Finch Population and Beak Depth

The video explores the impact of abundant rainfall on finch populations and their beak sizes. During years of heavy rain, plants produce more seeds, leading to an increase in finch numbers. The experiment shows that with more food available, finches thrive, and their beak depth decreases as large beaks are not necessary for survival. The video concludes that environmental changes can significantly affect animal populations and physical traits.

What happens to the environment during years of abundant rainfall?

• The number and variety of seeds decrease.

• The number and variety of seeds increase.

• The number of seeds remains the same.

• The variety of seeds decreases.

What is the initial setup for the experiment regarding rainfall?

• 25 inches of rain per year

• 15 inches of rain per year

• 10 inches of rain per year

• 20 inches of rain per year

How many finches were there at the start of the experiment?

• 1500 finches

• 1000 finches

• 2000 finches

• 500 finches

What was the average beak depth at the beginning of the experiment?

• 10.01 millimeters

• 9.01 millimeters

• 11.01 millimeters

• 8.01 millimeters

By the end of year five, what was the finch population?

• 1500 finches

• 1910 finches

• 2000 finches

• 2500 finches

What was the average beak depth after five years?

• 6.44 millimeters

• 9.44 millimeters

• 7.44 millimeters

• 8.44 millimeters

Why did the finch population increase during the experiment?

• The beaks grew larger.

• More food was available.

• The beaks grew smaller.

• Less food was available.

Why did the average beak depth decrease?

• Beak size did not affect survival.

• Larger beaks were needed for survival.

• Beaks grew larger due to more food.

• Smaller beaks were more efficient for the available seeds.

What is the relationship between rainfall and beak size?

• More rainfall leads to smaller beaks.

• Less rainfall leads to smaller beaks.

• More rainfall leads to larger beaks.

• Rainfall does not affect beak size.