Samacheer Kalvi 6th Science Term 2 Unit 6 Book Back Questions and Answers:

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TN State Board Class 6th Science Subject Term 2 Unit 6 one mark and two mark solutions guide PDF available below.

6th Science – Term 2

Unit 6 – Human Organ Systems

I. Choose the appropriate answer:

1. Circulatory system transports these throughout the body
(a) Oxygen
(b) Nutrient
(c) Hormones
(d) All of these
Answer: (d) All of these

2. the Main organ of respiration in the human body is
(a) Stomach
(b) Spleen
(c) Heart
(d) Lungs
Answer: (d) Lungs

3. Breakdown of food into smaller molecules in our body is known as
(a) Muscle contraction
(b) Respiration
(c) Digestion
(d) Excretion
Answer: (c) Digestion

II. Fill in the blanks:

1. A group of organs together make up an _______ system.
2. The part of the skeleton that protects the brain is _______
3. The process by which the body removes waste is _______
4. The _______ is the largest sense organ in our body.
5. The endocrine glands produce chemical substances called _______

Answers:

1. organ
2. skull
3. Excretion
4. skin
5. hormones

III. True or False. If False, give the correct statement:

1. Blood is produced in the bone marrow.
Answer:
False, Red Blood Corpuscles are produced in the bone marrow.

2. All the waste products of the body are excreted through the circulatory system.
Answer:
False, All the waste products of the body are excreted through the excretory system.

3. The other name of the food pipe is an alimentary canal.
Answer:
False. The other name of the food pipe is called oesophagus.

4. Thin tube-like structures which are the component of the circulatory system are called blood vessels.
Answer:
False, The tube like structure which are the component of circulatory system are called blood capillaries.

5. The brain, the spinal cord and nerves form the nervous system.
Answer: True

IV. Match the following:

1. Ear	Cardiac muscle
2. Skeletal System	Flat muscle
3. Diaphragm	Sound
4. Heart	Air sacs
5. Lungs	Protection of internal organs

Answer:

1. Ear	Sound
2. Skeletal System	Protection of internal organs
3. Diaphragm	Flat muscle
4. Heart	Cardiac muscle
5. Lungs	Air sacs

V. Arrange in the Correct sequence:

1. Stomach → Large intestine → Oesophagus → Pharynx → Mouth → Small Intestine → Rectum → Anus.
Answer:
Mouth → Pharynx → Oesophagus → Stomach → Small Intestine → Large intestine → Rectum → Anus.

2. Urethra → Ureter → Urinary Bladder → Kidney.
Answer:
Kidney → Ureter → Urinary Bladder → Urethra.

VI. Analogy:

1. Arteries : Carry blood from the heart:: _______ :carry blood to the heart.
Answer: Veins.

2. Lungs: Respiratory system:: _______ : Circulatory system.
Answer: Heart

3. Enzymes: Digestive glands:: _______ : Endocrine glands.
Answer: Hormones

VII. Give a very short answer:

1. Write about the skeletal system.
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.

2. Write the functions of the epiglottis.
Answer:
The function of Epiglottis is to prevent the entry of food into the windpipe.

3. What are the three types of blood vessels?
Answer:
The three types of blood vessels are arteries, veins and capillaries.

4. Define the term “Trachea”.
Answer:
The trachea is commonly called a windpipe. It is a tube supported by cartilaginous rings that connect the pharynx and larynx to the lungs, allowing the passage of air. The trachea divides into right and left bronchi and enter into the lungs.

5. Write any two functions of the digestive system?
Answer:
The functions of the digestive system are:

1. It is involved in the conversion of complex food substances into simple forms.
2. It absorbs digested food.

6. Name the important parts of the eye.
Answer:
The important parts of the eye are the cornea, iris, lens, and pupil.

7. Name the five important sense organs?
Answer:
The five important sense organs are the eyes, ears, nose, tongue, and skin.

VIII. Give a short answer:

1. Write a short note on the rib cage.
Answer:
Rib cage
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.

2. List out the functions of the human skeleton.
Answer:

1. Bones along with muscles help in movements such as walking, running, dancing, etc.
2. Skullbone protects the brain and the structures of the face.
3. The vertebral column protects the spinal cord.
4. The rib cage protects vital organs such as the heart and lungs.

3. Differentiate between the voluntary muscles and involuntary muscles.
Answer:
Voluntary muscles:

1. They are attached to the bones.
2. They can be controlled by our will. Example: Muscles of the arm.

Involuntary muscles:

1. They are found in the walls of the digestive tract, urinary bladder, arteries, and other internal organs.
2. They cannot be controlled by our will.

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