What is the estimated time frame for when giant ferns became coal deposits?

What is the estimated time frame for when giant ferns became coal deposits?
  1. 100 million years ago
  2. 200 million years ago
  3. 65 million years ago
  4. 20 million years ago

Solution

Giant ferns were present but they all fell to form coal deposits slowly, which happened around 200 million years ago.

Asked in: NCERT

Practice more Evolution questions on Aicharya