List of top Questions asked in UP Board XII

Briefly describe the mechanism of transcription in prokaryotes.
Give a brief account of different population growth models.
Describe in detail energy flow in an ecosystem.
Exine layer of pollen grain is made up of
Which one of the following is not a stop terminator codon?
Describe the law of independent assortment in a dihybrid cross.
Write short note on primary and secondary lymphoid organs.
Describe the structure of a typical biogas plant with the help of a suitable diagram.
Write short notes on the following: (i) Vaccination (ii) Bio-fertilizer
Describe the applications of r-DNA technology in medicine.
Differentiate between innate immunity and acquired immunity giving suitable examples.
What are cloning vectors? Write a short note on characteristics of cloning vectors.
What are transgenic animals? Describe the benefits of transgenic animals in brief.
What is multiple allelism? Give an example.
Give a brief account of different components of a nucleotide.
Draw a well-labelled diagram of an antibody molecule.
What is age pyramid? Give a diagrammatic representation of the age pyramid of an expanding human population.
Comment upon Gause’s "competitive exclusion principle".
Describe the process and importance of artificial hybridization in brief.
Write a note on Intra-Uterine Devices (IUD’s) and their applications.
Write a note on enzymes used in DNA replication.
Write the names of different parts of a typical stamen.
Name the hormone synthesised and secreted by Leydig cells.
What are alleles?
Give names of any two artificial ecosystems.