MEDIUM
12th CBSE
IMPORTANT
Earn 100

During a school trip to 'Rohtang Pass', one of your classmates suddenly developed 'altitude sickness'. But, she recovered after sometime.

How could she recover by herself after sometime?

Important Questions on Model Question Papers 4

MEDIUM
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 21 - Model Question Papers 4>MODEL QUESTION PAPER>Q 21
Name and describe the technique that helps in separation and isolation of DNA fragments for biotechnology experiment.
MEDIUM
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 21 - Model Question Papers 4>MODEL QUESTION PAPER>Q 21
Explain enzyme-replacement therapy to treat adenosine deaminase deficiency. Mention two disadvantages of this procedure.
MEDIUM
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 21 - Model Question Papers 4>MODEL QUESTION PAPER>Q 22
Draw a labelled diagram of sparged-stirred tank bioreactor. Write its application.
MEDIUM
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 21 - Model Question Papers 4>MODEL QUESTION PAPER>Q 23
One of the best known applications of biotechnology is the production of pest resistant plants. How is this achieved in Bt Cotton?
MEDIUM
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 21 - Model Question Papers 4>MODEL QUESTION PAPER>Q 24
Describe the inter-relationship between productivity, gross primary productivity and net productivity.
MEDIUM
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 21 - Model Question Papers 4>MODEL QUESTION PAPER>Q 24
Which one of the two "in-situ" or "ex-situ" biodiversity conservation measures help the larger number of species to survive? Explain.
HARD
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 21 - Model Question Papers 4>MODEL QUESTION PAPER>Q 25
Schematically represent and explain the events of spermatogenesis in humans.
MEDIUM
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 21 - Model Question Papers 4>MODEL QUESTION PAPER>Q 25
 Explain the events taking place at the time of fertilisation of an ovum in a human female.