Answers

Sperm is small- Enables it to move better (1) More energy efficient (1).
An acrosome has a specific job, acrosome contains digestive enzymes which break down the zona pellucida (1). Whereas a lysosome generally breaks down unwanted organelles (1).
The ovum releases chemicals which attract the sperm (1) Sperm follow concentration gradient of the chemical (1) Swim towards high concentration of the chemicals by the ovum (1).
46 chromesomes (23 pairs)
Where the acrosome swells and releases digestive enzymes which break down the zona pellucida (1).
Where lysosomes release chemicals which thicken the zona pellucida prevent further sperm from entering the ovum (preventing polyspermy) (1).
The flagellum enables the sperm to move (1).
Meiosis (1).
Egg is big, because it needs to be able to be wafted along the uterus (by cillia) (1).

	Created by Nathan Butler almost 8 years ago

A level Biology Note on Gametes and fertilisation, created by Nathan Butler on 20/02/2017.