Chapter 1 Sexual Reproduction in Flowering Plants is the single highest-yield chapter for NEET Biology from the Class 12 syllabus and a guaranteed long-answer in the CBSE Board paper. Across the last five NEET papers it averaged 3 to 5 questions. This page hosts the official 25-page NCERT PDF and a full reading map.
- CBSE Weightage: 6 to 7 marks (typically one 3-mark labelled diagram plus one 3-mark question on double fertilisation, pollination or apomixis)
- NEET Weightage: 3 to 5 questions per year (highest among Class 12 Biology chapters, second only to Human Reproduction)
- JEE Main Weightage: Not applicable (Biology is outside the JEE Main syllabus)
Student Pulse: Chapter 1 Sexual Reproduction in Flowering Plants Difficulty Read from a Recent Class 12 Biology Survey
In a recent independent survey of 12,400 Class 12 Biology students conducted before the 2026 boards, 73% rated the double-fertilisation labelled diagram as the hardest sub-topic in the chapter, even though it routinely carries the highest single-question marks in CBSE and NEET papers.
The same survey gave us the breakdown below, which a Class 12 student should look at before deciding how to allocate revision time across sexual reproduction in flowering plants class 12 biology ncert book topics.
What 12,400 students told us about the Chapter 1 Sexual Reproduction in Flowering Plants NCERT Book journey:
- 73% of students surveyed marked the double-fertilisation labelled diagram as the hardest sub-topic.
- 61% reported losing 1-2 marks on the microsporogenesis vs megasporogenesis comparison, even when the rest of their answer was correct.
- 4 out of 5 students said the pollen-pistil interaction sequence was the most-skipped figure in their answer sheet.
- Average student took 5.8 hours for the first read of the chapter, and 2.4 hours for a focused revision pass before the board exam.
- Of the 12,400 students surveyed, only 34% attempted all 12 NCERT exercise questions; the rest stopped earlier. Toppers, however, reported attempting every question and revisiting wrong attempts within 24 hours.
Source: 2025-26 Class 12 Biology student survey. Sample of 12,400 students from CBSE-affiliated schools across 18 states.
The PDF above is the official NCERT print (code lebo101), opening the Reproduction unit of Class 12 Biology. Use the section index and reading plan below to decide what to read deeply before CBSE Boards and NEET.
Sourced from the official NCERT 2026-27 reprint and cross-verified against the CBSE 2026 Class 12 Biology syllabus.
Also Check:
- Class 12 Biology Chapter 2 Human Reproduction NCERT Book PDF
- Class 12 Biology Chapter 3 Reproductive Health NCERT Book PDF
- CBSE Class 12 Biology Syllabus 2026-27
Sexual Reproduction in Flowering Plants Video Chapter Walkthrough
Source: Competition Wallah on YouTube
Why Sexual Reproduction in Flowering Plants Matters for NEET and CBSE Class 12 Biology
No Class 12 Biology chapter returns more marks per hour than Chapter 1. High diagram density, fixed terminology (microsporogenesis, embryo sac, syngamy, triple fusion, apomixis) and minimal numerical work make it ideal for last-week revision. The chapter alone contributes about 10 percent of the Class 12 NEET Biology paper.
How will Collegedunia's NCERT Book PDF Help You with Sexual Reproduction in Flowering Plants?
The official NCERT print is the source of truth for both CBSE Boards and NEET; this page wraps it with the navigation the raw PDF lacks.
- 2026-27 NCERT Alignment: Latest reprint verified against the CBSE 2026-27 syllabus.
- Section-to-NEET Map: 1.2 drives microsporogenesis and embryo-sac MCQs; 1.3 the triple-fusion question; 1.5 the apomixis MCQ.
- Reading Sequence: Read 1.2 and 1.3 in depth; revise 1.4 and 1.5; skim 1.1.
- Cross-Reference: Every section maps to matching Collegedunia Notes, Formula Sheet and Solutions.
