Term 2 · Class 6 Science · Chapter 6

Samacheer Class 6 Science - Human Organ Systems

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Chapter-wise textbook exercise answers for Human Organ Systems with validation-aware solutions.

Answers marked verified were checked during generation against the chapter context and source question text.
Sections in this chapter
I. Choose the correct answer: 3II. Fill in the Blanks 1III. True or False. If False, give the correct answer. 1V. Arrange in the correct sequence 2VI. Analogy 1VII. Give a Very short answer: 7VIII. Give a short answer: 3IX. Answer in detail: 2X. Questions based on Higher Order Thinking Skills 4I. Choose the right answer: 5IV. Arrange in the correct sequence 2V. Analogy 1VI. Very Short Answer: 2
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1I. Choose the correct answer:3 questions
Q.1The circulatory system transports these throughout the bodyv
  1. A. Oxygen
  2. B. Nutrient
  3. C. Hormones
  4. D. All of these
Solution

(d) All of these

Answer:

(d) All of these

Q.2Main organ of respiration in human body isv
  1. A. Stomach
  2. B. Spleen
  3. C. Heart
  4. D. Lungs
Solution

(d) Lungs
Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems

Answer:

(d) Lungs
Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems

Q.3Breakdown of food into smaller molecules in our body is known asv
  1. A. Muscle contraction
  2. B. Respiration
  3. C. Digestion
  4. D. Excretion
Solution

(a) Digestion

Answer:

(a) Digestion

2II. Fill in the Blanks1 questions
Q.G1A group of organs together make up an ………. system. The part of the skeleton that protects the brain is ………… The process by which the body removes waste is ……….. The ………. is the largest sense organ in our body. The endocrine glands produce chemical substances called …………v
Solution

Organ
Skull
Excretion
Skin
hormones

Answer:

Organ
Skull
Excretion
Skin
hormones

3III. True or False. If False, give the correct answer.1 questions
Q.G2Blood is produced in the bone marrow. All the waste products of the body are excreted through the circulatory system. The other name of the food pipe is an alimentary canal. Thin tube-like structures which are the component of the circulatory system are called blood vessels. The brain, the spinal cord, and nerves form the nervous system.v
Solution

False – RBC’s are produced in the bone marrow.
False – All the waste products are transported through the circulatory system.
False – The other name of the digestive tract is an alimentary canal.
True
True

Answer:

False – RBC’s are produced in the bone marrow.
False – All the waste products are transported through the circulatory system.
False – The other name of the digestive tract is an alimentary canal.
True
True

4V. Arrange in the correct sequence2 questions
Q.1Stomach → Large intestine → Oesophagus → Pharynx → Mouth → Small Intestine → Rectum → Anusv
Solution

Mouth → Pharynx → Oesophagus → Stomach → Small intestine → Large intestine → Rectum

Answer:

Mouth → Pharynx → Oesophagus → Stomach → Small intestine → Large intestine → Rectum

Q.2Urethra → Ureter → Urinary Bladder → Kidneyv
Solution

Kidney → Ureter → Urinary bladder → Urethra

Answer:

Kidney → Ureter → Urinary bladder → Urethra

5VI. Analogy1 questions
Q.G3Arteries : Carry blood from the heart:: ……….. : Carry blood to the heart. Lungs : Respiratory system :: ……….. : Circulatory system. Enzymes : Digestive glands :: ………… : Endocrine glandsv
Solution

Veins
Heart
Hormones

Answer:

Veins
Heart
Hormones

6VII. Give a Very short answer:7 questions
Q.1Describe the skeletal system.v
Solution

The skeletal system consists of bones, cartilages and joints.
Bones provide a framework for the body.
Bones along with muscles help in movements such as walking, running, chewing and dancing etc.

Answer:

The skeletal system consists of bones, cartilages and joints.
Bones provide a framework for the body.
Bones along with muscles help in movements such as walking, running, chewing and dancing etc.

Q.2Write the functions of epiglottis?v
Solution

It prevents the entry of food into the windpipe.
It opens when the air enters the windpipe.

Answer:

It prevents the entry of food into the windpipe.
It opens when the air enters the windpipe.

Q.3What are the three types of blood vessels?v
Solution

Arteries
Veins
Capillaries
Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems

Answer:

Arteries
Veins
Capillaries
Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems

Q.4Define the term “Trachea”v
Solution

The trachea commonly called “Windpipe” is a tube supported by cartilaginous rings.
It connects the pharynx and larynx to the lungs.
Allowing the passage of air.

