Common Assessment Review

Hawaii has many active volcanoes as a result of a hotspot on the ocean floor. How will succession impact the species diversity and populations of this area. Select all that apply.

• primary succession will cause an increase in both producer and consumer populations

• primary succession will cause species diversity to increase.

• secondary succession will cause species diversity to decrease

• primary succession will cause increase in producers, but decrease in consumers

After a disturbance, an ecosystem that had been inhabited has lost all animal species as well as most plant species. How will succession take place and what impact will it have? Choose 2 correct answers.

• secondary succession will restart from the existing plant species in the ecosystem but plant diversity will decrease.

• secondary succession will restart from the existing soil, nutrients and plant species in the ecosystem, plant diversity will increase

• primary succession will restart from existing soil, nutrients and plant species in the ecosystem; plant diversity will increase.

• once plant species diversity increases, animal populations that depend on the plant will recover.

Biologists are studying L. pulchella, an invasive snail species, because of its significant effect on clam populations in a marine ecosystem. L pulchella feed on clams and clams feed on algae. Which options describe how L pulchella impacts energy transfer and biodiversity throughout the marine ecosystem? Choose 2

• L. pulchella will not have prey so they will be able to compete against other species. The clam population will also increase and compete with native species. Biodiversity will increase

• L. pulchella will not have predators in the new environment so they can grow without limit and compete against native species. Clams will increase, biodiversity will increase.

• L. pulchella will not have predators in the new environment, they can grow without limit and compete against native species. This will decrease biodiversity and disrupt energy transfers in food web.

• L. pulchella will cause a decrease in the clam population, which will cause an increase in the algae population. This will decrease biodiversity and disrupt energy transfers in the food web.

How do primary and secondary succession affect species diversity after ecosystems are disrupted by human activity?

• Primary and secondary succession both cause an increase in species diversity, therefore making the ecosystem more stable

• Primary and secondary succession both cause a decrease in species diversity, therefore making the ecosystem less stable

• Primary and secondary succession both cause an increase in species diversity, therefore making the ecosystem less stable

• Primary succession causes an increase in species diversity and secondary succession causes a decrease in species diversity

The biodiversity of species impacts the stability and sustainability of ecosystems. A group of jaguars have ___ types of prey to hunt in order to survive without running out of food,

• multiple

• many

• a variety of

• abiotic

A population of giraffes has ___ types of plants for them to graze upon.

• multiple

• many

• a variety of

• abiotic

Even animals that compete for similar prey, like lions and cheetahs, have ___ options.

• multiple

• many

• a variety of

• abiotic

The animals also rely on ___ factors such as air and water to help them survive, which are sustainable natural resources.

• multiple

• many

• a variety of

• abiotic

The health of individual organisms is sustained by ___.

• biodiversity

• abiotic

• sustainably

• stable

An ecosystem with a lot of biodiversity uses ___ sources such as water.

• biodiversity

• abiotic

• stable

• food sources