Question

read the text.
some flowering plants adjust their scents to aid in survival. for example, the brassica rapa plant in the turnip family has a floral fragrance that helps the plant attract pollinators. as a consequence, the plant attracts caterpillars that feed on it as well. if a caterpillar infestation occurs, the turnip plant decreases its floral scent using special scent signals in its leaves. a decrease in floral fragrance results in the plant becoming more attractive to parasitic wasps. these wasps kill the caterpillars, helping the plant to survive.
match causes with their effects.
the plant decreases its floral fragrance. the plant has a floral fragrance.
cause
effect
the plant attracts caterpillars.
the plant attracts parasitic wasps.

Explanation:

The text states that when the plant has a floral fragrance, it attracts pollinators but also caterpillars. When the plant decreases its floral scent (using special scent signals in its leaves), it becomes more attractive to parasitic wasps. So, we match the cause - effect based on the text's description.

Answer:

Cause: The plant has a floral fragrance. Effect: The plant attracts caterpillars.
Cause: The plant decreases its floral fragrance. Effect: The plant attracts parasitic wasps.