Which of the following is/are essential features of a concept map in mathematics ?
A. It represents a conceptual analysis of a concept using contributory sub-concepts.
B. They are directional, with arrows showing which concepts are prerequisite for which others.
C. They cannot be used for diagnostic purposes to identify difficulties in learning a particular concept.
D. They cannot be used frequently as they are very time consuming.
Choose the correct option :

The correct option is A and B.

Concept Maps in Mathematics:
A concept map is a visual organizer that represents relationships between ideas, terms, or mathematical concepts. Key features include:

1. Conceptual Analysis (Feature A): It systematically breaks down a complex mathematical concept into its fundamental contributory sub-concepts, showing how foundational ideas connect to form broader knowledge structures.

2. Directional Relationship (Feature B): Concept maps use directional links (arrows) to illustrate dependencies and prerequisite relationships, demonstrating which prior concepts are needed before moving on to advanced ones.

3. Diagnostic Utility: Contrary to statement C, concept maps are widely used as effective diagnostic tools by educators to uncover misconceptions and learning gaps in students.

4. Efficiency & Frequency of Use: Contrary to statement D, concept maps can be constructed and utilized frequently in classroom instruction to summarize and reinforce learning efficiency.

Therefore, statements A and B are the essential features of a concept map in mathematics.