What is the process of combining male and female sex cells called?

The diagram illustrates a process where a "Male Sex Cell" and a "Female Sex Cell" undergo a "combining" step. This combined entity then goes through "Growing" to form a "Seed".

The question asks for the specific biological term for the "process of combining male and female sex cells".

• A. Pollination: This is the transfer of pollen from the anther to the stigma in flowering plants. It is a step that precedes the combination of sex cells but is not the combination itself.
• B. Fertilisation: This is the fusion of male and female gametes (sex cells) to form a zygote. This directly matches the "combining" step shown in the diagram and is the process that leads to the development of a seed.
• C. Photosynthesis: This is the process by which plants convert light energy into chemical energy (food). It is unrelated to reproduction.
• D. Transferring: This is a general term for moving something from one place to another. While sex cells might be transferred, it is not the specific biological term for their fusion.

The process of combining male and female sex cells is called fertilisation.

The final answer is $\text{B}$