Q.119 Botany ⭐ 360° Option Elimination Active

NEET 2025 Botany Question 119 Solution

Topic: Plant Kingdom · Official NTA Booklet Code 45

Question

The correct sequence of events in the life cycle of bryophytes is A. Fusion of antherozoid with egg. B. Attachment of gametophyte to substratum. C. Reduction division to produce haploid spores. D. Formation of sporophyte. E. Release of antherozoids into water. Choose the correct answer from the options given below:

(1)D, E, A, C, B
(2)B, E, A, C, D
(3)B,E, A, D, C
(4)D, E, A, B, C

✓

Verified Against NTA Final Answer Key

Option (3) : B, E, A, D, C

📚 Plant Kingdom Medium

📋 Given Parameters & Problem Setup

Event A Fusion of antherozoid with egg

Event B Attachment of gametophyte to substratum

Event C Reduction division to produce haploid spores

Event D Formation of sporophyte

Event E Release of antherozoids into water

⚡

The 30-Second Exam Hall Shortcut: ⚡ Bryophyte Life Cycle Chronology Fingerprint

⏱️ Save ~30 seconds

Gametophyte attaches to substratum (B) -> Antherozoids released into water (E) -> Syngamy with egg (A) -> Zygote develops into Sporophyte (D) -> Spore mother cells undergo Meiosis (C)! Sequence: B -> E -> A -> D -> C!

1 Track the biological flow of bryophyte reproduction:

2 Gametophyte thallus attaches to substratum by rhizoids (B).

3 Antheridia mature and release biflagellate antherozoids into water (E).

4 Antherozoids swim to archegonium; fusion with egg produces zygote (A).

5 Zygote does not undergo meiosis immediately; it develops into a multicellular Sporophyte (foot, seta, capsule) (D).

6 Spore mother cells inside the capsule undergo reduction division (meiosis) to produce haploid spores (C).

7 Chronological order: B -> E -> A -> D -> C (Option 3)!

8 Select Option (3)!

🛡️

Why You Can 100% Trust This Shortcut: Bryophyte Life Cycle & Gametophyte Predominance (NCERT Biology · Plant Kingdom: Protonema and leafy stage in mosses).

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Establishment of the Gametophyte Generation

In bryophytes (mosses and liverworts), the dominant, independent, photosynthetic stage is the haploid gametophyte:

• The thalloid or leafy gametophyte attaches to the substratum by unicellular or multicellular rhizoids (Event B).

Step 2

Gamete Liberation and Syngamy

Sexual reproduction in moist environments:

• Male sex organs (antheridia) produce biflagellate antherozoids that are released into film of water (Event E).
• Antherozoids swim and reach the neck of the flask-shaped female sex organ (archegonium). An antherozoid fuses with the non-motile egg cell to form a diploid zygote (Event A).

Step 3

Sporophyte Development and Meiotic Spore Formation

Development of the parasitic sporophyte and spore dissemination:

• Zygotes do not undergo reduction division immediately. They divide mitotically to produce a multicellular diploid body called the sporophyte (differentiated into foot, seta, and capsule) attached to and nourished by the gametophyte (Event D).
• Some cells of the capsule (spore mother cells) undergo reduction division (meiosis) to produce haploid spores (Event C).
• These spores later disperse and germinate into new gametophytes, completing the alternation of generations.

Step 4

Conclusion

The natural biological progression is B -> E -> A -> D -> C, which corresponds to Option (3).

\text{Cycle: } B \rightarrow E \rightarrow A \rightarrow D \rightarrow C

⭐

360° Option Elimination Engine Key Feature

Diagnose every choice: Know exactly why the right option works and why distractors fail.

4-Option Deep Scan

1 A

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Starts with sporophyte formation (D) before gametophyte attachment or fertilisation.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing sporophyte with gametophyte initiation.

2 B

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Places reduction division (C) before sporophyte formation (D), which is impossible because reduction division occurs inside the capsule of the sporophyte.

⚠️

Student Fallacy (Why candidates pick this trap): Assuming zygote undergoes immediate meiosis (like in haplontic green algae).

3 C

✓ 100% Correct

Verdict & Scientific Reason:

100% correct. Correctly reflects the delay of reduction division until after multicellular sporophyte formation.

💡

Why this is airtight: None; rigorous understanding of bryophyte life cycle.

4 D

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Jumbles sporophyte generation with gamete release.

⚠️

Student Fallacy (Why candidates pick this trap): Random guessing.

⚠️

NTA Trap Alert: Immediate Zygotic Meiosis vs Sporophyte Formation

In haplontic algae (e.g., Volvox, Chlamydomonas), the zygote undergoes immediate meiosis. In bryophytes, NCERT emphatically notes: "Zygotes do not undergo reduction division immediately. They produce a multicellular body called a sporophyte." Therefore, D (Sporophyte) MUST precede C (Reduction division)!

🛡️ How to avoid the -1 mark: Never pick an option where C comes before D in bryophytes!

📖

Core NEET Syllabus Standard

NEET Biology Core Syllabus · Plant Kingdom Standard Benchmark

Core Scientific Principle Tested:

"Gametophyte anchors to substratum -> releases antherozoids -> fertilization forms zygote -> sporophyte develops -> meiotic reduction division produces spores."

Syllabus Focus: Bryophytes · Life Cycle and Reproduction

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

BE A Doc: B (Base attachment) -> E (Emission in water) -> A (Acquiring egg/Syngamy) -> D (Development of sporophyte) -> C (Capsule meiosis)!

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NEET 2025 Botany Question 119 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Bryophyte Life Cycle Chronology Fingerprint

Step-by-Step Rigorous Workflow & Mathematical Proof

Establishment of the Gametophyte Generation

Gamete Liberation and Syngamy

Sporophyte Development and Meiotic Spore Formation

Conclusion

360° Option Elimination Engine Key Feature

NTA Trap Alert: Immediate Zygotic Meiosis vs Sporophyte Formation

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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