Which statement best describes the relationship between humans and plants in terms of gas exchange during photosynthesis and respiration?

• A. Humans release carbon dioxide that plants need; plants provide oxygen that humans need.
• B. Humans absorb oxygen and release nitrogen, while plants absorb nitrogen and release carbon dioxide.
• C. Plants and humans both require only oxygen for survival.
• D. Both humans and plants release oxygen and absorb carbon dioxide.

Answer: (A)

Verified step by step guidance

1. Understand the processes of photosynthesis and cellular respiration: Photosynthesis is the process by which plants use sunlight, carbon dioxide (CO₂), and water (H₂O) to produce glucose (C₆H₁₂O₆) and oxygen (O₂). Cellular respiration is the process by which humans and other organisms use oxygen (O₂) to break down glucose (C₆H₁₂O₆) into carbon dioxide (CO₂), water (H₂O), and energy (ATP).
2. Identify the gas exchange in humans: During cellular respiration, humans inhale oxygen (O₂) and exhale carbon dioxide (CO₂). This is a critical process for energy production in human cells.
3. Identify the gas exchange in plants: During photosynthesis, plants absorb carbon dioxide (CO₂) from the atmosphere and release oxygen (O₂) as a byproduct. This occurs in the chloroplasts of plant cells.
4. Recognize the interdependence between humans and plants: Humans release carbon dioxide (CO₂) through respiration, which plants use for photosynthesis. In turn, plants release oxygen (O₂) during photosynthesis, which humans need for respiration. This creates a complementary relationship between the two.
5. Evaluate the given statements: Based on the understanding of gas exchange and the interdependence between humans and plants, the correct statement is: 'Humans release carbon dioxide that plants need; plants provide oxygen that humans need.' The other options are incorrect because they either misrepresent the gases exchanged or the requirements of humans and plants.