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Questions and Answers
What is the function of the contractile vacuole in Amoeba?
Where is the ectoplasm located in an Amoeba cell?
What is the role of endoplasm in an Amoeba cell?
How does chemotaxis influence the movement of Amoeba?
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What causes the movement of Amoeba in a specific direction?
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How is feeding in Amoeba primarily carried out?
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What happens to undigested food in Amoeba?
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How does reproduction occur in Amoeba?
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What is the role of lysosomes in the feeding process of Amoeba?
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What happens when Amoeba reaches a certain size during reproduction?
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Study Notes
Contractile Vacuole Functions
- Regulates osmotic pressure by expelling excess water from the cell.
- Maintains internal fluid balance, preventing swelling or bursting of the cell.
Ectoplasm Location
- Ectoplasm is found just beneath the cell membrane, surrounding the endoplasm.
- Responsible for maintaining cellular shape and structure.
Role of Endoplasm
- Contains organelles and is the site for metabolic activities.
- Facilitates movement and locomotion through pseudopodia formation.
Chemotaxis Influence
- Chemotaxis allows Amoeba to move toward or away from chemical stimuli in the environment.
- Positive chemotaxis leads Amoeba toward nutrients, while negative chemotaxis directs it away from harmful substances.
Directional Movement
- Movement in a specific direction is influenced by gradients of chemicals in the surroundings.
- Pseudopodia extend and retract toward favorable conditions or food sources.
Feeding Process
- Feeding is primarily conducted through phagocytosis, where Amoeba engulfs food particles.
- The organism surrounds food with pseudopodia, forming a food vacuole.
Undigested Food
- Undigested food remains inside the vacuole until it is expelled from the cell.
- Excretion of waste occurs through the cell membrane once digestion is complete.
Reproduction
- Amoeba reproduces asexually through binary fission.
- The cell divides into two genetically identical daughter cells.
Lysosomes' Role in Feeding
- Lysosomes contain digestive enzymes that break down engulfed food within food vacuoles.
- They convert complex molecules into simpler forms that can be absorbed by the cell.
Size and Reproduction
- When reaching a certain size, Amoeba prepares for binary fission.
- Growth triggers internal processes that lead to cell division.
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Description
Take this quiz to test your knowledge of the structure of amoeba, a free-living eukaryotic organism that feeds on bacteria and other organisms in water. Learn about its unique cell structure, including the composition of ectoplasm and endoplasm.
