CBSE Class 5 Science Our Body Assignment

Worksheet 4
Ch:4 (Our Body)

Q1. Name the joint present in following:--
(a) Shoulder and hip: Ball and socket joint
(b) Bones of wrist: Gliding joint
(c) Bones of elbow: Hinge joint
(d) Bones of toes and fingers: Hinge joint
(e) Neck and head: Pivot joint
Answer: (a) Ball and socket joint, (b) Gliding joint, (c) Hinge joint, (d) Hinge joint, (e) Pivot joint.
In simple words: Different types of joints allow different kinds of movements in our body parts.

Exam Tip: Learn the exact locations and types of movable joints in the human body as this is a frequently asked question.

Q2. Complete the web chart.
Answer:
Top box: BLOOD VESSEL
Left branch boxes: ARTERIES and CAPILLARIES
Middle branch box: VEINS
Right branch boxes: CAPILLARIES / ARTERIES (depending on layout, carrying blood to every cell)
In simple words: Blood vessels are a network of tubes that transport blood throughout the body, consisting of arteries, veins, and capillaries.

Exam Tip: Remember the three main types of blood vessels and their basic functions.

Q3. What are the functions of liquid portion of blood?
Answer: The liquid portion of blood is called plasma. Its main functions are to transport digested food, hormones, waste products, and nutrients to and from various parts of the body, and to help maintain body temperature.
In simple words: Plasma carries water, nutrients, and waste products to different parts of our body.

Exam Tip: State that plasma is the liquid part of blood and mention transport of nutrients and wastes for full marks.

Q4. Name the following:-
a) Upper chambers of heart: Atria (or Auricles)
b) Lower chambers of heart: Ventricles
c) Blood cells that help in clotting of blood: Platelets
d) Blood vessels that carry oxygen-rich blood: Arteries
e) Blood vessels that carry oxygen-deficit blood: Veins
f) Thickened mass of blood formed by platelets: Clot (or Scab)
g) Instrument used to listen heart-beat: Stethoscope
h) Protective cage around the heart and lungs: Rib cage
i) Bony framework of head which protects brain: Skull
j) A place where two or more bones meet: Joint
k) Strong tissue which joins the bones: Ligament
l) Group of cells which perform common function: Tissue
Answer: (a) Atria, (b) Ventricles, (c) Platelets, (d) Arteries, (e) Veins, (f) Clot, (g) Stethoscope, (h) Rib cage, (i) Skull, (j) Joint, (k) Ligament, (l) Tissue.
In simple words: These are the standard biological terms for the key parts of the human circulatory, skeletal, and cellular systems.

Exam Tip: Make sure not to confuse ligaments (bone to bone) with tendons (muscle to bone).

Q5. Draw the structure of the heart.
Answer:
1. Draw an outline of the human heart showing the right and left sides.
2. Label the upper chambers as Right Atrium and Left Atrium.
3. Label the lower chambers as Right Ventricle and Left Ventricle.
4. Draw and label the major blood vessels entering and leaving the heart: Vena Cava, Aorta, Pulmonary Artery, and Pulmonary Vein.
In simple words: A well-labeled diagram of the heart shows its four chambers and major blood vessels clearly.

Exam Tip: Always use a sharp pencil, draw clean lines, and label both the chambers and blood vessels correctly to score full marks in diagram questions.