Question

Given below are a set of steps via which amoeba obtains nutrition. Arrange these steps in the correct sequence.

I. Complex substances are broken down into simpler ones.
II. Formation of a food vacuole.
III.Undigested material is moved to the surface of the cell and thrown out.
IV. Temporary finger-like projections of the cell surface fuse over the food particle.

• A. IV $\to$ I $\to$ II $\to$ III
• B. IV $\to$ II $\to$ I $\to$ III
• C. I $\to$ IV $\to$ II $\to$ III
• D. I $\to$ II $\to$ IV $\to$ III

Answer 1

The correct option is B

IV $\to$ II $\to$ I $\to$ III

• Amoeba first uses its finger like projections (pseudopodia) to get in close proximity to the food particle and then fuses with it, thereby engulfing the food particle leading to the formation of a food vacuole.
• 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 remaining undigested material is moved to the surface of the cell and is expelled.