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Students find these difficult to draw/interpret/... because...

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Students need to know how to draw the diagram but this is not easy to draw. And some of them have difficulty in linking this drawing with the actual model.

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sometimes we only introduce some basic knowledge about the all picture but the reality is very complicated.

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Might be difficult for students to connect the diagram and the curve :)

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students are not really familiar with all the knowledge they've learnt. They can't flexibly use them well

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Students might miss some force components when drawing the diagram, or drawing wrong components from misunderstanding of the question. A wrong diagram usually causes wrong calculations.

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Students will think the large maltose molecules can pass through the differentially permeable membrane in this diagram... (the question mentioned ignoring hydrostatic pressure)

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students need to be clear about the properties of the lens in the eyeball and also concave/ convex lenses, as well as linking to the situation in seeing objects by forming image on the retina

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Too many processes and names to be memorised.

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difficult because too abstract without explanation.

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Difficult concept to visualize and understand muscle contractions

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Students need to remember different countries location and some countries time zone consists summer/winter time zone

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Students find it difficult to interpret because this cannot be seen in life

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difficult to understand the folding and turns of the structure

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Student fail to connect the diagram with 3D Space

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Student fail to connect the diagram with 3D Space

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The flow of air is difficult to observe. Experiments are needed to explain to students.

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Students would hard to identify which side is which kind of ion

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primary 3 students cannot imagine gas as circle in a paper, they may think gas as different size circles in different situations.

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Students find it hard to differentiate because they lack practical experience in plant biology