List of top Questions asked in UP Board XII- 2026

Describe the method of separation and isolation of fragments generated on cutting of DNA by restriction endonuclease.
Define linkage. Explain the effect of linkage on inheritance of two genes.
With the help of a suitable diagram, describe the functions of the vegetative and generative cells of mature pollen grains.
Write a short note on polyembryony.
Name the pathogenic organisms of the following diseases: (i) Pneumonia (ii) Amoebiasis (iii) Ascariasis (iv) Filaria.
Explain two phenomena which lead to variation in DNA.
Why is the pyramid of energy never inverted? Explain.
What do you mean by detritus and detritivores?
Write the two general laws of inheritance proposed by Mendel.
Name any two autosome linked recessive disorders.
Name the two strands of the structural gene DNA of a transcription unit.
How many chromosomes are found in primary spermatocytes and secondary oocytes of a human being?
Give an example of an ecosystem where the pyramid of biomass is inverted.
The phenotypic ratio of classical Mendelian dihybrid cross is:
Name the type of pollination found in cleistogamous flowers. Give one example.
Which of the following is an attribute characteristic of a population?
The enzyme that makes a cut at a specific position within the DNA is called:
Testosterone hormone is synthesized and secreted by:
Describe the applications of biotechnology in agriculture.
Describe negative interactions in plants with example.
Describe the sex determination in human and honeybee.
State detail account of any two drugs obtained from plants and their effect.
Write an essay on population stabilization.
Which type of population interaction is found in lichen? Describe.
What is primary productivity? Discuss in brief the factors affecting the primary productivity.