Science 3rd Grade A15

Some birds build their nests in tall trees. They choose these trees because they provide shelter from strong winds and predators. How do tall trees help these birds survive?

• Tall trees give the birds a place to hide from other animals.

• Tall trees provide food for the birds.

• Tall trees help the birds find mates.

• Tall trees protect the birds from heavy rain.

A certain type of tree grows in a desert region where there is little rainfall. These trees have deep roots that can reach underground water. How do these deep roots help the trees survive?

• The roots protect the trees from being eaten by animals.

• The roots help the trees find water during dry periods.

• The roots make the trees grow taller.

• The roots help the trees make more seeds.

Some plants are pollinated by wind instead of insects. These plants usually produce a large number of tiny seeds. Which situation will most likely cause a decrease in the number of these plants?

• More insects are introduced to the area.

• The plant's seeds are carried away by the wind.

• The plant’s flowers produce a strong fragrance.

• The area experiences heavy rain that washes away the seeds.

People can get vitamin C from citrus fruits like oranges, or from vegetables like broccoli. Vitamin C is important for keeping gums, skin, and muscles healthy. Which situation will most likely cause a person to have low vitamin C?

• The person eats a variety of fruits and vegetables.

• The person spends a lot of time outside in the sun.

• The person avoids foods that contain vitamin C.

• The person drinks orange juice daily.

The American bison lives in the grasslands of North America. A bison’s needs include:

grass for food

open space to roam

protection from predators like wolves

a place to rest during the day

A new housing development is being built in the grasslands where the bison live. How will this development most likely affect the bison?

• More bison will be able to find food.

• More bison will be able to rest during the day.

• Fewer bison will have enough space to roam and find food.

• Fewer predators will enter the area.

Sea otters are marine mammals found along the coasts of North America. They help maintain the balance of kelp forests by eating sea urchins, which are herbivores that graze on kelp. What effect is most likely caused by the decline in sea otter populations?

• The number of sea urchins decreases, allowing kelp forests to thrive.

• The populations of sea urchins increase, causing kelp forests to shrink.

• The number of fish in kelp forests increases because of less competition for food.

• The health of the kelp forests improves, leading to more fish.

The image shows two parent horses and their foal in a grassy field.
Which traits did the foal most likely inherit from its parents? Select the two correct answers.

• A white stripe on its face from its father

• A spotted coat pattern from its mother

• A solid coat color from both parents

• A white tail from its mother

• A completely different coat color from both parents