CBSE Class 4 Science Inside Your Body Worksheet

I. Fill in the blanks:

Question a). The process of changing food into a form in which it can be absorbed is called________________.
Answer: digestion
In simple words: Digestion breaks down food so our body can take in nutrients.

Exam Tip: Remember that absorption follows digestion in the alimentary canal.

Question b). ____________ helps in excretion of waste material from the body.
Answer: Kidney
In simple words: Kidneys filter waste and extra water from blood to make urine.

Exam Tip: Kidneys are the primary excretory organs in the human body.

Question c). Our heart beats ____________ times in a minute.
Answer: 72 (approximate resting rate)
In simple words: A healthy adult heart beats about 72 times per minute when resting.

Exam Tip: Note that heart rate increases during physical exercise.

Question d). ____________ carry pure blood from the heart to different parts of the body.
Answer: Arteries
In simple words: Arteries are blood vessels that transport oxygen-rich blood away from the heart.

Question a). The lungs are an important (internal/external) organ of the body.
Answer: internal
In simple words: Internal organs are located inside our body, hidden from view.

Exam Tip: Internal organs cannot be seen directly from the outside.

Question b). The (liver/brain) has control over every activity of the body.
Answer: brain
In simple words: The brain acts as the master control center for all body functions.

Exam Tip: The brain coordinates thoughts, memory, movement, and senses.

Question c). The job of the large intestine is to (digest food/throw out waste).
Answer: throw out waste
In simple words: The large intestine absorbs water and prepares solid waste for elimination.

Exam Tip: Most actual digestion and absorption of nutrients take place in the small intestine, not the large intestine.

Question d). The shape of our kidney is like a (pea/bean).
Answer: bean
In simple words: Kidneys have a characteristic bean-like shape.

Exam Tip: Recall that humans have a pair of bean-shaped kidneys in the lower back.

Question e). The large intestine is (wider/narrower) than the small intestine.
Answer: wider
In simple words: Despite being shorter in length, the large intestine has a wider diameter than the small intestine.

Exam Tip: Do not confuse length with width; the small intestine is long and narrow, while the large intestine is short and wide.

III. Make the correct sequence (order) of organs for the following:

Question a). Passage of air inside the body:
Lungs, Nose, Windpipe, ____________________________________________________________________
Answer: Nose, Windpipe, Lungs
In simple words: Air enters through the nose, travels down the windpipe, and reaches the lungs.

Exam Tip: Follow the path of inhalation sequentially from top to bottom.

Question b). Passage of food inside the body:
Stomach, Food pipe, Small Intestine, Mouth, Rectum, Large Intestine. ____________________________________________________________________
Answer: Mouth, Food pipe, Stomach, Small Intestine, Large Intestine, Rectum
In simple words: Food travels step-by-step through the entire digestive tract from ingestion to excretion.

Exam Tip: Memorize the alimentary canal order: Mouth -> Food pipe -> Stomach -> Small Intestine -> Large Intestine -> Rectum.

IV. One word answer:

Question 1). The sound of the heart while pumping blood is called________________________________________________
Answer: Heartbeat (Lub-dub)
In simple words: The rhythmic sound made by heart valves closing is called a heartbeat.

Exam Tip: A stethoscope is used by doctors to listen to this sound.

Question 2). Name the internal organ which is like a spongy bag filled with air.________________________________________________
Answer: Lungs
In simple words: Lungs expand and contract as they fill with air during breathing.

Exam Tip: Lungs are the main organs of the respiratory system.

Question 3). Name the long, coiled tube like structure of the digestive system.________________________________________________
Answer: Small intestine
In simple words: The small intestine is a long, folded tube where food is fully digested and absorbed.

Exam Tip: It is roughly 6 meters long in adults but tightly coiled inside the abdomen.

V. Give reason of the following:

Question 1). We breathe faster after a 100 m run.
Answer: During a run, our muscles work hard and require more energy and oxygen. To supply this extra oxygen, our lungs breathe faster.
In simple words: Exercise increases oxygen demand, making us breathe quicker.

Exam Tip: Always link increased physical activity to higher oxygen requirements by muscles.

Question 2). Brain is considered to be the most important organ of our body.
Answer: The brain controls all voluntary and involuntary actions, thoughts, feelings, and sense organs, acting as the control center of the entire body.
In simple words: Without the brain, no other body part can function or coordinate properly.

Exam Tip: Mention its role as the control center of the nervous system.

VI. Match the following columns:

Question VI. Match the following columns:
Answer:
(a) Lungs - Respiration
(b) Kidneys - Excrete waste
(c) Stomach - Digests food
(d) Heart - Circulates blood
(e) Brain - Control centre of body
In simple words: Each major organ performs a specific, vital life process.

Exam Tip: Memorize the primary function associated with each major internal organ.