The NEET 2021 exam on September 12 saw around 16 lakh candidates competing for medical seats in India. If you attempted the O1 paper from Series O, the official NEET 2021 O1 Answer Key helps you check your answers and estimate your score. This page provides a detailed table with all 200 questions and correct answers, making evaluation easy. Explore the O1 code for clarity on your results.
Details about the NEET 2021 O1 Answer Key
The NEET 2021 O1 answer key corresponds to the O1 paper from Series O, one of 24 unique question paper codes issued by NTA (spanning Series M, N, O, and P, each with six codes). The O1 paper had 200 questions (180 to be attempted) in Physics, Chemistry, and Biology, totaling 720 marks.
It followed a format with Section A (35 questions) and Section B (15 questions, 10 to be attempted). The O1 answer key was released on September 15, 2021, with the final key published on October 1, alongside the results.
The O1 paper had a tough Physics section, with about 50% of questions centered on thermodynamics—a commonly challenging topic. Chemistry was moderate, focusing on d and f block elements, while Biology was lengthy, requiring a detailed understanding of plant physiology.
Below is the complete NEET 2021 O1 Answer Key, listing all 200 questions and correct answers for easy comparison.
NEET 2021 O1 Answer Key PDF Download
Below, you’ll find all 200 questions and their correct answers in a table for easy reference.
Please download the NEET 2021 O1 Answer key PDF.
| Question No. | Answer |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 3 |
| 7 | 2 |
| 8 | 4 |
| 9 | 3 |
| 10 | 4 |
| 11 | 4 |
| 12 | 4 |
| 13 | 2 |
| 14 | 2 |
| 15 | 4 |
| 16 | 4 |
| 17 | 4 |
| 18 | 2 |
| 19 | 3 |
| 20 | 3 |
| 21 | 1 |
| 22 | 1 |
| 23 | 2 |
| 24 | 1 |
| 25 | 4 |
| 26 | 1 |
| 27 | 1 |
| 28 | 2 |
| 29 | 1 |
| 30 | 3 |
| 31 | 4 |
| 32 | 1 |
| 33 | 4 |
| 34 | 2 |
| 35 | 4 |
| 36 | 3 |
| 37 | 1 |
| 38 | 3 |
| 39 | 3 |
| 40 | 2 |
| 41 | 2 |
| 42 | 2 |
| 43 | 2 |
| 44 | 4 |
| 45 | 2 |
| 46 | 3 |
| 47 | 4 |
| 48 | 2 |
| 49 | 4 |
| 50 | 2 |
| 51 | 1 |
| 52 | 4 |
| 53 | 2 |
| 54 | 1 |
| 55 | 3 |
| 56 | 1 |
| 57 | 3 |
| 58 | 1 |
| 59 | 3 |
| 60 | 2 |
| 61 | 1 |
| 62 | 4 |
| 63 | 3 |
| 64 | 2 |
| 65 | 3 |
| 66 | 2 |
| 67 | 3 |
| 68 | 4 |
| 69 | 2 |
| 70 | 2 |
| 71 | 4 |
| 72 | 3 |
| 73 | 3 |
| 74 | 4 |
| 75 | 4 |
| 76 | 4 |
| 77 | 4 |
| 78 | 1 |
| 79 | 3 |
| 80 | 3 |
| 81 | 2 |
| 82 | 4 |
| 83 | 3 |
| 84 | 1 |
| 85 | 3 |
| 86 | 1 |
| 87 | 3 |
| 88 | 2 |
| 89 | 2 |
| 90 | 1 |
| 91 | 1 |
| 92 | 1 |
| 93 | 4 |
| 94 | 2 |
| 95 | 2 |
| 96 | 1 |
| 97 | 1 |
| 98 | 3 |
| 99 | 1 |
| 100 | 4 |
| 101 | 4 |
| 102 | 3 |
| 103 | 3 |
| 104 | 1 |
| 105 | 3 |
| 106 | 1 |
| 107 | 3 |
| 108 | 4 |
| 109 | 1 |
| 110 | 1 |
| 111 | 1 |
| 112 | 4 |
| 113 | 4 |
| 114 | 2 |
| 115 | 3 |
| 116 | 2 |
| 117 | 2 |
| 118 | 2 |
| 119 | 4 |
| 120 | 1 |
| 121 | 3 |
| 122 | 4 |
| 123 | 4 |
| 124 | 1 |
| 125 | 1 |
| 126 | 1 |
| 127 | 3 |
| 128 | 4 |
| 129 | 3 |
| 130 | 3 |
| 131 | 2 |
| 132 | 4 |
| 133 | 1 |
| 134 | 1 |
| 135 | 3 |
| 136 | 2 |
| 137 | 1 |
| 138 | 4 |
| 139 | 1 |
| 140 | 3 |
| 141 | 3 |
| 142 | 3 |
| 143 | 4 |
| 144 | 4 |
| 145 | 4 |
| 146 | 1 |
| 147 | 3 |
| 148 | 2 |
| 149 | 4 |
| 150 | 1 |
| 151 | 2 |
| 152 | 1 |
| 153 | 1 |
| 154 | 3 |
| 155 | 1 |
| 156 | 4 |
| 157 | 2 |
| 158 | 2 |
| 159 | 1 |
| 160 | 4 |
| 161 | 1 |
| 162 | 2 |
| 163 | 3 |
| 164 | 1 |
| 165 | 3 |
| 166 | 4 |
| 167 | 4 |
| 168 | 4 |
| 169 | 3 |
| 170 | 1 |
| 171 | 3 |
| 172 | 1 |
| 173 | 3 |
| 174 | 4 |
| 175 | 1 |
| 176 | 1 |
| 177 | 1 |
| 178 | 4 |
| 179 | 1 |
| 180 | 2 |
| 181 | 3 |
| 182 | 2 |
| 183 | 3 |
| 184 | 2 |
| 185 | 1 |
| 186 | 2 |
| 187 | 2 |
| 188 | 3 |
| 189 | 4 |
| 190 | 4 |
| 191 | 4 |
| 192 | 1 |
| 193 | 4 |
| 194 | 3 |
| 195 | 3 |
| 196 | 3 |
| 197 | 3 |
| 198 | 3 |
| 199 | 1 |
| 200 | 2 |
To explore other answer keys from Series S, check out the NEET 2021 O2 Answer Key, NEET 2021 O3 Answer Key, NEET 2021 O4 Answer Key, NEET 2021 O5 Answer Key, and NEET 2021 O6 Answer Key, For a full list of all 24 codes, visit the NEET 2021 Answer Key pillar page.
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