AP 5th EVS Our Body - Our Organ Systems Workbook Answers

AP 5th EVS Our Body - Our Organ Systems Workbook Answers. APSCERT 5th Class EVS Our Body - Our Organ Systems the 4th Unit, Workbook Answers are explained worksheet wise in this article. Completed all Exercises of APSCERT 5th Unit 4 of EVS Workbook for Lesson" Our Body - Our Organ Systems".

4. Our Body – Our Organ Systems (Workbook Answers)

📘 WORKSHEET – 1 (Page 136–139) — Organs in our body & the skeletal system

I. Rewrite the following words two times.
(This is a handwriting practice exercise — students should copy each word twice in the given boxes: Organs, Internal organs, External organs, Machine, Together, Structures, Rib cage, Backbone, Cartilage, Skeleton.)

II. True (T) or False (F).

1. Organs are classified as internal and external based on their visibility (whether seen from outside or not), not functionality. — (F)
2. Some organs in our body do not have any functionality — they are just for beauty. — (F)
3. Only external organs work together to perform the body functions. — (F) (Both internal and external organs work together.)
4. The skeletal system supports our body movements with the support of muscles. — (T)
5. The protection of all body parts is an important function of bones. — (T)

III. Paragraph — answers:

1. Why is the brain important?
   The brain controls all our actions. It is very sensitive and essential for life, so it needs protection (by the skull).
2. Explain one activity that denotes the collective work of both internal and external organs.
   While eating food, our hands (external organs) pick up the food and put it in the mouth (external organ); then the stomach and intestines (internal organs) digest the food. This shows internal and external organs working together.
3. Why is it important to take care of both internal and external organs?
   Because both types of organs work together to keep our body alive and healthy. If either is damaged or not cared for, the body cannot function properly.
4. When will we stay fit and healthy?
   We stay fit and healthy when all our organs (internal and external) work properly and together, like the parts of a machine.

IV. Multiple Choice Questions.

1. Which option correctly matches an organ with its category? — (B) Lung – Internal organ
2. A student lists: heart, kidney, leg, liver. Which classification is correct? — (C) Heart, kidney and liver are internal; leg is external
3. How do bones help in body movements? — (C) Bones work together with muscles and joints to help movement
4. What is the main role of the rib cage? — (B) It protects the heart and lungs

V. Answer in two or three sentences.

1. Name the organ systems in the human body.
   The organ systems in the human body are: Skeletal system, Digestive system, Respiratory system, Circulatory system, Excretory system, and Nervous system.
2. Which organ system is responsible for movement of our body?
   The skeletal system, along with the muscles, is responsible for the movement of our body.

3. As our bones grow longer, what happens to our body? Explain.
As our bones grow longer, our height increases. This is because the skeletal system provides the framework on which our body grows.

VI. Answer in four or five sentences.

1. How is an internal organ different from an external organ? Explain.
   External organs are those that are visible from outside our body, such as the head, hands, legs, eyes, nose, and ears. They help us see, hold things, walk, and do many activities. Internal organs are located inside our body and are not visible from outside, such as the brain, heart, lungs, liver, and kidneys. They perform vital life functions like pumping blood, digesting food, and helping us breathe.
2. Explain the following four important functions of the human skeletal system (Support, Protection, Movement, Giving shape).
   Support: The skeleton forms a strong framework that supports our body and helps us stand erect.
   Protection: Bones protect our delicate internal organs — the skull protects the brain, and the rib cage protects the heart and lungs.
   Movement: Bones work together with muscles and joints to help us move our body.
   Giving shape: The skeleton gives a definite shape and structure to our body.

📗 WORKSHEET – 2 (Page 140–143) — Digestive system and getting energy

I. Rewrite the following words two times.
(Handwriting practice: Stomach, Digestion, Nutrients, Absorbable, Enzymes, Saliva, Oesophagus, Intestine, Rectum, Anus.)

II. True (T) or False (F).

1. The digestive system helps our body break down food into simple substances (not complex). — (F)
2. The mouth is the first part of the digestive system and the anus (not small intestine) is the last one. — (F)
3. Nutrients from digested food are absorbed mainly in the small intestine. — (T)
4. The large intestine helps absorb water and prepare waste for elimination. — (T)

III. Conversation — answers:

1. What happens to the food we eat in the mouth?
   In the mouth, our teeth chew and grind the food into smaller pieces, and the saliva softens it so that it can be swallowed easily.
2. What problems might occur if nutrients are not absorbed properly in the small intestine?
   If nutrients are not absorbed properly, our body will not get enough energy and nourishment, which can lead to weakness, poor growth, and health problems.
3. How would a lack of a balanced diet affect the working of the digestive system?
   A lack of balanced diet can weaken the digestive system, causing improper digestion, poor absorption of nutrients, and various health problems.

