Ace A Level Biology 2025 – Dive Deep and Conquer Science!

The primary role of a transport system in an organism is to transport required substances around the body. This includes the movement of essential materials such as oxygen, nutrients, hormones, and waste products to and from cells, ensuring that all parts of the organism function efficiently. For example, in animals, the circulatory system plays a crucial role in distributing oxygen absorbed from the lungs to the cells for respiration, while also collecting carbon dioxide and other waste products to be expelled from the body. In plants, the vascular system transports water and nutrients absorbed from the soil to various parts of the plant, demonstrating the importance of a transport system in maintaining homeostasis and supporting metabolic activities.

The other options address different functions: structural support is more related to the skeletal or cellular structure, photosynthesis is a process specific to plants for converting light energy into chemical energy, and nutrient absorption typically refers to processes occurring in the digestive system rather than overall transport within an organism.