Immune System

Q.

What is antivirus? Give one example?

Q.

Name two barriers, which prevent the entry of microbes into the body.

Q.

The primary and secondary immune responses are carried out with the help of two special types of

1. Natural killer cells and Macrophages

2. Lymphocytes

3. Antiviral proteins

4. Macrophages and interferons

Q. What is inflammation?

Q.

A Letter To Your Uncle Asking Him About His Health

Q.

Question 11
Excessive exposure of human beings to UV-rays results in
(i) Damage to immune system
(ii) Damage to lungs
(iii) Skin cancer
(iv) Peptic ulcers

(a) (i) and (ii)
(b) (ii) and (iv)
(c) (i) and (iii)
(d) (iii) and (iv)

Q.

Define immunity.

Q.

The absence of HCl in gastric juice would ___________ .

1. accelerate the action of enzymes in the stomach.

2. kill all microorganisms entering through food.

3. hamper the action of pepsin and promote the growth of microorganisms.

4. enhance excessive digestion and promote the growth of microorganisms.

Q.

Which antibody can cross the placenta?

1. IgE

2. IgA

3. IgG

4. IgM

Q. Write the full forms of:
(vi) ATS

Q. Why a person suffering from AIDS cannot fight against small infections?

Q.

Assertion (A): Innate immunity is a non-specific type of defense present at the time of birth.

Reason (R): Saliva, tears and sweat act as physiological barriers for innate immunity

1. Both A and R are true and R is the correct explanation for A.

2. Both A and R are true, but R is not the correct explanation for A.

3. A is true and R is false.

4. A is false and R is true.

Q. Why is AIDS called acquired immunodeficiency?

Q.

Question 35
Why do some children fall ill more frequently than others living in the same locality?

Q. Resistance to a disease which an individual acquires during his life time is called as immunity.

1. innate
2. acquired
3. specific

Q.

Explain how does the body react after the entry of a microbe into the body.

Q. Identify the immunoglobulins (i), (ii), (iii) and (iv) and select the correct option.

(i) It is only antibody that can cross placenta and confer immunity to foetus.

(ii) It is mediator in allergic reactions and activates histamine secreting cells.

(iii) It is the one that first activates in an initial attack of antigen.

(iv) It has role in activating and suppressing lymphocyte activity.

1. 
   $\begin{array}{c}\text{a)}\text{IgD}\\ \text{b)}\text{IgM}\\ \text{c)}\text{IgE}\\ \text{d)}\text{IgG}\end{array}$
2. 
   $\begin{array}{c}\text{a)}\text{IgG}\\ \text{b)}\text{IgE}\\ \text{c)}\text{IgM}\\ \text{d)}\text{IgD}\end{array}$
3. 
   $\begin{array}{c}\text{a)}\text{IgE}\\ \text{b)}\text{IgG}\\ \text{c)}\text{IgM}\\ \text{d)}\text{IgD}\end{array}$
4. 
   $\begin{array}{c}\text{a)}\text{IgG}\\ \text{b)}\text{IgM}\\ \text{c)}\text{IgE}\\ \text{d)}\text{IgD}\end{array}$

Q.

In acquired immunity, pathogen-specific receptors are "acquired" during the lifetime of the organism.

1. True

2. False

Q. Why do we actually fall ill?

Q. When people fall ill, their immune system fights the disease and tries to restore the person to good health.Which disease is known to attack the human immune system leaving the body susceptible to various kinds of infection?
a)chicken pox
b)pneumonia
c)tuberculosis
d)AIDS

Q.

Find out the wrong match.

1. eosinophils -allergic response

2. basophils - secrete histamine and serotonin

3. neutrophils- phagocytic and destroy the foreign organism

4. Monocytes- secrete heparin

Q.

Describe types of immunity. [3 MARKS]

Q.

Differentiate the following:

Innate immunity and acquired immunity

Q. Match the following types of immunity with their characteristics.

1. From birth
2. Short lived
3. Vaccines

Q.

Antibodies and Antitoxins are special ___ present in body fluids.

Q.

___ injections are prepared from the serum of animal's blood and are injected into the body of the patient.

Q.

What are the different types of immunity and their sources?

Q. Why isAIDSa syndrome not a disease?

Q.

What are various elements in an immune system?

Q.

Question 37
Becoming exposed to or infected with an infectious microbe does not necessarily mean developing a noticeable disease. Explain.