An amoeba moving towards a crumb of cake in a pond most likely exhibits

Explanation

An amoeba is a tiny, single-celled organism that moves by extending and retracting its pseudopodia or false feet. The question is asking what the movement of an amoeba towards a crumb of cake in a pond is called. The answer is Option B, chemotaxis. Chemotaxis is the movement of an organism in response to a chemical stimulus. In this case, the chemical stimulus is the scent of the cake crumb that the amoeba is moving towards. The amoeba detects the scent using its sense of smell and moves towards the source of the scent. Phototropism (Option A) is a different type of movement where an organism moves towards or away from light. Thermotaxis (Option C) is movement in response to temperature changes, and nastic movement (Option D) refers to non-directional movement in response to a stimulus, usually involving changes in turgor pressure. It is important to note that amoebas do not have a sense of smell in the way that humans or other animals do. Instead, they are able to detect chemicals in their environment using specialized receptors on their cell surface. Overall, the movement of the amoeba towards the cake crumb is an example of chemotaxis, where the organism is moving in response to a chemical stimulus.