Answer:

The trachea commonly called “Windpipe” is a tube supported by cartilaginous rings.
It connects the pharynx and larynx to the lungs.
Allowing the passage of air.

Q.5Write any two functions of the digestive system.v
Solution

The digestive system is involved in the conversion of complex food substances into simple forms.
Absorption of digested food.

Answer:

The digestive system is involved in the conversion of complex food substances into simple forms.
Absorption of digested food.

Q.6Name the important parts of the eye? Three main parts.v
Solution

Cornea
Iris
Pupil

Answer:

Cornea
Iris
Pupil

Q.7Name the five important sense organs.v
Solution

Eyes
Ears
Nose
Tongue
Skin

Answer:

Eyes
Ears
Nose
Tongue
Skin

7VIII. Give a short answer:3 questions
Q.1Write a short note on the rib cage.v
Solution

The rib cage is made up of 12 pairs of curved, flat rib bones.
It protects the delicate vital organs such as the heart and lungs.
Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems

Answer:

The rib cage is made up of 12 pairs of curved, flat rib bones.
It protects the delicate vital organs such as the heart and lungs.
Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems

Q.2List out the functions of the human skeleton.v
Solution

The skeletal system gives shape to the body.
Bones provide a framework for the body.
Bones along with muscles help in movements such as walking, running, chewing and dancing, etc.
It protects the soft internal organs.

Answer:

The skeletal system gives shape to the body.
Bones provide a framework for the body.
Bones along with muscles help in movements such as walking, running, chewing and dancing, etc.
It protects the soft internal organs.

Q.3Differentiate between the voluntary muscles and involuntary muscles.v
Solution

Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems 2

Answer:

Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems 2

8IX. Answer in detail:2 questions
Q.1List out the functions of the Endocrine system and Nervous system.v
Solution

Endocrine system regulates various functions of the body and maintains the internal environment.
Endocrine glands produce chemical substances called “Hormones’ which control various activities of the body.
Eg. Growth hormone controls growth, the Adrenalin hormone acts at the time of fear stress, etc.
Functions of the nervous system:
Sensory input: The conduction of signals from sensory receptors.
Integration: The interpretation of the sensory signals and the formulation of responses.
Motor output: The conduction of signals from the brain and spinal card to effectors such as muscle and gland cells.

Answer:

Endocrine system regulates various functions of the body and maintains the internal environment.
Endocrine glands produce chemical substances called “Hormones’ which control various activities of the body.
Eg. Growth hormone controls growth, the Adrenalin hormone acts at the time of fear stress, etc.
Functions of the nervous system:
Sensory input: The conduction of signals from sensory receptors.
Integration: The interpretation of the sensory signals and the formulation of responses.
Motor output: The conduction of signals from the brain and spinal card to effectors such as muscle and gland cells.

Q.2Label the diagram given below to show the four main parts of the urinary system and answer the following questions. Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems 3v
  1. A. Which organ removes extra salts and water from the blood?
  2. B. Where is the urine stored?
  3. C. What is the tube through which urine is excreted out of the body?
  4. D. What are the tubes that transfer urine from the kidneys to the urinary bladder called?
Solution

a. The functional units of the kidney are called Nephrons which filter the blood and form the urine.
b. Urine is stored in the urinary bladder.
c. Urine is expelled out through the urethra.
d. The ureters that transfer urine from the kidneys to the urinary bladder.
Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems

Answer:

a. The functional units of the kidney are called Nephrons which filter the blood and form the urine.
b. Urine is stored in the urinary bladder.
c. Urine is expelled out through the urethra.
d. The ureters that transfer urine from the kidneys to the urinary bladder.
Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems

9X. Questions based on Higher Order Thinking Skills4 questions
Q.1What will happen if the diaphragm shows no movement?v
Solution

The diaphragm is the primary organ of breathing.
The movement of the diaphragm expands the lungs and creates a vacuum.
Due to this, the air is sucked in.
If the diaphragm does not move the lungs do not expand or contract and breathing stops.
The person will die.

Answer:

The diaphragm is the primary organ of breathing.
The movement of the diaphragm expands the lungs and creates a vacuum.
Due to this, the air is sucked in.
If the diaphragm does not move the lungs do not expand or contract and breathing stops.
The person will die.

