Life Science

What is the first step that allows you to see an object?

• Light hits receptors at the back of your eyeball.

• Your brain processes signals from light receptors.

• Light is reflected from the object to your eyes.

Kate was watching a squirrel climb a tree on a sunny day. Why was she able to see the animal?

• Sunlight moved around the animal and into Kate's eyes.

• Sunlight traveled through the animal then into Kate's eyes.

• Sunlight changed direction when it struck the animal.

Which of these plant parts take in nutrients to help a plant grow?

• pistils

• flowers

• stamens

• root hairs

Which external structure of a rose functions in making seeds for reproduction?

• flower

• stem

• leaves

• roots

In which external structure of the rose does most food production take place?

• flower

• leaf

• stem

• roots

Annika got a potted plant for her birthday. As she looked at the plant, she noticed that it did not have flowers. How will this affect the plant?

• It will not be able to make food.

• It will not be able to take in water.

• It will not be able to produce seeds.

• It will not be able to carry water through its stems.

When a bird uses his beak to find a worm in the ground, he is using an external structure to get food.

• true

• false

Which of these structures helps an animal digest food?

• rib

• foot

• skull

• stomach

Which of these structures are most important for helping an elephant communicate with and keep track of other elephants?

• skin and ribs

• ears and feet

• skull and teeth

• liver and heart

Thorny lizards live in hot, dry climates. These animals have grooves on their bodies. How do these grooves most likely help these animals survive in their environment?

• They help them stay warm.

• They help them hide from rain.

• They help them collect water to drink.

• They help them find food.