Multiple choice questions HOTS XXII — task. Science CBSE, Class 9.

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1. Diffusion is the process by which a substance moves from an area of ___________.

low concentration to a region of high concentration
high concentration to a region of high concentration
low concentration to a region of low concentration
high concentration to a region of low concentration

2. The flexibility of the plasma membrane can be contributed to the presence of ___________.

lipids and vitamins
proteins and lipids
proteins and carbohydrates
nucleic acids and lipids

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