dawn and dusk (dim light)
Photosynthesis and respiration proceed at the same rate. The plant takes in the same amount of carbon dioxide as it gives out.
Photosynthesis stops, respiration continues. The plant gives out carbon dioxide but no longer takes it in.
For example, the KS1 topics already assume that children realise that plants are alive - they are a life-form. Showing young children time lapse photographic sequences (for example the germinating bean in download 3) is very good evidence for movement and growth, which normally cannot be seen except in some of the touch sensitive plants. Even then plants don’t eat, do they? They can’t see can they? We need to help intending teachers to address these questions with the pupils they teach.
KS3 biology Quiz on "PLANTS and PHOTOSYNTHESIS" …
Provide boxes of plant fertiliser for pupils to explore the ingredients listed, and ask them to use secondary sources to find out why plants need certain minerals, for healthy growth.
Yacapaca! Year 8 - photosynthesis (KS3 Science)
(Download 2.0a) Questions about plants can be used to elicit students' pre-existing ideas about how plants work. This deals with a number of confusions, such as the distinction between germination and growth, and whether plants respire at all or only some of the time. The accompanying PowerPoint (download 2.0b) can be used with intending teachers to get them thinking about how plants work and to address some of their misconceptions. It will also help those that do have good biological knowledge to see the problems that face those, such as their pupils in school, who are trying to understand plant biology.
KS3 Science - Year 8 - photosynthesis
When asked to name some plants children often stick to either bright large flowers or houseplants. If, by plant, we refer to producers* at the start of food webs, we must ensure that our pupils also have the same broad view: trees, cabbages, grass, daffodils, all are plants. [*Remember that not all food chains begin with true plants, therefore not all producers are true plants i.e. phytoplankton & Pleurococcus (single celled photosynthesising organisms)]
Questions based around photosynthesis
Children are less aware of the names of plant groups than of animal groups. Nature walks where they identify common wild flowers and trees are so helpful in helping them realise that not all trees are the same and not all hedgerow and grassland plants are the same.
Key Stage 3 Study Preparation Test Papers | KS3 …
Once children learn about photosynthesis and they hear that this is in ‘contrast’ to respiration, many believe that plants only respire during the night, because they give out oxygen and take in carbon dioxide in the daytime. Whether a plant takes up or gives out carbon dioxide depends on how much light there is. The arrows in the following diagram show the movement of carbon dioxide into and out of a tree: