Biology 2e is designed to cover the scope and sequence requirements of a typical two-semester biology course for science majors. The text provides comprehensive coverage of foundational research and core biology concepts through an evolutionary lens. Biology includes rich features that engage students in scientific inquiry, highlight careers in the biological sciences, and offer everyday applications. The book also includes various types of practice and homework questions that help students understand—and apply—key concepts. The 2nd edition has been revised to incorporate clearer, more current, and more dynamic explanations, while maintaining the same organization as the first edition. Art and illustrations have been substantially improved, and the textbook features additional assessments and related resources.

By the end of this section, you will be able to do the following:

Explain in what way smell and taste stimuli differ from other sensory stimuli
Identify the five primary tastes that can be distinguished by humans
Explain in anatomical terms why a dog’s sense of smell is more acute than a human’s

Few people are aware of how crucial the sense of smell is to identifying foods, or the adaptive value of being able to identify a food as being familiar and therefore safe to eat. In this lesson and activity, students conduct an experiment to determine whether or not the sense of smell is important to being able to recognize foods by taste. The teacher leads a discussion that allows students to explore why it might be adaptive for humans and other animals to be able to identify nutritious versus noxious foods. This is followed by a demonstration in which a volunteer tastes and identifies a familiar food, and then attempts to taste and identify a different familiar food while holding his or her nose and closing his or her eyes. Then, the class develops a hypothesis and a means to obtain quantitative results for an experiment to determine whether students can identify foods when the sense of smell has been eliminated.

Become a detective to solve the case of the smelly backpack! Act out the clues and draw conclusions to solve the mystery.

When Detective Bentley cannot figure out why his backpack is smelly, he retraces the events in his day to find clues. Taking on the role of detectives, the viewers act out the events of Bentley’s day and use textual clues to solve the case.

Learning Objective:
Draw conclusions from the facts presented in text and support those assertions with textual evidence.

Conviértete en un detective para resolver el Caso de la Mochila con Mal Olor! Actúa las pistas y saca conclusiones para resolver el misterio.

Cuando el detective Bentley no puede entender por qué su mochila huele mal, recorre los acontecimientos de su día para encontrar pistas. Asumiendo el papel de detectives, los espectadores representan los eventos del día de Bentley y usan pistas textuales para resolver el caso.

Objetivo de Aprendizaje:
Sacar conclusiones de los hechos presentados en el texto y respaldar esas afirmaciones con evidencia textual.

This video introduces children to the five senses by following two young girls through their day at an apple orchard. Students watch and listen as the girls describe what they hear, see, feel, taste, and smell as they go on a tractor ride, walk through a petting zoo, and experience other fun activities that the orchard offers. [2:31] Support materials are provided.

This lesson describes the function and components of the human nervous system. It helps students understand the purpose of our brain, spinal cord, nerves and the five senses. How the nervous system is affected during spaceflight is also discussed in this lesson.

Discusses how the structures of the noseinteract to produce our sense of smell.Has links to lab activities and teacher lessonson this topic.

This lesson will describe how receptors allow you to detect smells and tastes and will describe the link between taste and smell. It is 1 of 2 in the series titled "Smell & Taste." [6:51]

Students conduct an experiment to determine whether or not the sense of smell is important to being able to recognize foods by taste. They do this by attempting to identify several different foods that have similar textures. For some of the attempts, students hold their noses and close their eyes, while for others they only close their eyes. After they have conducted the experiment, they create bar graphs showing the number of correct and incorrect identifications for the two different experimental conditions tested.