Read NCERT Biology once, but cannot explain the examples?
PrepArena · Published 25 September 2026 · Prepared with AI assistance
After a first read, you may recognise the page yet struggle to explain an example without looking. Before starting the whole chapter again, choose one example and check what is missing: the name, the comparison, or the conclusion.
For Evolution, try this small exercise. It is a suggested way to organise revision, not a tested NEET score-improvement method.
Turn an example into an explanation
Cover the paragraph and complete this sentence:
“The structures being compared are ____. They are similar in ____, differ in ____, and illustrate ____.”
You can leave a blank. The blank tells you what to look up; it is more useful for this exercise than guessing a familiar term.
Now check two NCERT examples:
| Comparison | What matters | Conclusion |
|---|---|---|
| Whale and bat forelimbs | Shared basic bone pattern, different uses | Homology; divergent evolution |
| Butterfly and bird wings | Similar flight function, different anatomical structures | Analogy; convergent evolution |
The comparison concerns these structures. Avoid shortening the note to “these animals are homologous” or “anything that flies is analogous.” NCERT XII Biology, Evolution, pp 114–115
Choose the next action from your own attempt
If you remembered the term but could not name the structures, return to the example and figure. Add the structures to your note.
If you remembered the example but could not explain the classification, reread the relevant comparison. Write the distinguishing feature beside the term, instead of copying a longer list of animal names.
If the passage remains unclear with the book open, take that exact comparison to your teacher. More closed-book attempts need not resolve an explanation you do not yet understand.
These are practical choices based on what you wrote, not a diagnosis of your memory or ability.
Check the relationship, not just the label
With the explanation covered, answer: “Why is a shared function alone insufficient to classify two organs as homologous?”
Check: their structural relationship and origin matter; a similar function alone is not enough.
Then explain one of the two examples again, naming the structures and the reason for your choice. This is a repeat check of material just reviewed, not evidence of unfamiliar-question performance.
In a later study session, try a relevant question from material you already own before opening its solution. Note whether you used help. There is no compulsory rereading count or universally best gap prescribed here, and success on one example does not establish mastery of Evolution.
If you need the broader attempt–check–revisit routine, use our revision guide. For this session, finish with one explanation you can check against NCERT and one specific unresolved point, if any.