- Ventricles have thicker muscular walls than atria: Because ventricles pump blood to longer distances — the right ventricle pumps to the lungs and the left ventricle pumps to the entire body. This requires more force, so their walls are thicker and more muscular than the atria, which only pump blood into the ventricles.
- The transport system in plants is slow: Plants lack a heart-like pumping organ. Transport relies on passive processes like diffusion, transpiration pull, root pressure, and capillary action, making it slower compared to animals.
- Circulation of blood in aquatic vertebrates differs from that in terrestrial vertebrates: Aquatic vertebrates like fish have single circulation — blood passes through the heart only once per cycle. Terrestrial vertebrates have double circulation — blood passes through the heart twice, which allows efficient oxygenation and higher metabolic activity.
- During the daytime, water and minerals travel faster through the xylem as compared to the night: Because transpiration is higher during the day due to sunlight, more water evaporates from the leaves, creating a stronger transpiration pull that draws water and minerals upward faster.
- Veins have valves, whereas arteries do not: Veins carry blood at low pressure and often against gravity. Valves prevent the backflow of blood. Arteries carry blood at high pressure from the heart, so backflow does not occur and valves are unnecessary.
