1. The text states that every external structure has a specific "function." What is the best definition of a structure's function?
- A. The material the structure is made of
- B. The specific job it performs for survival
- C. The way the structure changes over the animal's lifetime
- D. The overall size and weight of the body part compared to the rest of the animal
2. A chameleon's ability to change its skin color allows it to blend in with its surroundings, making it harder for predators to see. This is an example of an external structure's function for...
- A. attracting a mate.
- B. regulating body temperature.
- C. hiding from danger.
- D. finding sources of water.
3. A snake flicks its tongue in the air to "taste" chemical particles, which helps it track prey. This behavior shows how an external structure...
- A. is used to build a nest or shelter for its young to keep them safe.
- B. can be used to gather sensory information that helps the animal find food.
- C. changes color to warn other animals that it is dangerous and should be avoided.
- D. is used primarily for communicating with other snakes over long distances.
4. In biology, what is the term for a specialized body part on the outside of an animal, such as a shell, feathers, or fins?
- A. Internal organ
- B. External structure
- C. Behavioral trait
- D. Life cycle
5. According to the principles of animal survival, why are sensory structures like eyes, ears, and noses so important?
- A. They are used primarily to attract mates.
- B. They make the animal look more appealing.
- C. They help the animal find shelter from rain.
- D. They gather critical information from the environment, allowing the animal to find food and avoid danger.
6. An animal like a fox or a rabbit has large, funnel-shaped ears. What is the primary advantage of this shape?
- A. It helps the animal maintain its balance while running quickly.
- B. The large surface area helps to regulate the animal's body temperature.
- C. It makes the animal appear larger and more intimidating to potential predators.
- D. It efficiently collects and directs sound waves toward the inner ear.
7. If you were to design a device to capture sunlight and focus it onto a solar cell, which biological structure would provide the best model for its basic design?
- A. The branching structure of a lung, used for gas exchange.
- B. The structure of an eye, with an opening (pupil) and a lens.
- C. A bird's wing, which is shaped to generate lift for flight.
- D. A fish's fin, which is designed for propulsion through water.
8. A bird has a very long, thin, and pointed beak. Based on the principle of structure and function, what is the LEAST likely use for this beak?
- A. Probing deep into flowers to drink nectar.
- B. Cracking open large, hard-shelled nuts.
- C. Pulling worms and insects out of small holes in the ground.
- D. Reaching into narrow crevices in tree bark to find bugs.
9. What is the fundamental principle connecting the shape of an animal's body part to its purpose?
- A. The shape of a body part is determined by the animal's diet alone.
- B. All sensory organs in an animal have the exact same shape for uniformity.
- C. The physical form of a structure is specifically adapted to its function.
- D. The size of an animal dictates the shape of all its body parts.
10. The principle that a structure's shape is tailored to its function is a direct result of which larger scientific process?
- A. The daily cycle of day and night.
- B. The process of cellular respiration.
- C. The constant circulation of water in the water cycle.
- D. Evolution by natural selection, which favors advantageous traits.