Q.2Why is the heart divided into two halves by a thick muscular wall?v
Solution

The ventricles of the heart have thicker muscular walls than the atria.
The left ventricle also has a thicker muscular wall than the right ventricle.
This is due to the higher forces needed to pump blood through the systemic circuit compared to the pulmonary circuit.

Answer:

The ventricles of the heart have thicker muscular walls than the atria.
The left ventricle also has a thicker muscular wall than the right ventricle.
This is due to the higher forces needed to pump blood through the systemic circuit compared to the pulmonary circuit.

Q.3Why do we sweat more in summer?v
Solution

Sweating plays an important health role as it helps to maintain constant body temperature by cooling us down.
When it is hot and we sweat that moisture evaporates and cools us immediately.
This is why we sweat more when the summer is very hot.

Answer:

Sweating plays an important health role as it helps to maintain constant body temperature by cooling us down.
When it is hot and we sweat that moisture evaporates and cools us immediately.
This is why we sweat more when the summer is very hot.

Q.4Why do we hiccup and cough sometimes when we swallow food?v
Solution

Reasons for hiccup and cough :
Eating too – quickly and swallowing air along with foods.
Eating too – many fatty or spicy foods in particular.
Drinking too much-carbonated beverages or alcohol can distend the stomach and irritate the diaphragm which can cause hiccups.

Answer:

Reasons for hiccup and cough :
Eating too – quickly and swallowing air along with foods.
Eating too – many fatty or spicy foods in particular.
Drinking too much-carbonated beverages or alcohol can distend the stomach and irritate the diaphragm which can cause hiccups.

10I. Choose the right answer:5 questions
Q.1A newborn baby has ……….. bones.v
  1. A. 206
  2. B. More than 200
  3. C. More than 300
  4. D. 210
Solution

(c) More than 300

Answer:

(c) More than 300

Q.2_______ connect bone to muscle.v
  1. A. Skeleton
  2. B. Tendons
  3. C. Cartilages
  4. D. Ligaments
Solution

(b) Tendons
Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems

Answer:

(b) Tendons
Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems

Q.3The walls of the heart is made up ofv
  1. A. Voluntary muscles
  2. B. Cardiae muscles
  3. C. Involuntary muscles
  4. D. Biceps muscle
Solution

(b) Cardiac muscles

Answer:

(b) Cardiac muscles

Q.4_______ muscles are found in the walls of the digestive tract, urinary bladder arteries, and other internal organs.v
  1. A. Bone
  2. B. Smooth
  3. C. Cardiac
  4. D. triceps
Solution

(b) Smooth

Answer:

(b) Smooth

Q.5The bronchi divide further and end in small air sacs calledv
  1. A. Cerebrum
  2. B. Thymus
  3. C. Alveoli
  4. D. Pinna
Solution

(c) Alveoli

Answer:

(c) Alveoli

11IV. Arrange in the correct sequence2 questions
Q.1Trachea → Bronchi → Pharynx → Lungs → Larynx → Nasal cavity → Nostrils → Bronchiole → Alveolusv
Solution

Nostrils → Nasal cavity → Pharynx → Larynx → Trachea → Bronchi → Bronchiole → Alveolus

Answer:

Nostrils → Nasal cavity → Pharynx → Larynx → Trachea → Bronchi → Bronchiole → Alveolus

Q.2Middle ear → Pinna → Outer ear → Inner earv
Solution

Pinna → Outer ear → Middle ear → Inner ear.

Answer:

Pinna → Outer ear → Middle ear → Inner ear.

12V. Analogy1 questions
Q.G5Skull: Made up of cranial bones and facial bones :: ………… : Made up of 12 pairs of curved flat rib bones Biceps : Bends the arm at the elbow :: ……….. : Straightens the elbowv
Solution

Ribcage
Triceps

Answer:

Ribcage
Triceps

13VI. Very Short Answer:2 questions
Q.1What are the two major divisions of the skeletal system?v
Solution

The two major divisions of the skeletal system are.
Axial skeleton
Appendicular skeleton.

Answer:

The two major divisions of the skeletal system are.
Axial skeleton
Appendicular skeleton.

Q.5What is the length of the Alimentary canal?v
Solution

9 metres.
Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems

Answer:

9 metres.
Samacheer Kalvi 6th Science Guide Term 2 Chapter 6 Human Organ Systems