MEDIUM
12th CBSE
IMPORTANT
Earn 100

Draw a labelled diagram of the sectional view of a mature pollen grain of angiosperms. Explain the function of any two of its parts.

Important Questions on Model Question Papers 2

MEDIUM
12th CBSE
IMPORTANT

Identify a, b, c, d, e and/in the following table:

Name of Enzyme/Bioactive
Molecule
Source Functions
(i) a Streptococcus b
(ii) c d immuno-suppressive agent in organ
transplant patients
(iii) Statins e f

 

MEDIUM
12th CBSE
IMPORTANT
Give reason for the following statement:
Antibody-mediated immunity is called humoral immunity.
 
MEDIUM
12th CBSE
IMPORTANT

Give reason for the following statement:

How is a child protected from a disease for which he/she is vaccinated ?

MEDIUM
12th CBSE
IMPORTANT
Give reason for the following statement:
Name the type of cells, the AIDS virus enters after getting into the human body.
 
HARD
12th CBSE
IMPORTANT
A vector is engineered with three features which facilitate its cloning within the host cell. List the three features and explain each one of them.
MEDIUM
12th CBSE
IMPORTANT
A crane had DDT level as 5 ppm in its body. What would happen to the population of such birds? Explain giving reasons.
MEDIUM
12th CBSE
IMPORTANT
Explain the role of t-RNA during translation and where does peptide bond formation occurs in a prokaryote?
MEDIUM
12th CBSE
IMPORTANT
Describe the various steps of Griffith's experiment that led to the conclusion of the 'transforming principle'.