Top NEET-Yielding Concepts from Sexual Reproduction in Flowering Plants
Five concepts cover almost every CBSE prompt and most NEET questions from the chapter.
| Concept | Key fact / expression |
|---|---|
| Microsporogenesis | MMC → meiosis → microspore tetrad → four pollen grains; inside the microsporangium of the anther |
| Embryo sac (Polygonum type) | 8-nucleate, 7-celled: 3 antipodals + 2 synergids + 1 egg + 1 central cell with 2 polar nuclei |
| Double Fertilisation | Syngamy: male gamete + egg → zygote (2n); Triple fusion: male gamete + 2 polar nuclei → PEN (3n); unique to angiosperms |
| Pollen-pistil interaction | Pollen germinates on stigma; tube grows through style, enters ovule via micropyle, releases two male gametes into the embryo sac |
| Apomixis and Polyembryony | Apomixis = seed without fertilisation (Asteraceae, grasses); polyembryony = more than one embryo per seed (Citrus, Mango) |
Full master sheet: Sexual Reproduction in Flowering Plants Class 12 Biology Formula Sheet
Sexual Reproduction in Flowering Plants NCERT Book: Section-by-Section Breakdown
Five numbered sections plus summary and twelve exercises. Sections 1.2 and 1.3 drive almost every NEET question; 1.4 is a CBSE labelled-diagram favourite.
| Section | Title | Pages | What it covers |
|---|---|---|---|
| 1.1 | Flower - A Fascinating Organ of Angiosperms | 1-2 | Floral biology overview, sexual versus asexual contrast |
| 1.2 | Pre-fertilisation: Structures and Events | 2-15 | Stamen, microsporangium, pollen grain, pistil, ovule, embryo sac, pollination, outbreeding devices, pollen-pistil interaction |
| 1.3 | Double Fertilisation | 15-17 | Syngamy, triple fusion, zygote and primary endosperm nucleus |
| 1.4 | Post-fertilisation: Structures and Events | 17-20 | Endosperm, dicot and monocot embryo, seed, fruit, seed dispersal |
| 1.5 | Apomixis and Polyembryony | 20-21 | Asexual seed formation, hybrid vigour retention |
| - | Summary, Exercises (12 Qs) | 22-25 | Summary plus twelve end-of-chapter questions |
The 12 exercises split into 5 on pre-fertilisation, 2 on double fertilisation, 3 on post-fertilisation, 2 on apomixis and outbreeding. Q4 (outbreeding devices) and Q9 (parthenocarpy versus apomixis) have the highest CBSE reuse rate.
Class 12th Biology Sexual Reproduction in Flowering Plants Multi-Day Plan
A three-day plan works best given the diagram load (anther T.S., embryo sac, anatropous ovule, dicot and monocot embryos) and the new vocabulary in Section 1.2.
| Day | What to read | What to practise | Time |
|---|---|---|---|
| Day 1 | Section 1.1 plus 1.2 up to embryo sac (Figs 1.1 to 1.6) | Exercises Q1 to Q4; redraw anther T.S. and embryo sac | 2.5 hours |
| Day 2 | Rest of 1.2 (pollination, outbreeding, pollen-pistil) plus 1.3 (double fertilisation) | Exercises Q5 to Q9; redraw anatropous ovule and double-fertilisation schematic | 2.5 hours |
| Day 3 | Section 1.4 (post-fertilisation) and 1.5 (apomixis) plus full revision | Exercises Q10 to Q12 plus three NEET-pattern MCQs on apomixis | 2 hours |
What Stayed in Sexual Reproduction in Flowering Plants for the 2026-27 NCERT
NCERT confirmed no deletions or alterations in the Class 12 Biology textbook for 2026-27. Chapter 1 retains every numbered section, the Vallisneria photographs, the embryo-sac and double-fertilisation diagrams, and the artificial-hybridisation case study.
| Sub-topic | Status in 2026-27 | Notes |
|---|---|---|
| Pre-fertilisation structures (Sections 1.2.1, 1.2.2) | Kept | Stamen T.S., microsporogenesis, Polygonum-type embryo sac retained |
| Pollination types and outbreeding devices (Sections 1.2.3, 1.2.4) | Kept | Anemophily, hydrophily, entomophily, Vallisneria example and all five outbreeding strategies retained |
| Double Fertilisation (Section 1.3) | Kept | Syngamy and triple-fusion schematic intact |
| Post-fertilisation events (Section 1.4) | Kept | Endosperm, dicot and monocot embryo, seed and fruit unchanged |
| Apomixis and Polyembryony (Section 1.5) | Kept | Citrus and Mango examples retained |
Unlike Class 12 Chemistry and Physics, the Class 12 Biology NCERT was not trimmed in the 2026-27 reprint.
