Difficulty distribution
How the classified questions are distributed by difficulty.
75questions
Not classified
75
100%
Biology Previous Year Questions
Practice Biology previous year questions organised from real papers, with year-wise coverage and clear topic navigation.
5Papers
5Years
75Questions
2Topics
Biology question pattern
Every graph below is calculated only from this selection.
Questions by year
Year-wise coverage for Biology. Each bar uses a separate theme-derived color.
Question type distribution
MCQ, numerical, multiple-select and other formats found in these papers.
75questions
Multiple Choices
75
100%
Subject weightage
Top subjects by unique question coverage.
Most asked topics
Top topics across the included previous year papers.
Subtopic coverage
Top subtopics inside this exact selection.
Paper coverage
Question coverage for the most populated papers. Every active PYP paper remains listed below.
Browse by topics
Open a focused page built from the same verified paper data.
Included previous year papers
Newest papers appear first. Sort by year, question coverage or name.
| Paper | Year / session | Questions in this view | Open |
|---|---|---|---|
| IAT IISER 2025 | 2025 | 15 | View paper |
| IAT IISER 2024 | 2024 | 15 | View paper |
| IAT IISER 2023 | 2023 | 15 | View paper |
| IAT IISER 2022 | 2022 | 15 | View paper |
| IAT IISER 2020 | 2020 | 15 | View paper |
Sample previous year questions
A varied preview from the papers represented in this selection, with every available option.
2020 · Biology · Botany · Cell Cycle And Cell Division
IAT IISER 2020
$$\text { Match the human cell types or (column I) to the number of chromatids (column II) }$$
| Column I | Column II | ||
|---|---|---|---|
| (a) | Col\(G_2 \text { phase cells } \) |
(i) | 46 |
| (b) | $$ G_1 \text { phase cells } $$ |
(ii) | 92 |
| (c) | Spermatogonia (pre-replication) |
(iii) | 23 |
| (d) | Ovum | ||
2022 · Biology · Botany · Cell Cycle And Cell Division
IAT IISER 2022
Let ' $X$ ' be the perpendicular distance from the centromere of each chromosome to the equatorial plane of a human cell. Which of the following stages of the cell cycle is most likely to have the HIGHEST average value of $X^{\prime}$ ?
2023 · Biology · Botany · Biomolecules
IAT IISER 2023
Match the biomolecules given in Column I with their corresponding chemical nature given in Column II.
| Column I | Column II | ||
| P. | Insulin | (i) | Secondary metabolite |
| Q. | Inulin | (ii) | Homopolymer |
| R. | Lectin | (iii) | Quaternary ammonium derivative |
| S. | Lecithin | (iv) | Hetropolymer |
2024 · Biology · Botany · Biotechnology Principles And Processes
IAT IISER 2024
Which of the following plasmid vectors can be used for cloning of a gene, with restriction enzymes BamHI and EcoRI, and ampicillin-containing nutrient agar for selection? [Ori - origin of replication; $\mathrm{Amp}^R$ - gene for ampicillin resistance]
A
B
C
D
2025 · Biology · Botany · Biomolecules
IAT IISER 2025
Which one of the following options describes a triglyceride?
2020 · Biology · Botany · Mineral Nutrition
IAT IISER 2020
Which of the following processes increases the uptake of water and minerals by roots in legumes?
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