Edexcel GCSE Biology key terms

Waist circumference divided by hip circumference, using the same unit for both measurements; it indicates how body fat is distributed.

Spread of a pathogen through water that someone drinks or uses to prepare food.

The continuous movement of water between the atmosphere, land, living organisms and bodies of water.

A layer of wax on the outside of a leaf that forms a barrier to pathogen entry.

A plant adapted to survive where water is scarce.

A disorder caused by a recessive allele located on the X chromosome.

Transport tissue that carries water and dissolved mineral ions to leaves.

The amount of crop or other agricultural product produced, often measured per unit area.

A clear area around a treatment disc on an inoculated agar plate where visible bacterial growth has been prevented.

The diploid cell formed at fertilisation when the nuclei of two gametes fuse.