IV. Multiple Choice Questions.

1. Where are the nutrients absorbed into the blood? — (D) Small intestine
2. Which organ absorbs water from undigested food? — (C) Large intestine
3. The food pipe is also known as — (B) Oesophagus
4. What is the main duty of the stomach? — (C) Mix and break down food

V. Answer in two or three sentences.

1. Write the pathway of food in the digestive system.
   Mouth → Oesophagus (food pipe) → Stomach → Small intestine → Large intestine → Rectum → Anus.
2. Name all the organs of the digestive system.
   Mouth, Oesophagus, Stomach, Small intestine, Large intestine, Rectum, and Anus.
3. Draw and label the parts of the human digestive system.
   (Draw the digestive system diagram showing Mouth, Oesophagus, Stomach, Small intestine, Large intestine, and Anus as shown in the textbook.)

VI. Answer in four or five sentences.

1. After eating food, what happens to the food inside your body? Name the system involved.
   The digestive system is involved. After we eat, the food is chewed in the mouth and mixed with saliva. It travels through the oesophagus to the stomach, where it mixes with digestive juices. It then moves to the small intestine, where digestion is completed and nutrients are absorbed into the blood. The undigested food passes to the large intestine, where water is absorbed, and the remaining waste is stored in the rectum and released through the anus.
2. Why is it important to eat healthy food for the proper working of organ systems?
   Healthy food provides the nutrients our body needs for proper digestion, energy, and growth. Eating junk or unhealthy food can harm the digestive system and reduce nutrient absorption, affecting the working of other organ systems as well.

📙 WORKSHEET – 3 (Page 144–147) — Respiratory system and respiration process

I. Rewrite the following words two times.
(Handwriting practice: Breathing, Respiration, Windpipe, Lungs, Energy, Exhalation, Inhalation, Spongy, Oxygen, Carbon dioxide.)

II. Fill in the blanks.

1. The process of taking oxygen in and giving carbon dioxide out is respiration.
2. Taking air into the lungs is called inhalation.
3. Breathing out carbon dioxide from the lungs is called exhalation.

III. Paragraph — answers:

1. Name the main parts of the respiratory system mentioned in the paragraph.
   The main parts of the respiratory system are the nose, windpipe, and lungs.
2. Which system in our body works nonstop to keep us alive?
   The respiratory system works nonstop to keep us alive.
3. How do our cells use the oxygen we breathe?
   Our cells use the oxygen we breathe to release energy from food, which helps us move, think, and play.

IV. Multiple Choice Questions.

1. Which organs are part of the respiratory system? — (B) Nose, windpipe, lungs
2. What happens to the lungs during inhalation? — (C) They get enlarged
3. Which gas in inhaled air helps release energy from food? — (B) Oxygen
4. What is the process of breathing out called? — (C) Exhalation
5. Which gas is exhaled from the body after energy is released? — (B) Carbon dioxide and water vapour

V. Answer in two or three sentences.

1. How does the respiratory system help our body?
   The respiratory system takes in oxygen through breathing, which helps release energy from food inside our cells. It also removes carbon dioxide, a waste gas, from the body.
2. Compare the digestive system and the respiratory system.
   The digestive system breaks down food into nutrients that are absorbed into the blood, while the respiratory system takes in oxygen and removes carbon dioxide. Both systems work together — oxygen from the respiratory system helps release energy from the nutrients supplied by the digestive system.
3. Draw and label the parts of the human respiratory system.
   (Draw the diagram showing Nose, Windpipe (Trachea), and Lungs as shown in the textbook.)

VI. Answer in four or five sentences.

1. Describe the main parts of the human respiratory system and state one function of each part (Nose, windpipe, lungs).
   Nose: Air enters our body through the nose; it is the starting point of breathing.
   Windpipe (Trachea): It carries the air from the nose down to the lungs.
   Lungs: These are soft, spongy organs that fill with air when we inhale. Here, oxygen is absorbed into the blood and carbon dioxide is removed.
2. What happens to the air we breathe in? Explain how oxygen is used by the body and how carbon dioxide is sent out.
   The air we breathe in enters through the nose, travels down the windpipe, and reaches the lungs. Here, oxygen passes into the blood and is carried to the cells, where it helps release energy from food. This process produces carbon dioxide and water vapour as waste, which travel back to the lungs and are pushed out of the body during exhalation.

