This document provides educational content about blood for 7th-grade students, detailing its components including plasma, red blood cells (RBCs), white blood cells (WBCs), and platelets. Key facts include the volume of blood in an average adult (5-6 liters) and the lifespan of RBCs (about 120 days). The material also includes interactive questions to test comprehension of the information presented.

1. Topic: Blood
Class: 7th
Age:11
Medium: English
Let’s start module
Programmed Instructional material

2. Objectives :-
At the end of this module you will be able to:-
 To know about blood
 To know about components of
blood
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3. BLOOD
Blood is a red colored fluid which flows in
blood levels to every part of the blood.
An average adult person contains 5-6 liters of
blood.
The blood consists of two components.
1. Fluid components- blood plasma
2. Solid components-blood cells which include
red blood cells(RBCs),white blood
cells(WBC) and platelets.
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4. So, blood is a red coloured fluid consisting of
plasma liquid with red blood cells
(RBCs),white blood cells (WBC) and platelets
floating in it.
Plasma- plasma is the fluid part of the blood
.Plasma carries water and various material like
digestive food, waste material etc.
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5. Red blood cells-RBC are red in colour due to the
presence of a red pigment called
Haemoglobin.RBCs are produced in the red bone
marrow of bones.
The average life span of RBCs is about 120 days.
They are disc in shaped and smaller in size.
WBC-are coloureless,irregular shaped cells.They
are fewer in number but bigger in size than RBC.
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6. WBC-are colourless,irregular shaped cells.
They are fewer in number but bigger in size
than RBCs.
PLATELETS- Platelets are coloureless ,round,
tiny cells formed in the bone marrow
Let’s answer some questions

7. Q1: What is the color of blood?
-Blue
-Red
-Orange
-Green

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11. Q2: An average adult person how
many liters of blood?
12L
5-6L
7-8L
3L

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15. Q3:The blood consists of……..
components
3
2
5
1

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19. Q4:RBCs are red due to presence of
which pigment ?
red
-yellow
-Haemoglobin
-green

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23. Q5:What is the average life span of
RBCs?
90days
120days
150days
110days

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27. Congratulations you have Scored 50
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