autotrophs
  4. Producers
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Correct answer: B. Heterotrophs

1. Animals depend on plants or other animals for food. 2. Such food seekers are named heterotrophs. 3. So a deer is a heterotroph. _Source: syllabus Science Class VII, Chapter 1, Nutrition in Plants._

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Tiny pores on a leaf surface let gases pass in and out. They are the:

  1. Stomata
  2. Stigmas
  3. Sepals
  4. Stamens
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Correct answer: A. Stomata

1. Gas exchange in a leaf happens through small pores. 2. These pores are named stomata. 3. So the answer is stomata. _Source: syllabus Science Class VII, Chapter 1, Nutrition in Plants._

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