📕 WORKSHEET – 4 (Page 148–151) — Circulatory system and making a stethoscope

I. Rewrite the following words two times.
(Handwriting practice: Stethoscope, Heart, Arteries, Veins, Pulmonary, Blood vessels, Circulation, Deoxygenated, Ventricles, Haemoglobin.)

II. Match the following.

1 → D   |   2 → A   |   3 → B   |   4 → E   |   5 → C

1. Blood vessels → D) Means of transport of blood throughout the body.
2. Arteries → A) Oxygenated blood from heart to body parts (except to lungs).
3. Veins → B) Deoxygenated blood from body parts to heart (except from lungs).
4. Pulmonary arteries → E) Deoxygenated blood from heart to lungs.
5. Pulmonary Veins → C) Oxygenated blood from lungs to heart.

III. Mind map — answers:

1. Write the name of the organ that pumps blood.
   The Heart pumps blood.
2. State two functions of blood as shown in the diagram.
   Blood carries oxygen to cells and carries nutrients to cells. (It also removes wastes like carbon dioxide.)
3. Differentiate between arteries and veins based on their functions.
   Arteries carry oxygenated blood away from the heart to all parts of the body (except pulmonary arteries). Veins bring deoxygenated blood back from the body to the heart (except pulmonary veins).

IV. Multiple Choice Questions.

1. What are the main parts of the circulatory system? — (B) Heart, blood, and blood vessels
2. Why is the heart called a pump? — (D) It pushes blood to all parts of the body
3. What useful materials does blood carry to body cells? — (A) Oxygen and nutrients

V. Answer in two or three sentences.

1. Name the main parts of the human circulatory system and write one function each.
   Heart: Pumps blood to all parts of the body.
   Blood: Carries oxygen and nutrients to all body cells.
   Blood vessels (arteries & veins): Transport blood throughout the body.
2. Why does heartbeat increase after exercise?
   During exercise, our muscles need more oxygen and energy, so the heart beats faster to pump more oxygen-rich blood to the body.
3. Why do we need the circulatory system?
   We need the circulatory system because it transports oxygen and nutrients to all body cells and removes waste products like carbon dioxide, keeping our body healthy.

4. Draw and label the human heart.
(Draw the heart diagram showing Right atrium, Left atrium, Right ventricle, and Left ventricle as shown in the textbook.)

VI. Answer in four or five sentences.

1. Explain the interdependency of the circulatory system and digestive system.
   The digestive system breaks down the food we eat into simple nutrients. The circulatory system then absorbs these nutrients into the blood and transports them to all cells of the body to provide energy. Without digestion, there would be no nutrients for the blood to carry, and without circulation, the digested nutrients could not reach the cells. So, both systems depend on each other to keep the body nourished and energetic.
2. Place your hand on your chest and feel your heartbeat. Which organ are you feeling, and what are its functions?
   We are feeling the heart. The heart works like a motor pump, pumping blood to all parts of the body through blood vessels. It has four chambers — two atria and two ventricles — and makes the sound 'lub-dub' with every heartbeat.

📔 WORKSHEET – 5 (Page 152–155) — Excretory system & Nervous system

I. Rewrite the following words two times.
(Handwriting practice: Brain, Sweat glands, Kidneys, Abdomen, Eliminate, Waste material, Purification, Urine, Connection, Transmit.)

II. Fill in the blanks.

1. Removing the waste materials from our body is the duty of Excretory system.
2. Kidneys are the parts of our excretory system that filter blood.
3. Skin, Kidneys and Lungs are the excretory organs.

III. Conversation — answers:

1. What is the main difference between the waste removed by the lungs and the waste removed by the kidneys? — (C) Lungs remove gas waste (CO₂); kidneys remove liquid waste.
2. Why is it important for the waste to be thrown out of the body? — (B) To keep the body clean and healthy.
3. Both the skin and the kidneys help remove water from the body. How is the water removed by the skin different from the water removed by the kidneys?
   The skin removes water in the form of sweat, along with salts, mainly to cool the body. The kidneys remove water in the form of urine after filtering waste materials from the blood.

