Question
The diagrams show four different types of cells. Which cell contains haemoglobin?
▶️Answer/Explanation
Ans C
The correct answer is C, because :
Red blood cells contain red pigment called haemoglobin, which helps in oxygen carrying.
• A – It’s a root hair cell and it doesn’t contain haemoglobin.
• B – It’s a typical animal cell, but doesn’t contain haemoglobin.
• D – It’s sperm cell, and it’s help in fertilisation which doesn’t contain haemoglobin.
Question
When a pathogen enters the blood, the number of white blood cells increases.
Some possible reasons why this happens are listed.
- It increases the number of antibodies.
- It increases the transport of oxygen.
- It increases phagocytosis.
- It increases the number of platelets.
Which reasons are correct?
A) 1 and 3
B) 1 and 4
C) 2 and 3
D) 2 and 4
▶️Answer/Explanation
Ans: A
The correct answer is A, because :
Entry of pathogen (antigen), activates immune response and it needs to be neutralised by body mechanisms, to not become infected.
So, to happen in that way, antibodies are produced against antigen.
• Increase in oxygen transport is held by RBCs but they doesn’t increase on pathogen entry.
• Increase in phagocytosis, means engulfing of pathogens.
• Increase in number of platelets, is seen during blood loss to coagulate and make stop blood loss.
Question
What is a direct way of transmitting a pathogen?
A by contact with contaminated air
B by contact with contaminated blood
C by contact with contaminated food
D by contact with contaminated surfaces
▶️Answer/Explanation
Ans B
The correct answer is B, because :
Direct way of transmitting pathogen, is the infected person directly transfers pathogen to healthy person.
• It is seen in blood contact.
Whereas,
• Contaminated air, Blood , Surfaces are indirect way of transmitting pathogen.
Question
Transmissible diseases are transmitted when a pathogen is passed from one host to another. What is an example of direct contact?
A breathing in pathogens
B contact with blood or other body fluids
C contact with contaminated surfaces
D eating or handling contaminated food
▶️Answer/Explanation
Ans B
The correct answer is B, because :
Direct way of transmitting pathogen, is the infected person directly transfers pathogen to healthy person.
• It is seen in blood contact.
Whereas,
• Contaminated air, Blood , Surfaces are indirect way of transmitting pathogen.