HORTICULTURE

Detailed explanation-1: -Oxygen and carbon dioxide are transported through tiny holes (pores) on the surface of leaves and stems through a network of air spaces within the plant to and from all living cells.

Detailed explanation-2: -During photosynthesis, the plant produces oxygen as a byproduct and hence the concentration of oxygen inside the cell is higher than the outer environment. Plant releases oxygen in external environment through diffusion process.

Detailed explanation-3: -Oxygen molecules are small, and all cells need it for respiration to release energy from food molecules. Because there’s a higher concentration of oxygen molecules outside the cell compared to the cell’s cytoplasm, you’ll see that oxygen diffuses into the cell along this concentration gradient.

Detailed explanation-4: -Normal human blood contains enough haemoglobin to transport about 0.2 millilitres of oxygen per millilitre of blood. The amount of oxygen bound to haemoglobin is determined by the partial pressure of oxygen in the lungs. Oxygen is transported from alveoli to tissue in the form of Oxyhaemoglobin.