2025 source guide · Biology

NEET 2025 Biology Questions

Use this page to connect the official 2025 paper with current Biology practice. NeetVellum does not claim a chapter appeared in that paper until the official question and final key have been mapped.

Practice 3486 verified questions →Check official NTA archive ↗

Original practice preview

These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.

Example 1 · difficulty 3/5

In the species-area relationship log S = log C + Z log A, the regression coefficient Z is usually 0.1 to 0.2 for small islands (e.g., plants in Britain) but rises to 0.6 to 1.2 for vast continental tracts such as tropical forests. A very steep slope (high Z value) indicates that:

A. species richness climbs sharply with area, so even a moderate shrinkage of habitat eliminates a disproportionately large number of species
B. species richness stays practically unchanged as the sampled area increases
C. beyond a certain point, exploring additional area yields virtually no new species
D. the community is dominated by generalist species with very wide geographic ranges

Example 2 · difficulty 2/5

Species diversity generally decreases from the equator towards the poles. Evaluate the following proposed explanations for the greater biodiversity of the tropics: (i) Tropical environments, being less seasonal and more constant, promote niche specialisation; (ii) Temperate regions underwent repeated glaciations, giving them extra time for speciation; (iii) The tropics receive greater solar energy, supporting higher productivity. Which combination is correct?

A. (i) and (ii) only
B. (i) and (iii) only
C. (ii) and (iii) only
D. (i), (ii) and (iii)

Example 3 · difficulty 2/5

David Tilman and colleagues performed long-term ecosystem experiments using outdoor plots in which the number of species was deliberately manipulated. Their principal finding was:

A. plots with fewer species produced more biomass yet fluctuated less between years
B. species richness had no measurable influence on productivity or stability
C. productivity rose with diversity, but year-to-year variation in biomass also rose
D. plots with greater species richness showed higher productivity and smaller year-to-year fluctuations in total biomass

The evidence-first practice loop

1. Verify provenanceOfficial paper and final key before accepting a PYQ label.
2. Attempt closed-bookExpose the concept or execution gap before rereading.
3. Repair and returnClassify the miss and re-practice after a delay.

Canonical chapter practice

The Living World →Biological Classification →Plant Kingdom →Animal Kingdom →Morphology of Flowering Plants →Anatomy of Flowering Plants →Structural Organisation in Animals →Cell: The Unit of Life →Biomolecules →Cell Cycle and Cell Division →Photosynthesis in Higher Plants →Respiration in Plants →Plant Growth and Development →Breathing and Exchange of Gases →Body Fluids and Circulation →Excretory Products and their Elimination →Locomotion and Movement →Neural Control and Coordination →Chemical Coordination and Integration →Sexual Reproduction in Flowering Plants →Human Reproduction →Reproductive Health →Principles of Inheritance and Variation →Molecular Basis of Inheritance →Evolution →Human Health and Disease →Microbes in Human Welfare →Biotechnology: Principles and Processes →Biotechnology and its Applications →Organisms and Populations →Ecosystem →Biodiversity and Conservation →

Frequently asked questions

Are these official NEET 2025 Biology PYQs?

No. The previews are original NeetVellum practice questions. A historical item receives a PYQ label only after its official paper and authoritative final answer key are attached. Use the official archive for the source paper.

How should I use the NEET 2025 paper?

Solve the official paper under its original timing, verify against the final key, classify every miss, and then use the linked current-syllabus practice bank to repair the exposed concept.