A. Fill in the blanks.
1. Wind pipe connects nose to the lungs in mammals.
2. Of the two jaws, only the lower jaw moves.
3. The backbone protects the spinal cord.
4. Fish can feel waves with the help of their lateral line.
5. A snake uses its tongue to touch and smell objects.
6. Eye is connected to the brain by the optic nerve.
B. Match the following:
1. elbow c. hinge joint
2. wrist e. gliding joint
3. hip d. ball and socket joint
4. femur a. longest bone
5. skull b. right flat bones
C. Tick (✔) the correct option.
1. The joint in the shoulder is an example of a-
(a) hinge joint
(b) ball and socket joint (✔)
(c) pivot joint
(d) gliding joint
Answer – (b) ball and socket joint (✔)
2. The framework of bones, that protects our heart and lungs, is known as the
(a) spinal cord
(b) skull
(c) rib cage (✔)
(d) pivot joint
Answer – (c) rib cage (✔)
3. Light enters the eyes through the
(a) pupil (✔)
(b) cornea
(c) retina
(d) iris
Answer – (a) pupil (✔)
4. The part of the ear which helps in maintaining balance of our body is-
(a) external ear
(b) ear drum
(c) middle ear
(d) inner ear (✔)
Answer – (d) inner ear (✔)
D. Answer the following questions in brief.
1. What is breathing?
Answer – The process of taking in oxygen and giving out carbon dioxide in all living things is called breathing.
2. How are fore limbs connected to the spine?
Answer – The fore limbs are connected to the spine by the shoulder girdles and collar bone.
3. State the importance of the rib-cage in our body.
Answer – Ribcage protects the delicate organs like the heart and the lungs.
4. Name the main parts of the skeletal system.
Answer – The main parts of the skeletal system are:
(i) Skull
(ii)Backbone
(iii)Rib-cage
(iv) Limbs
5. State the role of inner ear in the process of hearing.
Answer – Middle ear convey the vibrations from the ear drum to the inner ear. Inner ear changes the vibrations to electrical signals and sends to the brain.
6. How does a snake detect the presence of an enemy or a prey?
Answer – The snake feels different kinds of vibrations on the earth through its skin. This helps it to detect the presence of an enemy or a prey.
E. Answer the following questions.
1. Why do bones have joints?
Answer – Bones have joints for movement of different body parts and help in locomotion also.
2. Why is our backbone made up of many small vertebrae instead of having one straight long bone?
Answer – Our backbone is made up of many small vertebrae to give flexibility to the backbone for easy bending.
3. Why is bone marrow known as the factory for making blood cells?
Answer – Blood cells are manufactured inside this bone marrow. Therefore, bone marrow is known as the factory for making blood cells.
4. How does a ball and socket joint work?
Answer – In this joint, one bone which has a ball-like end, fits into the hollow socket of another bone. This allows the former bone to move in all directions.
5. Dogs and bats are also mammals like us. How does our sense of smell compare with that of a dog and our sense of hearing with that of a bat?
Answer – Dogs have a highly developed sense of smell. It’s better than us which helps police to catch thieves. Bats have a special power to hear high-pitched sounds (ultrasonic) which we don’t have. Due to this ability, bats can detect their prey easily even in the dark.
6. Do you breathe even when you are sleeping? Give reason for your answer.
Answer – Yes, we breathe even when we are sleeping for continuous and proper functioning of life processes going in our body for which continuous supply of energy is required, for which we need oxygen. If we will not breathe for more than two minutes, we may die.
VALUE Based Question
The students of Class-V were asked to prepare posters for the coming parent- teacher meet. The teacher assigned different roles to different students. All of them did their work happily in a sincere and organised way. They all helped one another.
Their work was liked and praised by all the visitors. The teacher compared their work with the ‘Breathing System’ when she taught that topic in the class.
1. State the values displayed by the students.
Answer – Values displayed by the students are –
Obedient – students were obedient as the listened to their teacher and completed their homework.
Sincerity – students showed the value of sincerity by completing their work completely in given time.
Organised – students showed the value of teamwork by completing their work in an organised manner. It also divides the work into smaller among teammates.
2. Discuss how doing work in an organised and helpful way is useful for one and all.
Answer – If work is done in an organised way, it will be more efficient and proper. It will save time also.
3. Why did the teacher compare their work with the ‘Breathing System”?
Answer – The teacher compared students work with the ‘Breathing System” because the students did work in an organised way just like the different organs perform different functions and carry out breathing system properly.
Something to Do
1. Try to make riddles about the functions of sense organs. One example is given below:
I am an organ that helps you to see,
Coloured disc in white, can you recognise me!
Answer: Eye
2. Find out how your external ear compares with that of the external ear of other mammals like cow, horse and elephant. What differences are there? Also find out about any other functions performed by the external ear of these animals.
Answer – Students will do this task under the supervision of teacher.
3. There are many things in the house that have joints, e.g., door and scissors. Compare the joints of your body with different joints that you see in various appliances in your house. Record your results in the following table:
Name of the joint in our body Joint in an appliance which is similar
Hinge joint Hinge of the door
Ball and Socket joint Bearing of bike
Pivot joint Cycle axle
Gliding joint The swans glided over the surface of the lake.
By – Sunaina Karmakar