Question

which biology diagrams are important?

Answer 1

diagrams of female reproductive system . flower, heart, all the bacteria, etc....

Answer 2

I am not sure for which class syllabus you are talking about. So, I will give a general idea about the biology diagrams of the higher CBSE classes.

Drawing a diagram neatly and labeling it correctly on a single side is important to impress the examiner. A few examples of the important biology diagrams are - 

Anatomy of human body organs and tissues like - Neuron, Brain, The Reflex arc, Nephron, Endocrine glands in males and females, reproductive system in males and females, Internal structure of the heart, respiratory system, digestive system, cross-section of a leaf, L.S of a flower, Amoeba (structure, nutrition, etc.), Germination of pollen, Budding in Hydra, Spore formation in Rhizospora, etc.