Sense Organs (Nose, Tongue & Skin)


Welcome to the section on Sense Organs. In this course material, we will delve into the fascinating world of sensory perception and the intricate structures that allow living organisms to interact with their environment through various senses.

Our first objective is to understand the structure and function of different sense organs. Sense organs are specialized structures responsible for receiving external stimuli and converting them into signals that can be interpreted by the brain. These organs include the eyes for vision, ears for hearing, tongue for taste, skin for touch, and the nose for smell.

Next, we will explore the process of perception of smell. The sense of smell, also known as olfaction, plays a crucial role in our daily lives, influencing our emotions, memories, and even appetite. We will study how odor molecules interact with sensory cells in the nose, triggering neural signals that are processed in the olfactory lobes of the brain.

Furthermore, we will identify the roles of sensory cells in the nose and olfactory lobes. Specialized sensory cells called olfactory receptors are responsible for detecting different odors and transmitting this information to the brain for interpretation. The olfactory lobes play a key role in processing these signals and generating the perception of smell.

As we progress, we will delve into the types of responses exhibited by organisms, namely taxis and nastism. Taxis refers to directed movement towards or away from a stimulus, while nastism involves non-directional responses to environmental factors. Understanding these responses is essential for survival and adaptation in various habitats.

Moreover, we will discuss environmental factors that evoke responses in organisms. Factors such as temperature, pH, light intensity, and humidity can elicit behavioral or physiological responses in living organisms, enabling them to cope with changes in their surroundings.

Lastly, we will analyze diseases that affect key organs involved in sensory perception, including the kidney, liver, nose, tongue, and skin. Diseases such as kidney failure, liver cirrhosis, olfactory disorders, taste disorders, and skin conditions can have profound effects on an individual's quality of life and overall health.

By exploring these concepts and objectives, we aim to gain a deeper understanding of how sense organs function, the process of smell perception, different types of responses in organisms, environmental factors that drive responses, and the impact of diseases on sensory organs. Let's embark on this exciting journey into the world of sense organs and sensory perception!


  1. Identify the roles of sensory cells in the nose and olfactory lobes
  2. Explain the process of perception of smell
  3. Examine the types of responses such as taxis and nastism
  4. Analyze diseases of the kidney, liver, nose, tongue, and skin
  5. Understand the structure and function of different sense organs
  6. Discuss environmental factors that evoke responses

Lesson Note

The human body is equipped with several sense organs that help us interact with and perceive our environment. Among these are the nose, tongue, and skin. Each of these organs has specialized sensory cells that detect different kinds of stimuli and send the information to the brain for processing.

Lesson Evaluation

Congratulations on completing the lesson on Sense Organs (Nose, Tongue & Skin). Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.

You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.

Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.

  1. The olfactory bulb is part of which sense organ? A. Nose B. Tongue C. Skin D. Liver Answer: A. Nose
  2. Which structure in the nose contains the sensory cells responsible for detecting smells? A. Olfactory bulb B. Olfactory lobe C. Taste buds D. Epithelial cells Answer: A. Olfactory bulb
  3. What is the process of perceiving smell called? A. Olfaction B. Gustation C. Audition D. Tactition Answer: A. Olfaction
  4. Which of the following is NOT a type of response in organisms? A. Taxis B. Nastism C. Stomata D. Phototropism Answer: C. Stomata
  5. Which environmental factor can trigger a response in organisms? A. Gravity B. Salinity C. Magnetism D. pH Answer: B. Salinity
  6. Which of the following is a disease that affects the liver? A. Asthma B. Cirrhosis C. Tuberculosis D. Malaria Answer: B. Cirrhosis
  7. Which sense organ is responsible for the sense of taste? A. Nose B. Tongue C. Ear D. Skin Answer: B. Tongue
  8. Which environmental factor can affect the response of organisms to their surroundings? A. Atmospheric pressure B. Humidity C. Oxygen levels D. Wind speed Answer: B. Humidity
  9. Which of the following is a disease that affects the kidney? A. Diabetes B. Arthritis C. Hypertension D. Glomerulonephritis Answer: D. Glomerulonephritis

Recommended Books

Past Questions

Wondering what past questions for this topic looks like? Here are a number of questions about Sense Organs (Nose, Tongue & Skin) from previous years

Question 1 Report

The diagram above is an illustration of some parts of a mammalian ear. Study it and answer this question.

The parts labelled I are the?

Question 1 Report

Which of the following structures in the ear is responsible for transmitting sound vibrations to the auditory nerve?

Question 1 Report

The following parts of the ear are involved in hearing EXCEPT

Practice a number of Sense Organs (Nose, Tongue & Skin) past questions