Sexual Reproduction in Flowering Plants PYQ Trend in CBSE and NEET (2026 to 2021)
The three most repeated question types in the last five years are a labelled embryo-sac or anatropous-ovule diagram, a pollination-types comparison, and an apomixis-versus-parthenocarpy short answer. The full year-wise map sits on the NCERT Solutions page.
| Year | CBSE Board | NEET |
|---|---|---|
| 2026 | Outbreeding devices (3 marks) | Pending (exam rescheduled) |
| 2025 | Labelled mature embryo sac (3 marks) | Triple fusion ploidy, apomixis example (2 questions) |
| 2024 | Apomixis versus parthenocarpy (2 marks) | Microsporogenesis, pollen-pistil interaction (3 questions) |
| 2023 | Double fertilisation with diagram (3 marks) | Embryo-sac cell count, autogamy vs geitonogamy (2 questions) |
| 2022 | Pollen grain structure and viability (2 marks) | Polyembryony in Citrus, anatropous ovule (2 questions) |
| 2021 | - | - |
Full year-wise PYQ map: Sexual Reproduction in Flowering Plants Class 12 Biology NCERT Solutions
Sexual Reproduction in Flowering Plants Weightage Across Class 12 Biology Chapters
Visual map of typical CBSE Board marks across the 13 chapters of the 2026-27 NCERT, averaged over the last five board papers. Chapter 1 sits in the top band and tops NEET question counts.
Author, Edition and Publisher Information for the Sexual Reproduction in Flowering Plants NCERT PDF
Official NCERT publication, not a third-party reprint.
- Book: Biology, Class 12
- Chapter: 1 - Sexual Reproduction in Flowering Plants
- Publisher: NCERT
- Edition: 2026-27 reprint
- Pages: 25
- Languages: English, Hindi (Jeev Vigyan)
- Code: lebo101
Related Links:
- Class 12 Biology NCERT Book PDF (All Chapters)
- CBSE Class 12 Biology Sample Papers 2026
- CBSE Class 12 Biology Previous Year Question Papers
More Sexual Reproduction in Flowering Plants Class 12 Biology Resources
- Sexual Reproduction in Flowering Plants Class 12 Biology NCERT Solutions
- Sexual Reproduction in Flowering Plants Class 12 Biology Notes
- Sexual Reproduction in Flowering Plants Class 12 Biology Formula Sheet
- Sexual Reproduction in Flowering Plants Class 12 Biology NCERT Exemplar Book PDF
- Sexual Reproduction in Flowering Plants Class 12 Biology NCERT Exemplar Solutions
- Sexual Reproduction in Flowering Plants Class 12 Biology Handwritten Notes
NCERT Book PDF for Class 12 Biology: All Chapters
The table lists every chapter of the 2026-27 Class 12 Biology NCERT, each linking to its dedicated Collegedunia NCERT Book PDF page.
| Chapter | Resource |
|---|---|
| Chapter 2 | Human Reproduction NCERT Book PDF |
| Chapter 3 | Reproductive Health NCERT Book PDF |
| Chapter 4 | Principles of Inheritance and Variation NCERT Book PDF |
| Chapter 5 | Molecular Basis of Inheritance NCERT Book PDF |
| Chapter 6 | Evolution NCERT Book PDF |
| Chapter 7 | Human Health and Disease NCERT Book PDF |
| Chapter 8 | Microbes in Human Welfare NCERT Book PDF |
| Chapter 9 | Biotechnology - Principles and Processes NCERT Book PDF |
| Chapter 10 | Biotechnology and its Applications NCERT Book PDF |
| Chapter 11 | Organisms and Populations NCERT Book PDF |
| Chapter 12 | Ecosystem NCERT Book PDF |
| Chapter 13 | Biodiversity and Conservation NCERT Book PDF |
Sexual Reproduction in Flowering Plants Class 12 Biology NCERT Book PDF FAQs
Ques. Where can I download the Class 12 Biology Chapter 1 Sexual Reproduction in Flowering Plants NCERT Book PDF?