IV. Multiple Choice Questions.

1. Why do we sweat while playing? — (B) To cool the body
2. What may happen if waste is not removed from the body? — (C) The body becomes sick.
3. What is one main function of the nervous system? — (B) To help us think, feel, and respond to our surroundings

V. Answer in two or three sentences.

1. How do the lungs help remove waste from the body?
   The lungs remove carbon dioxide, a waste gas produced in our body, during the process of exhalation.
2. Why is the brain called an important organ? Explain.
   The brain is called an important organ because it controls all the actions of our body. It receives messages from our sense organs through nerves and helps us think, feel, understand, and respond to our surroundings.
3. Explain why all organ systems must work together.
   Each organ system performs a different vital function, and no single system can keep the body alive on its own. All organ systems must work together, like the parts of a machine, to keep our body healthy and functioning properly.

VI. Answer in four or five sentences.

1. Describe the main parts of the human circulatory system and explain the function of each part.
   Heart: Pumps blood to all parts of the body; has four chambers (two atria and two ventricles).
   Blood vessels: Arteries carry oxygenated blood from the heart to the body; veins carry deoxygenated blood back to the heart.
   Blood: Transports oxygen and nutrients to all cells, removes waste like carbon dioxide, fights disease-causing germs, and regulates body temperature.
2. What may happen if one organ system does not work properly? Explain with one example.
   If one organ system does not work properly, it affects the whole body's health, since all organ systems depend on one another. For example, if the digestive system does not work properly, food will not be broken down into nutrients, so the body will not get enough energy, leading to weakness and poor health.

📝 ASSESSMENT (Page 156–158)

I. Multiple Choice Questions.

1. Which of the following correctly defines an organ system? — (B) A group of organs working together to perform a common function
2. Which organ system helps in transporting oxygen and nutrients to all parts of the body? — (C) Circulatory system
3. Ravi ran fast for some time and started breathing heavily. Which organ system is mainly helping him get more oxygen at that time? — (B) Respiratory system
4. Meena ate food and later got energy to play. Which two organ systems worked together to help her get energy? — (B) Digestive and respiratory systems

II. Answer in two or three sentences.

1. Why are the skeletal system and muscles studied together when learning about body movement?
   Because bones alone cannot move on their own. Muscles are attached to the bones, and when the muscles contract and relax, they move the bones at the joints. So, the skeletal system and muscles work together to produce body movement.
2. The small intestine is long and coiled. How does this structure help in the digestion and absorption of nutrients?
   Being long provides a larger surface area and more time for digestion to complete and for nutrients to be fully absorbed into the blood. The coiled structure allows this long tube to fit compactly inside the abdomen while still retaining the food long enough for complete absorption.

III. Answer in four or five sentences.

1. During summer, your brother sweats a lot and becomes irritated while playing. How would you help him understand the importance and benefits of sweating?
   I would explain to him that sweating is the skin's natural way of cooling down the body. When we play in summer, our body temperature rises, and the sweat glands in our skin release sweat through tiny pores to cool us down. Sweating also helps remove excess water, salts, and waste from the body. This is a normal and healthy part of how our excretory system works, so instead of feeling irritated, he should feel glad that his body is protecting him from overheating.

IV. Answer in five or six sentences.

1. Draw and explain the human digestive system.
   (Draw the digestive system diagram showing Mouth, Oesophagus, Stomach, Small intestine, Large intestine, Rectum, and Anus.)
   The food we eat is first chewed by the teeth in the mouth and softened by saliva. It then travels down the oesophagus (food pipe) to the stomach, where it is mixed with digestive juices. The partly digested food moves to the small intestine, where digestion is completed and nutrients are absorbed into the blood. The undigested food then passes into the large intestine, where water is absorbed. The remaining waste is stored in the rectum and finally released from the body through the anus.
2. Our body is an amazing machine. How? Appreciate how different organ systems work together.
   Our body is truly an amazing machine because every organ system performs a special task, just like different parts of a machine. The digestive system digests our food, the respiratory system helps release energy from that food by supplying oxygen, the circulatory system transports oxygen and nutrients to every cell, the excretory system removes waste products from the body, and the nervous system controls and coordinates all these systems, helping us respond to our surroundings. All these systems work together smoothly and continuously to keep us alive, healthy, and active — which truly makes our body an amazing machine.