List of top Biology Questions asked in Maharashtra Class XII

Distinguish between human sperm and ovum.
Define the following terms : (a) Gene flow (b) Chromosomal aberrations
Explain factors affecting water absorption.
Describe mutualism.
What is differentiation and redifferentiation?
Identify and define 'A' and 'B' in relation to uptake of water by the root :
How many meiotic divisions are required for the formation of 300 seeds in angiosperm?
Give the name of microbial source of antibiotic chloromycetin.
Explain the term Emigration.
What is the full form of IAA?
Arrange the following steps of DNA fingerprinting in correct sequence :

Gel electrophoresis
Isolation of DNA
Southern blotting
Restriction digestion
Which cells of islets of Langerhans produce a hormone insulin?
What are the reasons for the success of Mendel?
Give the name of endocrine gland which is prominent at birth but gets gradually atrophied in adult stage.
Which of the following types require pollinator but result is genetically similar to autogamy?
Recognition sequence of restriction enzymes are generally ______________ nucleotides long.
Which one of the following does not evolve further?
Which of the following is caused by unsterilized needle?
Observe the graph and select correct option :
Identify the appropriate term for the number of births under ideal conditions :
Identify the growth hormone in plants which causes inhibitory effect.
Which of the following divides nasal cavity?
What are the limitations of the root pressure theory?
Explain unique features of acquired immunity.
What are chromosomal disorders? Describe Turner’s syndrome and Klinefelter’s syndrome.