Complete Guide to NDA biology syllabus for GAT 2026

The NDA biology syllabus for GAT encompasses fundamental life sciences, focusing on the diversity of living organisms, cell structure, human physiology, and basic ecology. While biology forms a portion of the General Science section, mastering these core topics is essential for securing a competitive edge in the UPSC-conducted written examination.

What is the Exam?

The National Defence Academy (NDA) examination is a prestigious, biannual national-level entrance test conducted by the Union Public Service Commission (UPSC) to recruit candidates into the Army, Navy, and Air Force wings of the NDA and the Indian Naval Academy Course (INAC). The General Ability Test (GAT) paper constitutes 600 marks out of the total 900, acting as a decisive factor for qualifying for the Service Selection Board (SSB) interview stage.

Key Highlights 2026

• Conducting Body: Union Public Service Commission (UPSC).
• Exam Mode: Offline (Pen and Paper).
• Total GAT Marks: 600.
• Biology Weightage: Typically 10 to 12 questions (approx. 40-48 marks).
• Negative Marking: One-third of the marks assigned to a question are deducted for every wrong answer.
• Language: Bilingual (English and Hindi).

Syllabus 2026

We at Exam Bhai have curated the following syllabus based on the latest UPSC trends, ensuring you cover the foundational concepts that appear most frequently in the GAT paper.

Exam Pattern

The GAT paper is bifurcated into two main sections: English and General Knowledge. General Science (including Biology) falls under the General Knowledge segment.

Understanding this structure is critical. Candidates looking to streamline their efforts should practice free mock tests for Defence on Exam Bhai to simulate the time constraints of the actual test.

Eligibility Criteria

As per the official notifications on upsc.gov.in, candidates must meet specific requirements:

• Age Limit: Must be between 16.5 and 19.5 years at the commencement of the course.
• Educational Qualification: For Army Wing, 10+2 pass; for Air Force and Navy wings, 10+2 pass with Physics, Chemistry, and Mathematics.
• Citizenship: Citizen of India, subject of Nepal/Bhutan, or a Tibetan refugee who came to India before Jan 1, 1962.
• Gender: Open to both male and female candidates as per latest government policies.

Application Process

1. Visit the official UPSC website at upsc.gov.in.
2. Complete the One-Time Registration (OTR) if you are a first-time user.
3. Fill in the detailed application form for the NDA & NA Examination.
4. Pay the requisite fee (exempted for SC/ST/Sons of JCOs/NCOs/ORs).
5. Select your preferred examination center and save the registration ID for future reference.

Preparation Strategy

Effective preparation for the NDA biology section requires a balanced approach between conceptual clarity and consistent practice. We at Exam Bhai recommend the following:

• Focus on NCERTs: The Biology questions in the GAT are predominantly based on Class 9th to 12th NCERT textbooks. Master these books thoroughly.
• Prioritize Human Physiology: This is the most weightage-heavy sub-topic. Focus on digestive and endocrine systems.
• Active Revision: Use flowcharts and tables for classification topics to improve recall speed.
• Strategic Mock Testing: To bridge the gap between theory and execution, candidates should access curated Defence subject-wise tests on Exam Bhai to track their progress.
• Previous Year Analysis: Analyze at least 10 years of past papers. UPSC frequently repeats concepts, even if the phrasing changes. To get started, you can explore detailed previous year analysis for Defence exams on Exam Bhai to identify repetitive patterns.

Cut-Off Trends

Cut-off marks for the NDA written examination are published annually by the UPSC on their official website, upsc.gov.in. Historically, the written exam cut-off typically ranges between 340 and 360 marks out of 900. However, the final selection cut-off is higher, including the SSB performance. We advise candidates to aim for at least 400+ to ensure a safe cushion for the merit list.

Frequently Asked Questions

Q1: Is Biology mandatory for NDA GAT? A: Yes, Biology is part of the General Science section in GAT. While you cannot skip it, you can balance it with other subjects to clear the overall cut-off.

Q2: Which book is best for NDA Biology? A: NCERT textbooks for classes 9th through 12th are the gold standard. Supplement these with high-quality summary notes.

Q3: How many questions appear from Biology in GAT? A: Typically, 10 to 12 questions are asked from the Biology syllabus in the GAT paper, covering approximately 40 to 48 marks.

Q4: Is the syllabus different for Army, Navy, and Air Force? A: No, the written examination syllabus is the same for all three wings of the NDA. The differentiation occurs during the final merit and branch allotment phases.

Q5: Can I skip Biology and still clear the GAT? A: While mathematically possible, it is not recommended. Biology is relatively scoring and quick to solve compared to complex Physics numericals, making it a high-return-on-investment subject.

Q6: What is the best way to revise Biology for NDA? A: Focus on consistent revision of diagrams and important scientific terms. Utilize practice portals to take daily quizzes to ensure the information remains fresh in your memory.