Digestion in Amoeba : NCERT / CBSE Notes
The term amoeba is derived from the Greek word amoibè, meaning change.The amoeba is one of the simplest, jelly-like animal ... the ultimate shape shifter. An amoeba is so minute that it can be seen only under a microscope. The amoeba belongs to the group Protozoa. Amoebae are found at the bottom of fresh water bodies like ponds and lakes, even in a gutter or muddy water. Some of them are also found in damp soil and food. The amoeba is a single-celled animal.
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- The amoeba is a microscopic unicellular organism. It is belongs to the group protozoa. The name comes from the Greek word amoibe, meaning change.
- The habitat of the amoeba is fresh water. The amoeba contains jelly-like cytoplasm. Inside the cytoplasm are cell organelles like the nucleus, food vacuoles and contractile vacuole.
- An amoeba takes in oxygen gives off carbon dioxide through the cell membrane by a mechanism of diffusion. It takes in oxygen dissolved in water.
- An amoeba can move all directions and can change its shape with the help of pseudopodia as a locomotory organ.
- An amoeba engulfs its prey along with a droplet of water with the help of pseudopodia, and then forms a food vacuole inside the cytoplasm.
- The prey can be killed and digested with the help of the digestive juice secreted by the food vacuole. The undigested food is thrown out by changing the shape of the body.
- Amoeba forms a cyst in unfavourable conditions.
- The amoeba has a jelly-like substance, called the cytoplasm, inside a flexible boundary called the cell membrane. Floating in the cytoplasm are various structures like the nucleus, food vacuoles and contractile vacuoles.
- An amoeba takes in dissolved oxygen from the surrounding water, and gives off carbon dioxide into the water through the cell membrane.
- An amoeba can move in all directions using temporary feet-like structures, called pseudopodia. An amoeba, with the help of pseudopodia, captures and engulfs its prey along with a droplet of water.
- In an amoeba, digestive juices convert food particles into simpler substances. The cytoplasm absorbs digested food directly, and uses it for growth, maintenance and multiplication.
- In the amoeba, undigested remains of food are thrown out of the body.
- An amoeba roll into a tiny ball called cyst during unfavourable conditions.