Question of Exercise-5

Human Health and Diseases of Class 12

AIDS was first discovered in


Option 1 1981 in America

Option 2 1981 in Asia

Option 3 1984 in America

Option 4 1984 in France

Frequently Asked Questions

Seminal plasma of humans is rich in

 A: Fructose and certain enzymes, poor in Ca2+ 

B: Fructose, Ca2+  and certain enzymes

C: Fructose, Ca2+  but no enzymes

D: Glucose, certain enzymes but no Ca2+



Pairs of seminal vesicles, a prostate, and paired bulbourethral glands are among the male accessory glands.

The seminal plasma is made up of the secretions of these glands and is high in fructose calcium and specific enzymes.

Prostate gland secretions are alkaline in nature, which aids in the neutralisation of vaginal acidity.

Bulbourethral gland secretions aid in the lubrication of the penis.

So, the correct option is 'Fructose, Ca2+ and certain enzymes'.

Final Answer :

The correct option is Option B: Fructose, Ca2+ and certain enzymes.

Who is called the father of immunology

A: Louis Pasteur

B: Robert Koch

C: Edward Jenner

D: Iwanowsky


Explanation : 

  • The father of immunology is Edward Jenner, an English physician and scientist.
  • Jenner was a smallpox vaccine pioneer, and his experiments paved the road for the immune system's discovery.
  • By injecting pus from an infected person into a healthy host, he was able to evaluate immunological capabilities.
  • Instead of infecting the healthy person, the antigen in the pus triggered an immunological response.

Correct Option is: (C) Edward Jenner


Who is known as the father of plant tissue culture

A: Haberlandt

B: Steward

C: White

D: Skoog


Correct option is: (A) Haberlandt


Option (A) 

Professor Gottlieb Haberlandt demonstrated the feasibility of cultivating isolated plant tissues for the first time in 1902.

He was the first to consider cultivating cells in a nutrient solution aseptically.

He is regarded as the "Father of Plant Tissue Culture."

Option (B):

Steward's experiment on plant tissue demonstrates that mature cells in plants may divide and differentiate again to make a new plant.

Option (C):

White's media is a common medium in which plants are cultivated particularly for root culture.

It has a low salt content and a greater magnesium sulphate concentration.

This may also be used to cultivate shoot culture and callus culture.

Option (D):

Murashige and Skoog medium is a laboratory plant growth media used for plant cell culture cultivation.

Seminal plasma in humans is rich in

A: Fructose and certain enzymes but poor calcium

B: Fructose and calcium but has no enzyme

C: Fructose, calcium and certain enzymes

D: Glucose and certain enzymes but has no calcium


Correct Option is: (C) Fructose, calcium and certain enzymes

Explanation :- 

Seminal plasma is the liquid part of the semen.

The components of seminal plasma are :- fructose, calcium, lipids, citric acid, and certains enzymes. 

Seminal plasma is rich in calcium.

It does not contain glucose. It only contains fructose.

These components of seminal plasma are secreted by seminal vesicles, prostate glands, and bulbourethral glands. 

Which of the following does not yield wool

A: Yak

B: Camel

C: Goat

D: Woolly dog


Correct Option is: (D) Woolly dog

Explanation :-

Wool is a fiber obtained from the hair or fur of animals like sheep, goats, angora rabbits, and camels.

The hair of woolly dogs does not provide wool, because their hairs can not be spun like the hairs of sheep or goats.

Wool acts as an insulator and keeps us warm during the winter season.

Wools are highly breathable, flexible, and elastic.

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