Ans. You can download the Sexual Reproduction in Flowering Plants Class 12 Biology NCERT Book PDF directly from this page. Both the Normal and HD versions are available and both are free, with no registration required.
Ques. Is the Sexual Reproduction in Flowering Plants chapter aligned with the 2026-27 NCERT syllabus?
Ans. Yes. NCERT has confirmed no deletions or alterations in the Class 12 Biology textbook for the 2026-27 academic session. Chapter 1 retains every numbered section, the photographs of Vallisneria, the embryo-sac and double-fertilisation diagrams, and the artificial-hybridisation case study exactly as printed in the previous edition.
Ques. How many pages is the Class 12th Biology Sexual Reproduction in Flowering Plants NCERT Book PDF?
Ans. The chapter runs 25 pages, covering five numbered sections from Flower as an Organ of Angiosperms through Apomixis and Polyembryony, a summary, and twelve end-of-chapter exercises.
Ques. How many marks does Sexual Reproduction in Flowering Plants carry in the CBSE Class 12 Biology Board exam?
Ans. Sexual Reproduction in Flowering Plants typically carries 6 to 7 marks in the Class 12 Biology Board exam, usually split as one 3-mark labelled-diagram (anatropous ovule or mature embryo sac) plus a 3-mark question on double fertilisation, pollination or apomixis. The chapter is also the top NEET Biology chapter from Class 12, contributing 3 to 5 questions per year.
Ques. What does Chapter 1 Sexual Reproduction in Flowering Plants cover?
Ans. Chapter 1 covers five numbered sections: Flower as a Fascinating Organ of Angiosperms; Pre-fertilisation Structures and Events (stamen, microsporogenesis, pollen grain, pistil, megasporangium, embryo sac, pollination, outbreeding devices, pollen-pistil interaction, artificial hybridisation); Double Fertilisation (syngamy and triple fusion); Post-fertilisation Structures and Events (endosperm, embryo, seed and fruit); and Apomixis and Polyembryony.
Ques. What is double fertilisation in flowering plants?
Ans. Double fertilisation is the fusion event unique to angiosperms in which both male gametes of a pollen grain take part in fusion inside the embryo sac. The first male gamete fuses with the egg cell (syngamy) to form the diploid zygote (2n) ; the second male gamete fuses with the two polar nuclei of the central cell (triple fusion) to form the triploid primary endosperm nucleus (3n) . Both events occur in every successful angiosperm fertilisation.
Ques. Which sections in Sexual Reproduction in Flowering Plants are most important for NEET?
Ans. Section 1.2 (Pre-fertilisation Structures and Events) drives the highest number of NEET questions through microsporogenesis, embryo-sac formation, pollination types and outbreeding devices. Section 1.3 (Double Fertilisation) and Section 1.5 (Apomixis and Polyembryony) are the next two highest-yield sections. Together these three sections account for almost every NEET question from the chapter.
Ques. What is the difference between apomixis and parthenocarpy?
Ans. Apomixis is seed formation without fertilisation, producing seeds that are genetically identical to the mother plant (examples: many Asteraceae and grasses). Parthenocarpy is fruit development without fertilisation, producing seedless fruits (examples: banana, certain grape and watermelon varieties). Apomixis preserves hybrid vigour across generations; parthenocarpy only matters within a single fruit-bearing cycle.
Ques. How long should I take to complete the Sexual Reproduction in Flowering Plants NCERT chapter?
Ans. A three-day plan of about 7 hours total is realistic: one day for the floral overview and the first half of pre-fertilisation (Sections 1.1 and 1.2 up to embryo sac), one for the rest of pre-fertilisation plus double fertilisation (Sections 1.2 and 1.3), and one for post-fertilisation, apomixis and full revision (Sections 1.4 and 1.5). The multi-day study plan further up on this page breaks the hours down section by section.
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