bird migration

A species of migratory bird was observed over 5 years. Researchers tracked the average distance traveled in relation to food abundance:

Year Food     Availability (kg/area)     Migration Distance (km)

         2018                             50                       1,000

        2019                              45                       1,100

       2020                              40                       1,200

       2021                               35                       1,300

       2022                              30                       1,400

Question:

What relationship is shown between food availability and migration distance?

• A) Birds travel shorter distances when food is scarce.

• B) Birds travel longer distances when food is abundant.

• C) Birds travel farther as food becomes harder to find.

• D) There is no relationship between food and migration distance.

After urban areas expanded along a bird migration route, researchers observed that the birds began flying longer distances, avoiding the cities.What is the most likely reason for this change?

• A) Birds avoid urban areas due to fewer natural habitats and resting spots.

• B) Birds migrate further to explore new environments created by cities.

• C) Urban lights guide birds, encouraging longer routes

• D) Cities offer more food, so birds migrate further to gather supplies.

A small town near a lake has noticed that a species of migratory bird, which usually arrives in May, has started arriving in mid-April. The town relies on eco-tourism, with visitors coming to watch the birds during their peak season. However, local researchers have also observed that the insects the birds feed on haven’t adjusted their life cycle — they still emerge in May.

Question:

How might the earlier arrival of the birds affect both the bird population and the town's eco-tourism?

• A) The bird population might grow since they have more time to nest and breed, boosting eco-tourism.

• B) The birds might struggle to find food, leading to a decline in their numbers, which could hurt eco-tourism.

• C) The birds will adapt quickly, finding other food sources, so there will be no impact on the town’s tourism.

• D) The bird population will remain stable, but eco-tourism will increase since visitors will come earlier.

A town by Lake Silverwood relies on eco-tourism, with visitors coming each spring to watch the arrival of a migratory bird species. Normally, the birds arrive in May when their main food source — a type of insect — emerges.

Based on the graph, how has the bird population changed from 2019 to 2023?

• A) The population has increased steadily each year.

• B) The population has fluctuated but remained stable overall.

• C) The population has decreased each year.

• D) The population showed no significant change.

A town by Lake Silverwood relies on eco-tourism, with visitors coming each spring to watch the arrival of a migratory bird species. Normally, the birds arrive in May when their main food source — a type of insect — emerges.

If this trend continues, what is the most likely impact on the bird population by 2025?

• A.The population may increase as the birds adapt to earlier migrations.

• B) The population may continue to decline due to a growing mismatch with food availability.

• C) The population will stabilize as birds and insects eventually sync their timing.

• D) The bird population will remain unaffected by the timing mismatch.