List of top Biology Questions asked in CBSE Class XI

Draw the structure of the amino acid, alanine.

Describe the events taking place during interphase.

Distinguish anaphase of mitosis from anaphase I of meiosis.

Differentiate between:
(a) Respiration and Combustion 
(b) Glycolysis and Krebs’ cycle 
(c) Aerobic respiration and Fermentation

Give the schematic representation of glycolysis?

Give the schematic representation of an overall view of Krebs’ cycle.

Explain ETS.

Explain the process of inspiration under normal conditions.

What is the difference between lymph and blood?

How does cytokinesis in plant cells differ from that in animal cells?

Describe the evolutionary change in the pattern of heart among the vertebrates.

Distinguish cytokinesis from karyokinesis.

Differentiate between :
(a) Racemose and cymose inflorescence
(b) Apocarpous and syncarpous ovary

How is a pinnately compound leaf different from a palmately compound leaf?

Give a brief account of the counter current mechanism.

What is the significance of juxta glomerular apparatus (JGA) in kidney function?

How do you distinguish between a skeletal muscle and a cardiac muscle?

Write the difference between: 
(a) Actin and Myosin 
(b) Red and White muscles 
(c) Pectoral and Pelvic girdle

Define sliding filament theory of muscle contraction.

Diagrammatically indicate the location of the various endocrine glands in our body.

Briefly mention the mechanism of action of FSH.

Match the following (column I with column II) Column I Column II (a) Chlamydomonas (i) Moss (b) Cycas (ii) Pteridophyte (c) Selaginella (iii) Algae (d) Sphagnum (iv) Gymnosperm