Indicate true or false for each statement by writing the words true or false in the blanks. Certain plants contain compounds similar to ecdysone which serve as a defense against insects. Juvenile hormone levels are high in insect larvae, but must decrease in order for metamorphosis to occur. Chemicals similar to ecdysone and juvenile hormone are widely used commercially to control insect pests

Certain plants contain compounds similar to ecdysone which serve as a defense against insects. False

Juvenile hormone levels are high in insect larvae, but must decrease in order for metamorphosis to occur. True.

Chemicals similar to ecdysone and juvenile hormone are widely used commercially to control insect pests. True

Explanation:

The plants produce toxic chemicals such as terpenoids, alkaloids, anthocyanins, phenols, and quinones as a defense against insects. Juvenile hormone levels are high in insect larvae but its concentration decrease when the insect transform into adult stage and in order to  occur metamorphosis. Ecdysone and juvenile hormone are widely used as insecticide because it prevents the insects to transform from larva to adult so if they can't mature they can't harm the plants or other things of our environment.

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in