What is an amoeba? How does it move? Explain digestion in amoeba in detail. [5 MARKS]
What is an amoeba? How does it move? Explain digestion in amoeba in detail. [5 MARKS]
Definition: 1 Mark
Movement: 1 Mark
Digestion: 3 Marks
Amoeba is a microscopic single-celled organism found in pond water. Amoeba has a cell membrane, a round, dense nucleus and many small bubble-like vacuoles in its cytoplasm.
Movement:
Amoeba constantly changes its shape and position. It pushes out one or more finger-like projections, called pseudopodia or false feet for movement and capturing food.
Digestion:
1. Amoeba feeds on some microscopic organisms. When it senses food, it pushes out pseudopodia around the food particle and engulfs it. The food gets trapped in a food vacuole.
2. Digestive juices are secreted into the food vacuole. They act on the food and break it down into simpler substances. Gradually the digested food is absorbed. The absorbed substances are used for growth, maintenance, and multiplication.
3. The undigested residue of the food is expelled outside by the vacuole. The basic process of digestion of food and release of energy is the same in all the organisms.
Definition: 1 Mark
Movement: 1 Mark
Digestion: 3 Marks
Amoeba is a microscopic single-celled organism found in pond water. Amoeba has a cell membrane, a round, dense nucleus and many small bubble-like vacuoles in its cytoplasm.
Movement:
Amoeba constantly changes its shape and position. It pushes out one or more finger-like projections, called pseudopodia or false feet for movement and capturing food.
Digestion:
1. Amoeba feeds on some microscopic organisms. When it senses food, it pushes out pseudopodia around the food particle and engulfs it. The food gets trapped in a food vacuole.
2. Digestive juices are secreted into the food vacuole. They act on the food and break it down into simpler substances. Gradually the digested food is absorbed. The absorbed substances are used for growth, maintenance, and multiplication.
3. The undigested residue of the food is expelled outside by the vacuole. The basic process of digestion of food and release of energy is the same in all the organisms.
