Suppose that you and your next door neighbor both have a small pond in your yard. Your pond is surrounded by abundant St. John's wort, but your neighbor's pond is surrounded by very little St. John's wort.

Based on what you learned from Knight's study, which of the following would be reasonable explanations for why your pond has abundant St. John's wort and your neighbor's pond does not? Select the four best answers.

Your neighbor has been applying fertilizer to the St. John's wort around his pond.

You have a bird house with dragonfly-eating birds near your pond.

Your pond has 100 fish, and your neighbor's pond has 50 fish.

Your neighbor's pond has a plant that competes with St. John's wort.

Your ponds have the exact same number of fish.

Your neighbor has been using herbicides to manage vegetation near his pond.

You have been spraying your pond with insecticides.

The four best answers are:

You have a bird house with dragonfly-eating birds near your pond. Your pond has 100 fish, and your neighbor's pond has 50 fish. Your neighbor's pond has a plant that competes with St. John's wort. Your neighbor has been using herbicides to manage vegetation near his pond

Answer: Option B, C, D and F

Explanation:

St. John's wort is scientifically termed as Hypericum perforatum and the reasons behind abundant St. John's wort in one pond than another pond are as follows:

As the aquatic larvae of dragonflies are consumed by fishes of the pond while adult dragonflies are consumed by many birds, flies and bees which in turn are supporting agents for pollination of shrub named St. John's wort. The variation in number of fishes in pond brings changes in abundance of dragonflies which affects the presence of pollinators therefore impact of such phenomenon may affect the reproductive health of plants like St. John's wort. As neighbor has been utilizing herbicides which is known as weedkiller, in order to manage vegetation near his pond is one of the major mistake.