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Olympiad (Class 7) Nutrition in plants and animals — practice questions

Explore 60 free Nutrition in plants and animals questions in Olympiad (Class 7) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Nutrition in plants and animals questions and exercises with answers

Showing questions 1–30 of 60.

Leaves look green because their main pigment reflects green light. Which pigment is it?Read the answer and worked solution →Which gas do green plants release while making food in sunlight?Read the answer and worked solution →The oxygen set free during photosynthesis comes from the splitting of which substance?Read the answer and worked solution →Which pair of raw materials do green leaves use to make food in light?Read the answer and worked solution →Which process breaks down sugars to carbon dioxide and water to release energy?Read the answer and worked solution →In which cell part does cellular respiration take place?Read the answer and worked solution →Early oxygen-releasing microbes helped fill Earth's air with oxygen. Which were they?Read the answer and worked solution →Which of these is a sugar that plants make in photosynthesis?Read the answer and worked solution →Into which form of energy does photosynthesis convert sunlight?Read the answer and worked solution →What is an organism called that cannot make its own food and eats other organisms?Read the answer and worked solution →A mushroom has no chlorophyll. Its mode of nutrition isRead the answer and worked solution →Which role can a heterotroph never play in a food chain?Read the answer and worked solution →Which organisms feed on rotting plant and animal remains and dung?Read the answer and worked solution →Mould on stale bread digests it outside its body and absorbs it. This isRead the answer and worked solution →Which pair correctly matches how animals and fungi take in food?Read the answer and worked solution →Corals get organic carbon from a partnership with which kind of organisms?Read the answer and worked solution →A pitcher plant has green leaves but also traps insects. Insects mainly give it extraRead the answer and worked solution →Which kind of plant has become fully or partly dependent on other organisms for food?Read the answer and worked solution →Which enzyme in saliva starts the digestion of starch?Read the answer and worked solution →Chewing rice for a long time makes it taste sweeter as starch turns intoRead the answer and worked solution →Chewed food mixed with saliva forms a soft ball called aRead the answer and worked solution →What is the thick semi-liquid formed in the stomach called?Read the answer and worked solution →Pepsin in the stomach begins the digestion of which nutrient?Read the answer and worked solution →Which acid is the main acid in gastric juice?Read the answer and worked solution →Why does strong stomach acid not eat away the stomach wall?Read the answer and worked solution →The inactive pepsinogen is turned into active pepsin byRead the answer and worked solution →The food pipe of an adult is on average about how long?Read the answer and worked solution →What do we call the wave-like muscle squeeze that pushes food down the food pipe?Read the answer and worked solution →Which teeth do you mainly use to tear a tough piece of meat?Read the answer and worked solution →Biting a piece off an apple mainly uses which teeth?Read the answer and worked solution →

Worked practice questions

Leaves look green because their main pigment reflects green light. Which pigment is it?

  1. Chlorophyll
  2. Haemoglobin
  3. Melanin
  4. Keratin
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Correct answer: A. Chlorophyll

Chlorophyll absorbs red and blue light and reflects green, so leaves look green.

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Which gas do green plants release while making food in sunlight?

  1. Carbon dioxide gas
  2. Oxygen gas supply
  3. Nitrogen gas
  4. Hydrogen gas
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Correct answer: B. Oxygen gas supply

Oxygenic photosynthesis in plants gives off oxygen gas as it makes sugar.

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The oxygen set free during photosynthesis comes from the splitting of which substance?

  1. Carbon dioxide gas
  2. Glucose sugar
  3. Water molecules
  4. Starch grains
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Correct answer: C. Water molecules

Oxygen is a by-product of water splitting, not of carbon dioxide or sugar.

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