Some protozoa are referred to as \"plant-like\" while others are referred to as
ID: 33673 • Letter: S
Question
Some protozoa are referred to as "plant-like" while others are referred to as "animal like". Of the three protozoans examined in this in which protists are "plantlike" and which are "animal-like"; briefly explain your reasons for your classification of these organisms in the space provided in Table 4. Table 4. Comparison of nutritional behaviour among protists. Nutritional Behaviour organism (plant-like animal-like) Reason Euglena Paramecium Blepharisma Amoeba Examination of the Structural Differences among DiatomsExplanation / Answer
Answer:
Euglena are mixotrophs meaning that they are both autotrophs and heterotrophs. This is possible because of the animal and plant like characteristics Euglena has. The choloroplast in Euglena gives it the ability to provide nutrients for itself through the process of photosynthesis.
Euglena is usually around green algae which is their other food source. Whenever there is a lot of algae around Euglena will always be there to enjoy their constant source of nutrients. With the ability to surround and absorb other organisms for food the Euglena is never short on nutrients which is why it is such a successful organism. Euglena can always find a food source.
Paramecia feed on microorganisms like bacteria, algae, and yeasts. To gather its food, the paramecium uses its cilia to sweep the food along with some water into the cell mouth after it falls into the oral groove. The food goes through the cell mouth into the gullet, which is like the stomach. When enough food has accumulated at the gullet base, it invaginates there to form a food vacuole in the cytoplasm, and travels through the cell, through the back end first. As it moves along, enzymes from the cytoplasm enter the vacuole to digest the contents, digested nutrients then going into the cytoplasm, and the vacuole shrinks. When the vacuole reaches the anal pore, it ruptures, expelling its waste contents to the exterior.
Amoeba eats tiny plants and animals present in pond water where it lives. An Amoeba takes in food by extending arm-like structures called pseudopodia from any part of its body, since it is shapeless.
When a food particle comes near the Amoeba, then the Amoeba produces two pseudopodia around the food particle and surrounds it.
The two pseudopodia then join around the food particle and trap it in a food vacuole with a little water. The food vacuole contains digestive enzymes which break down the food into nutrients and undigested waste.
The nutrients from the food are directly absorbed by the body of the Amoeba, the Cytoplasm. The undigested wastes are simply thrown out of the body through a rupture anywhere in the cell wall. After the nutrients are absorbed, the vacuole disappears.
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