- Show photographs or video clips of sperm and egg cells. Ask pupils to compare them and suggest how they are specially adapted for their functions. Ask pupils to draw and describe or annotate drawings of egg and sperm cells, identifying their main features.
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- identify and describe how sperm cells are adapted to their functions,
eg a tail that pushes it along; streamlining, by reduction in size through having less cytoplasm; a specially strengthened head that contains chemicals to penetrate and break down the outer layers of the egg
- identify and describe how egg cells are adapted to their functions,
eg an enlarged cell with food reserves
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