List of top Biology Questions asked in CBSE Class XI

Take one flower of the family Solanaceae and write its semi-technical description. Also draw their floral diagram.
Find and write down structures of 10 interesting small molecular weight biomolecules. Find if there is any industry which manufactures the compounds by isolation. Find out who are the buyers.
Draw a standard ECG and explain the different segments in it.
Cut a transverse section of young stem of a plant from your school garden and observe it under the microscope. How would you ascertain whether it is a monocot stem or a dicot stem? Give reasons.
What is a centromere? How does the position of centromere form the basis of classification of chromosomes. Support your answer with a diagram showing the position of centromere on different types of chromosomes.
What are the characteristic features of Euglenoids?
Try to collect all the currently accepted meanings for the word ‘species’. Discuss with your teacher the meaning of species in case of higher plants and animals on one hand, and bacteria on the other hand.
Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.
Why are the classification systems changing every now and then?
Illustrate the taxonomical hierarchy with suitable examples of a plant and an animal.
Draw the diagram of a sarcomere of skeletal muscle showing different regions.
How useful is the study of the nature of body cavity and coelom in the classification of animals?
Name the three basic tissue systems in the flowering plants. Give the tissue names under each system.
Write a note on economic importance of algae and gymnosperms.
Mention the ploidy of the following: protonemal cell of a moss; primary endosperm nucleus in dicot, leaf cell of a moss; prothallus cell of a ferm; gemma cell in Marchantia; meristem cell of monocot, ovum of a liverwort, and zygote of a fern.
When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm and an angiosperm?
What is the basis of classification of algae?
Organise a discussion in your class on the topic – Are viruses living or non-living?
Give a brief account of viruses with respect to their structure and nature of genetic material. Also name four common viral diseases.
Give a comparative account of the classes of Kingdom Fungi under the following:
  1. mode of nutrition
  2. mode of reproduction
What do the terms phycobiont and mycobiont signify?
Plants are autotrophic. Can you think of some plants that are partially heterotrophic?
Describe briefly the four major groups of Protozoa.
How are viroids different from viruses?
What is the nature of cell-walls in diatoms?