Name the class, then reject one word

Learning outcome

You can name a common class, test all four words, and explain why one word falls outside it.

Concepts and reasons

This lesson groups words by meaning. Use the category stated in the question. If none is stated, look for a clear shared property of three items, then check that the fourth does not have it. Keep the same rule for all four; do not invent a different reason for each item.

A rule must separate three from one. For apple, mango, grape and carrot, “foods” includes all four, so it does not decide the answer. In the usual food grouping, apple, mango and grape are fruits; carrot is a root vegetable. Carrot is outside the fruit group.

Worked examples

1. Apple, mango, grape, carrot. Group by the usual food categories. Test the proposed class “fruits”: apple fits, mango fits, grape fits, carrot does not. Answer: carrot. The edible part of a carrot is a root.
2. Wheat, rice, maize, gram. Group by crop type: cereals or pulses. Wheat, rice and maize are cereals; gram is a pulse. Answer: gram. Here gram means the crop चना, not the unit of mass. “Seeds used as food” is too broad because it includes all four.
3. Wheat, rice, gram, maize. The same crop rule still excludes gram. Moving it from fourth to third place changes its position, not its class.

Common traps

The last word is not automatically the answer. Word length and first letters can be valid rules in spelling-based questions, but they do not answer a question asking for a meaning-based category. The English words apple and ant both start with A/a; that shared letter does not make them the same kind of thing.

Do not treat an unstated rule as uniquely correct. If two equally reasonable rules give different answers, the question needs more context. In this lesson’s practice, the grouping basis is stated so that one answer is justified.

Practice questions

1. Using the usual food grouping, which is outside the fruit class: apple, mango, grape, carrot?
2. Grouping crops as cereals or pulses, which is outside the cereal class: wheat, rice, maize, gram?
3. A learner groups apple, mango, grape and carrot as “foods”. Does that rule identify one odd word? Explain.

Answers and explanations

1. Carrot. The other three are fruits in the stated food grouping; carrot is a root vegetable.
2. Gram. Wheat, rice and maize are cereals; gram (चना) is a pulse.
3. No. All four are foods. A useful odd-one-out rule must include three items and exclude one; this rule excludes none.

Analogy

Imagine a shelf labelled “fruits”. Apple, mango and grape belong on it; carrot belongs with root vegetables. First read the shelf label, then check every item against it. A shelf labelled only “foods” would hold all four and would not identify an odd item.

Quick reference

• Use the stated grouping basis and the same rule for every item.
• Test all four: three must fit the class and one must fail.
• Fruits versus a root vegetable: carrot is outside. Cereals versus a pulse: gram is outside.
• Position does not decide the answer. Spelling rules apply only when the question calls for them.
• If equally reasonable rules give different answers, more context is needed.