Question

When the food particle passively sinks into the body of Amoeba through plasmalemma it is called as

• A. Import
• B. Invagination
• C. Circumvallation
• D. None of the above

Answer 1

Answer: (A)

Import

Following methods of ingestion are employed according to the nature of food particles:

1. Invagination: In this method, the ectoplasm and plasmalemma invaginate into the endoplasm to form a small canal as soon as it comes in contact with the food. Later, the food particles slip into the tube along with water and the mouth or opening of the tube is then closed.

2. Import: In this method, the food itself embeds into the cytoplasm of Amoeba as soon as it comes in its contact.

3. Circumvallation: Amoeba has to produce many pseudopodia for ingesting a motile food particle like ciliates and flagellates. When it approaches near food-particle, the part immediately in line with it stops moving and pseudopodia form a cup-like structure, the food cup around the food particle.

Thus, the correct answer is option A.