Describe biological processes(nutrition, excretion) in unicellular organisms.
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Answers
Excretion
The unicellular organism remove their wastes directly through the cell membrane by the process of diffusion. Diffusion occurs when particles spread. They move from a region where they are in high concentration to a region where they are in low concentration.
nutrition
Amoeba, is an unicellular organism which takes in food using temporary finger like projections of the cell which fuse over the food particle to form a food vacuole and the food is broken down inside the food vacuole and diffuse into cytoplasm.
Amoeba (source- self drawn )
The undigested food is taken to the cell surface and excreted.
Paramecium, another unicellular organism has a definite spot in the body to take in food.
Food is moved to the spot by the movement of hair like structure called cilia in the body of paramecium.
Nutrition in unicellular organisms takes place through pseudopodia and vacuoles.
Through their pseudo movements of cell membrane they engulf the food.
After digesting they excret out through food vacuoles.