Body Systems and Senses — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
We hear sounds with our nose.
Corrected: We hear sounds with our ears.
In Grade 4 science, the ears are the sense organs that detect sound. The nose is the organ for smell, not hearing.
2. Fix the sentence:
Our tongue helps us see colors.
Corrected: Our eyes help us see colors.
Grade 4 students learn that eyes detect light and color. The tongue is for taste, not sight.
3. Fix the sentence:
Skin is the organ that lets us taste food.
Corrected: The tongue is the organ that lets us taste food.
Taste buds on the tongue sense flavors. Skin is the organ for touch in Grade 4 science.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. The sense of smell uses our nose.
Grade 4 science teaches that the nose contains smell receptors that detect odors in the air.
2. We use our skin to sense touch, pressure, and temperature.
In Grade 4, students learn that skin is the largest sense organ and detects touch all over the body.
3. Light enters our eyes so we can see objects around us.
Grade 4 science explains that eyes collect light and send signals to the brain to form images.
4. Taste buds on our tongue help us tell sweet foods from sour ones.
The tongue holds taste buds that detect sweet, sour, salty, and bitter flavors in Grade 4 science.
Part C: Short Answer
Answer each question in one or two complete sentences.
1. Name the five senses and the sense organ used for each.
Sample answer: The five senses are sight (eyes), hearing (ears), smell (nose), taste (tongue), and touch (skin). Each organ detects a different kind of information from the world around us.
Grade 4 students should match each sense to its main sense organ as a foundation for studying the human body.
2. Why do we say skin is a sense organ in Grade 4 science?
Sample answer: Skin is a sense organ because it has nerves that detect touch, pressure, heat, cold, and pain. These signals travel to the brain so we know what is touching us.
Grade 4 learners discover that skin senses many kinds of information, making it the largest sense organ in the body.