Statement-I: Diffusion is very important to plants.

Statement-II: It is the only means for gaseous movement within the plant body.

Statement I is true. Diffusion is very important to plants. It's the movement of molecules (such as gases) from areas of higher concentration to areas of lower concentration. In plants, diffusion is crucial for the exchange of gases like carbon dioxide and oxygen during processes like photosynthesis and respiration. It's how plants obtain carbon dioxide from the atmosphere and release oxygen.

Statement II is also true. Diffusion is a primary means of gaseous movement within plants. Plants have specialized structures for gas exchange, such as stomata in leaves and lenticels in stems. Stomata are small openings on the surface of leaves that can be regulated to control the exchange of gases, and lenticels are small openings in the bark of woody plants.