Online worksheet ยท 1 of 4
Follow a question at each branch - Online practice 1
Read the information, then answer the questions. An adult may read the instructions aloud. Show your working where asked.
Read before answering
Key for exactly three supplied cards: A=ant, B=spider, C=snail. First ask 'Does it have legs?' NO leads to C. YES leads to 'Does it have six legs?' YES leads to A; NO leads to B. Use this fully stated model, not unidentified living animals. A proposed extra card, woodlouse, is specified to answer YES then NO, like B. A key must be tested with every included item.
Worksheet preview
- Which route identifies ant in this three-card key?
- Which route identifies spider, and which identifies snail?
- If the specified woodlouse card is added, does the existing key still identify every card uniquely?
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