Question Video: Describing the Function of the Contractile Vacuole in 𝐴𝑚𝑜𝑒𝑏𝑎 and 𝐸𝑢𝑔𝑙𝑒𝑛𝑎 | Nagwa Question Video: Describing the Function of the Contractile Vacuole in 𝐴𝑚𝑜𝑒𝑏𝑎 and 𝐸𝑢𝑔𝑙𝑒𝑛𝑎 | Nagwa

Question Video: Describing the Function of the Contractile Vacuole in π΄π‘šπ‘œπ‘’π‘π‘Ž and πΈπ‘’π‘”π‘™π‘’π‘›π‘Ž

What is the function of the contractile vacuole present in both πΈπ‘’π‘”π‘™π‘’π‘›π‘Ž and π΄π‘šπ‘œπ‘’π‘π‘Ž?

02:42

Video Transcript

What is the function of the contractile vacuole present in both Euglena and Amoeba? (A) It collects and removes, excretes, excess water from the organism. (B) It digests the food that has been engulfed by the organism. (C) It controls the growth and reproduction of the organism. (D) It responds to light allowing the organism to find food. Or (E) it carries out photosynthesis, so the organism can make food.

Euglena and Amoeba are both unicellular, or single-celled, organisms. They must carry out all essential life processes within just one cell. For example, to obtain nutrition, Euglena cells are able to carry out photosynthesis as they have chloroplasts. Photosynthesis uses light energy and simple inorganic molecules to make food in the form of sugars. Amoeba cells cannot carry out photosynthesis as they do not have chloroplasts. But they are able to engulf food particles into their single cell.

Euglena cells can do this too when light levels are low. Once in the cell, food particles are contained within organelles called food vacuoles. There, these particles can be broken down into smaller, useful molecules. As digesting food that has been engulfed by the organism is the role of the food vacuole and not the contractile vacuole, option (B), which suggests otherwise, is incorrect.

We also now know that Amoeba cells cannot carry out photosynthesis. Therefore, option (E), which suggests this is the role of the contractile vacuole in both organisms, cannot be correct either.

As Amoeba cells do not carry out photosynthesis, they do not respond to light to find food. Option (D), which suggests responding to light is the function of the contractile vacuole, an organelle present in Amoeba and Euglena cells, is therefore also incorrect.

The instructions for controlling various life processes, such as growth and reproduction, are encoded by genetic material. In both Amoeba and Euglena cells, genetic material is found in an organelle called the nucleus. As we know that it is the role of the nucleus, not the contractile vacuole, to control growth and reproduction, option (C), which suggests otherwise, cannot be the correct answer.

The contractile vacuole is an organelle present both in the cells of Amoeba and Euglena. It is responsible for collecting and then excreting excess water. Therefore, the function of the contractile vacuole present in both Euglena and Amoeba is (A): it collects and removes, excretes, excess water from the organism.

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