Ecology 🌎

1. What is the key difference between primary and secondary succession?

• 1. Primary succession begins after an ecological disturbance, secondary succession begins on bare rock.

• Primary and secondary succession lack any significant differences.

• Primary succession begins on bare rock and secondary succession begins after an ecological disturbance.

• 1. Both primary succession and secondary succession begin on nutrient rich soil.

Answer explanation

Primary succession = bare rock and lichen, no previous life. No other organisms are present. Secondary succession = still has soil and seeds. Occurs in places where life existed, yet was disrupted by an ecological disturbance.

Tags

13D

1. Which best defines a population?

• All the organisms in an ecosystem

• 1. All the animals that share similar anatomical features

• All the animals that acquire resources through similar methods

• All the interbreeding members of a certain species in an ecosystem

Answer explanation

A group of individuals of the same species living and interbreeding within a given area.

Tags

13D

What would immediately happen if the deer population was removed from the food web?

• Population of the hawks would increase.

• Population of the mountain lion would increase.

• 1. Population of the bark beetles would increase.

• Population of the mountain lion would decrease.

Answer explanation

Deer are the prey of the mountain lion. Therefore, if there are less deer available, less mountain lions can be supported by the decrease in their food source.

Tags

13B

1. A lion and a hyena compete for the same food source, a gazelle. What is the relationship between the hyena and gazelle?

• Competition

• Commensalism

• 1. Predator-Prey

• Mutualism

Answer explanation

1. The hyenas food source is the gazelle. This indicates that the hyena is the predator and the gazelle is the prey.

Tags

13B

3. If the amount of energy at the primary consumer level is 5,000 kcal, how much energy do the lions have?

• 500 kcal

• 50 kcal

• 5 kcal

• 0.5 kcal

Answer explanation

2. The primary consumer is the zebra with 5,000 kcal of energy. All you have to do is move the decimal. The secondary consumer is the hyena which would have 500 kcal of energy. After moving the decimal again, the tertiary consumer (lion) would have 50 kcal of energy.

Tags

13B