A Level Biology Practice Exam

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Master the A Level Biology Exam. Use flashcards and multiple choice questions with hints and explanations to ace your test. Start your journey to excellence!

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What is the primary role of a transport system in an organism?

To provide structural support
To transport required substances around the body
To initiate photosynthesis
To absorb nutrients from food

The correct answer is: To transport required substances around the body

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.