Which example shows a method by which the plant as prey, is least effective against a predator?

Question

1. When touched, this plant's leaflets immediately close tightly.
2. When touched, this plant's leaves leave behind tiny stinging barbs.
3. When touched, this plant's thorns pierce the skin.
4. When eaten this plant releases chemicals that cause harm to the predator.

Answer 1

Hi, it would be the example of the leaves closing tightly. That could potentially shield the plant from some harm but wouldn't be much of a deterrent to predators eating the plant. The other examples would cause actual harm and work as better deterrents.