Deficiency of potassium iodide causes goitre in human beings.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The statement claims that a deficiency of potassium iodide causes goiter in human beings. We need to determine if this is true or false.

2. **Defining Goiter**: Goiter is a condition characterized by the swelling of the thyroid gland, which is located in the neck. This swelling occurs due to a deficiency of iodine in the body.

3. **Identifying the Cause**: The thyroid gland requires iodine to produce thyroid hormones. When there is not enough iodine in the diet, the thyroid gland enlarges in an attempt to capture more iodine from the bloodstream, leading to the formation of goiter.

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