1st Year Biology Unit 1 Notes (New Book 2025-26): Biodiversity and Classification – All Punjab Boards
How do biologists keep track of millions of different living things without getting lost? That question sits at the heart of Biodiversity and Classification, the opening unit of the new PECTAA Biology textbook for Class 11. Punjab introduced this book in the 2025-26 session, and the names, groups and ranks you meet here come back again and again in later units.
The 1st year biology unit 1 notes on this page gather six kinds of study material in a single download: MCQs, short questions, long questions, the solved exercise, definitions and labelled diagrams. The pages are colourful and the content is precise, and you pay nothing to download the file.
Avoid relying on notes written for the old Class 11 Biology book. The new textbook has its own units and its own end-of-unit exercises, so older material may follow different questions or skip parts of this unit.
Students from Lahore, Faisalabad, Bahawalpur, Dera Ghazi Khan and the other Punjab boards can use the same file. Read on for what each part of the notes is for, how the parts connect with paper questions, and a study plan for a unit packed with new terms.
About Unit 1 in brief
Biodiversity means the variety of living things, and classification is the practice of sorting organisms into groups according to features they share. Together, these two ideas give biologists an orderly way to name, compare and study life. The sections below explain the notes and leave the teaching of the unit to your textbook and teacher.
What’s inside the 1st year biology unit 1 notes
Six parts make up the Unit 1 file. Knowing the job of each one lets you choose the right part for the time you have, whether that is ten minutes before a class test or a long evening of revision.
MCQs
Multiple-choice questions test whether you can pick out the right term or group from options that look alike. Many words in a classification unit share the same roots and endings, so a hasty reading of the options can lead to a wrong choice even when you know the idea.
Try a set with the textbook closed and put a small tick beside any question you guessed. A lucky guess still points to a gap. Go back to the matching page of the book for those questions before you attempt another set.
Short questions
This part brings together short questions on Unit 1. In a unit about naming and grouping, short questions commonly ask you to define a term, state how two groups differ, or give a reason behind a naming rule.
Write your own reply in a few lines before checking it against the textbook or with your teacher. Choose the exact scientific word over a loose description, because one wrong term can change the meaning of an answer in biology.
Long questions
The long questions call for answers that develop an idea over several paragraphs. On this unit, a long question may ask you to explain a system of grouping, describe the features used to separate groups, or discuss why the variety of life matters.
Turn each long question into a short outline of headings in your notebook. The next day, write the answer from that outline alone, then check which points slipped out. Repeating this two or three times makes a long answer far easier to recall under time pressure.
Solved exercise
This part solves the end-of-unit exercise from the textbook. Because those questions come straight from the book, they are a dependable way to test yourself once you have read the unit.
Work through the exercise on rough paper before you look at any solution. Then compare your attempt line by line and jot down a short note on each mistake. That list of mistakes soon becomes a revision sheet of its own.
Definitions
A separate part collects definitions of key terms from the unit. Classification introduces a large number of new words in a short space, and stating them accurately is the base on which both short and long answers rest.
Learn a few definitions at a sitting. Cover one, say or write it from memory, then uncover it and compare. Watch for small words such as “only” or “at least”, which can change what a definition means.
Diagrams
The notes include labelled diagrams for Unit 1. In a topic about grouping, a drawing or chart can show how smaller groups fit inside larger ones more clearly than a paragraph of text.
Study one diagram, close the notes, and draw it again on blank paper with its labels. Compare your version with the original and redraw any part you missed or labelled wrongly.
Why these notes are useful
Classification brings many new terms at once. These features of the file are meant to help you revise them.
- Colourful pages. A colourful layout makes the notes easier to scan when you are looking for one term or one diagram in a hurry.
- Precise and to the point. Content stays tight and relevant to this unit, a good fit for a topic where getting the vocabulary right matters more than long explanations.
- Six parts in one download. MCQs, written questions, the solved exercise, definitions and diagrams sit together, saving you a search across several websites.
- Carefully prepared and checked. If anything still seems different from your textbook, follow the textbook and ask your teacher.
- Free for all nine Punjab boards. The file costs nothing and is meant for students of each board that follows the new book.
Notes help most after you have read the textbook and listened to your teacher’s explanation. Use them to practise and revise, not as a replacement for the book.
Which exam questions these notes help with
Each part of the file lines up with a type of question you are likely to see in an intermediate Biology paper, as the table shows. The paper pattern and the split of questions are set by your board, so look at its official pairing scheme and smart syllabus for the current session before planning around this table.
| Part of the notes | Kind of paper question it can help with |
| MCQs | Multiple-choice items in the objective section |
| Short questions | Brief written answers in the subjective section |
| Long questions | Extended answers that explain or describe |
| Solved exercise | Questions based on the textbook exercise |
| Definitions | Questions asking you to define a term or tell two terms apart |
| Diagrams | Questions asking for a labelled drawing, where the paper includes one |
Guess papers and lists of “important questions” for this unit spread quickly when exams draw near. None of these lists is official. Preparing the unit as a whole and reading what your board publishes is the safer approach.
How to study with these notes
Classification is easier to learn in small, regular sessions than in one long sitting. Try this eight-step plan:
- Begin with Unit 1 in your textbook. Underline each term you cannot yet explain in your own words.
- Build a term list. Write the underlined words in a notebook and fill in their meanings from the definitions part.
- Practise writing names correctly. For scientific names, start the genus with a capital letter, write the species name in small letters, and underline both words when writing by hand.
- Attempt the textbook exercise. Work on rough paper with the solutions kept aside.
- Check against the solved exercise. Mark your answers and note beside each error what led you to it.
- Practise the diagrams with the notes closed. Draw and label each one from memory, and repeat until every label is correct.
- Rehearse the short and long questions. Outline your answers, write them out, and compare with the textbook.
- Finish with a timed MCQ set. Revisit any weak term before moving on to Unit 2.
Keep your term list nearby while you study the units that follow; many of the same words will appear again.
Who should use these notes
FSc pre-medical students in Class 11 are the main audience for these notes. Private candidates and students in other groups who study Biology from the new book under a Punjab board are welcome to use them too.
If you are not sure whether your college has moved to the new edition, ask your teacher.
Download the notes
The notes for Unit 1 are free to download right here on this page, with no redirection to another website.
Save the file next to your term list and rough exercise work so that your notes, attempts and corrections stay together.
Frequently asked questions
Do these notes follow the new 2025-26 Biology book?
Yes. They are prepared for Unit 1, Biodiversity and Classification, of the PECTAA Class 11 Biology textbook, taught across Punjab since the 2025-26 session.
What parts does the Unit 1 file contain?
It contains MCQs, short questions, long questions, the solved textbook exercise, definitions of key terms and labelled diagrams.
How should I write scientific names in my answers?
Begin the genus with a capital letter and write the species in small letters. When writing by hand, underline both words of the name.
Is there any charge for the Biodiversity and Classification notes?
No. Downloading the Unit 1 file costs nothing.
Are the notes only for one board?
No. They suit students of all nine Punjab boards who learn from the new textbook, while the paper pattern for your exam comes from your own board’s pairing scheme.