List of top Questions asked in Maharashtra Board Class XII Exam

What are chromosomal disorders? Describe Turner's syndrome and Klinefelter's syndrome.
Describe nervous system in planaria with well labelled diagram.
Explain following terms : (a) Grafting \quad (b) Apomixis \quad (c) Polyembryony \quad (d) Parthenocarpy
Explain the steps involved in preliminary treatment of sewage.
Give the different steps involved in formation of m-RNA from hn-RNA.
What is reproductive isolation? Describe any two types each of pre-mating and post-mating isolating mechanism.
Explain unique features of acquired immunity.
Name and describe hormones secreted by ovaries.
Explain different steps involved in PCR technique.
Identify A, B, and C from the above diagrams and give their functions.
What are the limitations of root pressure theory?
Distinguish between human sperm and ovum.
Enlist the uses of gene therapy.
Define the following terms : (a) Gene flow (b) Chromosomal aberrations
What are the significances of double fertilization?
Identify and define 'A' and 'B' in relation to uptake of water by the root :
Describe mutualism.
Explain factors affecting water absorption.
What is differentiation and redifferentiation?
Select and rewrite appropriate disorder of respiratory system with the given symptoms : [ sinusitis, emphysema, silicosis and asbestosis, laryngitis ]
Give the name of endocrine gland which is prominent at birth but gets gradually atrophied in adult stage.
What is the full form of IAA?
Give the name of microbial source of antibiotic chloromycetin.
Which cells of islets of Langerhans produce a hormone insulin?
How many meiotic divisions are required for the formation of 300 seeds in angiosperm?