AP BIOLOGY

Detailed explanation-1: -Plants can synthesise food for themselves but animals including humans cannot. They get it from plants or animals that eat plants. Thus, humans and animals are directly or indirectly dependent on plants. Plants are the only organisms that can prepare food for themselves by using water, carbon dioxide and minerals.

Detailed explanation-2: -All plants need space to grow, the right temperature, light, water, air, nutrients, and time.

Detailed explanation-3: -Since CO₂ is the main source of food for plants, increasing levels of it directly stimulate the photosynthetic rate of most plants.

Detailed explanation-4: -Plants are autotrophs, which means they produce their own food. They use the process of photosynthesis to transform water, sunlight, and carbon dioxide into oxygen, and simple sugars that the plant uses as fuel.

Detailed explanation-5: -Plants use photosynthesis to capture carbon dioxide and then release half of it into the atmosphere through respiration. Plants also release oxygen into the atmosphere through photosynthesis.