Types of Anther Fixation – Correct Matching with Explanation

Understanding types of anther fixation is an important topic in plant morphology and frequently asked in
competitive exams like NEET, CBSE, and State PSC. In this question, we match different anther diagrams
(P, Q, R, S) with their correct type of attachment to the filament.

✅ Correct Answer: (A) P-1, Q-4, R-6, S-3

1. Basifixed Anther (P → 1)

Definition: The filament is attached at the base of the anther.

• Rigid attachment
• No free movement
• Common in many flowering plants

Reason: Diagram P shows attachment only at the bottom; therefore it is Basifixed.

2. Adnate Anther (Q → 4)

Definition: The filament is fused with the anther along its entire length.

• Sidewise fusion
• No swinging movement
• Looks fully attached

Reason: Diagram Q shows the filament attached along the whole anther body, indicating Adnate fixation.

3. Versatile Anther (R → 6)

Definition: The anther is attached at one point and swings freely.

• Pivot-like attachment
• Moves easily
• Common in wind-pollinated plants (grasses)

Reason: Diagram R shows free swinging movement, so it represents Versatile fixation.

4. Dorsifixed Anther (S → 3)

Definition: The filament is attached to the dorsal (back) side of the anther.

• Moderate movement possible
• Common type of fixation

Reason: Diagram S shows attachment at the back side, hence it is Dorsifixed.

Final Matching Table

Why Other Options Are Incorrect?

• Option B: Incorrect matching of Q
• Option C: Q wrongly placed as Basifixed
• Option D: P wrongly marked Adnate

Hence, only Option A correctly matches all anther types.

Quick Memory Trick

BAVD → Base, Adnate, Versatile, Dorsal

Order corresponds to diagrams P → Q → R → S.