I. Choose the appropriate answer
1. Circulatory system transports these throughout the body
d. All of these
Answer: (d) All of these
2. Main organ of respiration in human body is
Answer: (d) Lungs
3. Breakdown of food into smaller molecules in our body is known as
a. Muscle contraction
Answer: (c) Digestion
II. Fill in the blanks
1. A group of organs together make up an organ system
2. The part of the skeleton that protects the brain is the skull
3. The process by which the body removes waste is excretion
4. The skin is the largest sense organ in our body
5. The endocrine glands produce chemical substances called Hormones
III. True or False. If False, give the correct statement
1. Blood is produced in the bone marrow. [True]
2. All the waste products of the body are excreted through the circulatory system. [False]
All the waste products of the body are excreted
through the excretory system.
3. The other name of food pipe is alimentary canal. [True]
4. Thin tube like structures which are the component of circulatory system are called blood vessels. [False]
Thin tube like structures which are the component of
circulatory system are called capillaries.
5. The brain, the spinal cord and nerves form the nervous system. [False]
The brain, the spinal cord, the nerves and the sensory
organs form the nervous system.
IV. Mach the following
1. Ear - Cardiac muscle
2. Skeletal System - Flat muscle
3. Diaphragm - Sound
4. Heart - Air sacs
5. Lungs - Protection of internal Organs
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 Correct sequence
1. Stomach → Large intestine → Oesophagus → Pharynx → Mouth → Small Intestine → Rectum → Anus
Mouth → Pharynx → Oesophagus → Stomach → Small Intestine → Large intestine
2. Urethra → Ureter → Urinary Bladder → Kidney
Kidney → Ureter → Urinary → Bladder Urethra
1. Arteries : Carry blood from the heart:: Veins :carry blood to the heart.
2. Lungs: Respiratory system:: Heart : Circulatory system.
3. Enzymes: Digestive glands:: Hormones : Endocrine glands
VII. Give very short answer
1. Describe about skeletal system.
The skeletal system consists of bones, cartilages and joints. Bones provide a framework for the body. Along with the muscles bones help in movements.
2. Write the functions of epiglottis.
Epiglottis is a flap like structure on top of the windpipe. While eating, epiglottis closes the wind pipe and thus it prevents the entry of food into the windpipe.
3. What are the three types of blood vessels?
(i) arteries (ii) veins (iii) capillaries
4. Define the term "Trachea".
The trachea is also called windpipe. It is a tube supported by cartilaginous rings that connect the pharynx and larynx to the lungs allowing the passage of air.
5. Write any two functions of digestive system.
(i) It is involved in the conversion of complex food substances into simple forms.
(ii) It is also involved in the absorption of digested food.
6. Name the important parts of the eye.
(i) Cornea (ii) Iris (iii) Pupil
7. Name the five important sense organs.
(i) Eyes (ii) Ears (iii) Nose (iv) Tongue (v) Skin
VIII. Give short answer
1. Write a short note on rib cage.
The rib cage is made up of 12 pairs of curved, flat rib bones. It protects the delicate vital organs such as heart and lungs.
2. List out the functions of the human skeleton.
The skeletal system consists of bones, cartilages and joints. Bones provide a frame work for the body. They give shape and support to the body. Bones along with muscles help in movements such as walking, running, chewing and dancing etc.,
3. Differentiate between the voluntary muscles and involuntary muscles.
Voluntary muscles can be controlled by our will. Example : Muscles of arm.
Involuntary muscles cannot be controlled by our will. Example: Cardiac muscles.
IX. Answer in detail
1. List out the functions of Endocrine system and Nervous system.
Endocrine system regulates various functions of the body and maintains the internal environment. The two important functions of the nervous system along with the endocrine system are conduction and co-ordination.
2. Label the diagram given below to show the four main parts of the urinary system and answer the following questions.
A. Which organ removes extra salts and water from the blood?
B. Where is the urine stored?
C. What is the tube through which urine is excreted out of the body?
D. What are the tubes that transfer urine from the kidneys to the urinary bladder called?
X. Questions based on Higher Order Thinking Skills
1. What will happen if the diaphragm shows no movement?
We inhale and exhale gases due to the movement of the diaphragm. If the diaphragm shows no movement our lungs cannot inhale air from outside; they cannot exhale impure air from the lungs.
2. Why is the heart divided into two halves by a thick muscular wall?
The pure blood in one side of the heart should not get mixed with the impure blood on the other side. So the heart is divided into two halves by a thick muscular wall.
3. Why do we sweat more in summer?
In hot summer, the sweat glands expand more and give out more sweat. As we sweat more our skin remains cool and it does not get heated up.
4. Why do we hiccup and cough sometimes when we swallow food?
The epiglottis closes the windpipe when we swallow our food. When we eat in haste the epiglottis remains open and food particles go into the windpipe accidentally. To throw out the food the lungs push out air forcefully. As a result we hiccup and cough.