GENERAL HISTOLOGY

Detailed explanation-1: -In some cases, the blades have a distinct midrib. Photosynthesis takes place primarily in the blades and it is, therefore, important that the stipe is long enough to place them sufficiently close to the surface of the water to reach the light.

Detailed explanation-2: -The function of the blade is for photosynthesis which is similar to land plants. The production of food is done there with a combination of sunlight energy and nutrients from the water. The gas bladder is used to be able to do maximum photosynthesis on the top surface. The stipe is for supporting the blades.

Detailed explanation-3: -Holdfast: This anchors the seaweed to the substrate. Stipe (st-eye-p): This stem-like structure connects the blade to the holdfast. The stipe is very flexible which allows the seaweed to flex and bend with wave action.

Detailed explanation-4: -The photosynthetic process in seaweeds, like in all photo-autotrophic plants, is driven by sunlight and uses CO2, which is thereby removed from the water, to form new biomass, which also requires a variety of minerals, and especially dissolved inorganic-phosphorus and ni-trogen (DIN and DIP).