Haemoglobin, a respiratory pigment in red blood cells, has a high affinity for oxygen, facilitating its transport from the lungs to oxygen-deficient tissues.

Diffusion pressure alone becomes insufficient for oxygen delivery to all body parts in large animals.

Gaseous exchange occurs across the surface of stems, roots, and leaves, ensuring efficient gas exchange for photosynthesis and other plant processes.

Guard cells regulate the opening and closing of stomatal pores; they swell with water, causing the pore to open, and shrink to close it, controlling gas exchange and water loss.

The opening and closing of stomatal pores, regulated by guard cells, control gaseous exchange, preventing excessive water loss while facilitating the intake of carbon dioxide for photosynthesis.

The plant obtains carbon dioxide through tiny pores called stomata present on the surface of leaves.

In humans, some of the energy derived from the food we eat is stored in our body in the form of glycogen.

Carbohydrates are utilized for providing energy to the plant, and when not used immediately, they are stored as starch, serving as an internal energy reserve.

Carbon dioxide and water are taken in during photosynthesis, and they are converted into carbohydrates in the presence of sunlight and chlorophyll, serving as stored energy.

Photosynthesis fulfills the carbon and energy requirements of autotrophic organisms.