MEDIUM
12th CBSE
IMPORTANT
Earn 100

Draw a labelled sketch of a typical biogas plant.

Important Questions on Model Question Papers 3

EASY
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 20 - Model Question Papers 3>MODEL QUESTION PAPER>Q 20
Explain the term with reference to drug/alcohol abuse:
Addiction
HARD
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 20 - Model Question Papers 3>MODEL QUESTION PAPER>Q 21
Why is haemophilia rare in human females? Mention a clinical symptom for the disease.
MEDIUM
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 20 - Model Question Papers 3>MODEL QUESTION PAPER>Q 22
Rice, wheat and maize are the most commonly used food grains the world over. How have these grains improved in their nutritional value in comparison to their conventional varieties?
 
HARD
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 20 - Model Question Papers 3>MODEL QUESTION PAPER>Q 24

Question Image

How is the coding sequence of beta-galactosidase considered a better selectable marker than the marker in the diagram? Explain.

MEDIUM
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 20 - Model Question Papers 3>MODEL QUESTION PAPER>Q 22
What is the breeding of crops for enhancing their nutritional value called? Why is the need felt for enhancing the nutritional value of the crops?
MEDIUM
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 20 - Model Question Papers 3>MODEL QUESTION PAPER>Q 23
Why do lepidopterans die when they feed on Bt cotton plant? Explain how does it happen.
MEDIUM
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 20 - Model Question Papers 3>MODEL QUESTION PAPER>Q 26
How did Darwin explain adaptive radiation by taking an example of finches?

 
HARD
12th CBSE
IMPORTANT
Xam Idea Biology>Chapter 20 - Model Question Papers 3>MODEL QUESTION PAPER>Q 27
What is meant by ecological succession? How does it occur? Explain.