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Photosynthesis and plant respiration – practice for Years 6–7

Sample questions on Photosynthesis and plant respiration with the right answer and a worked solution, from easy to hard. In the Pickles Academy app a child gets new questions of the same kind every time, so they can't just learn the answers by heart.

Subject
Biology
Year
Years 6–7
Curriculum area
Plant biology

Question types: Fill in the gaps

Rule: Photosynthesis and plant respiration

Photosynthesis: in the leaves (in chloroplasts) a plant uses light to make glucose and oxygen from carbon dioxide and water.

Respiration: by day and by night the plant uses oxygen and gives off carbon dioxide. Photosynthesis needs light.

Example: carbon dioxide + water → (light) → glucose + oxygen

Watch out: Plants don’t respire only at night: they respire all the time, but by day photosynthesis is greater.

Sample questions

  1. Question 1 Easy

    Fill in the right words.

    1. The green pigment in leaves is called …. (haemoglobin / chlorophyll / melanin)
    2. A plant takes in water mainly through its …. (flowers / roots / fruits)
    3. Photosynthesis makes a sugar called …. (glucose / caffeine / lactose)
    Show the solution
    Answer:
    1. The green pigment in leaves is called chlorophyll.
    2. A plant takes in water mainly through its roots.
    3. Photosynthesis makes a sugar called glucose.

    How it works: The green pigment in leaves is called chlorophyll. A plant takes in water mainly through its roots. Photosynthesis makes a sugar called glucose.

  2. Question 2 Normal

    Fill in the right words.

    1. In photosynthesis a plant takes in … from the air. (nitrogen / oxygen / carbon dioxide)
    2. Plants respire …. (by day and by night / only at night / only by day)
    3. In respiration a plant uses up …. (chlorophyll / carbon dioxide / oxygen)
    4. The energy for photosynthesis comes from …. (light / darkness / wind)
    Show the solution
    Answer:
    1. In photosynthesis a plant takes in carbon dioxide from the air.
    2. Plants respire by day and by night.
    3. In respiration a plant uses up oxygen.
    4. The energy for photosynthesis comes from light.

    How it works: In photosynthesis a plant takes in carbon dioxide from the air. Plants respire by day and by night. In respiration a plant uses up oxygen. The energy for photosynthesis comes from light.

  3. Question 3 Hard

    Fill in the right words.

    1. The green pigment in leaves is called …. (haemoglobin / chlorophyll / melanin)
    2. A plant takes in water mainly through its …. (flowers / roots / fruits)
    3. Photosynthesis makes a sugar called …. (glucose / caffeine / lactose)
    4. The energy for photosynthesis comes from …. (light / darkness / wind)
    Show the solution
    Answer:
    1. The green pigment in leaves is called chlorophyll.
    2. A plant takes in water mainly through its roots.
    3. Photosynthesis makes a sugar called glucose.
    4. The energy for photosynthesis comes from light.

    How it works: The green pigment in leaves is called chlorophyll. A plant takes in water mainly through its roots. Photosynthesis makes a sugar called glucose. The energy for photosynthesis comes from light.

Related topics

All Biology topics

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