2021 source guide · Biology

NEET 2021 Biology Ecology Questions

Use this page to connect the official 2021 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 318 verified questions →Check official NTA archive ↗

What to master

populations, communities, ecosystems, biodiversity and conservation.

Original practice preview

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

Example 1 · difficulty 4/5

Robert Constanza and his colleagues attempted to put a price tag on nature's life-support services. According to their estimate, the average annual value of fundamental ecosystem services is about:

A. US$ 18 trillion
B. US$ 25 trillion
C. US$ 50 trillion
D. US$ 33 trillion

Example 2 · difficulty 1/5

A wildlife biologist records that in a tiger reserve, 40 cubs were born during a year in a population of 800 tigers. The population attribute she has measured, when standardised, is called:

A. Sex ratio
B. Age pyramid
C. Birth rate
D. Population density

Example 3 · difficulty 2/5

An insect pest reaches a greenhouse with unlimited food and space. Its initial population is 1000 and its intrinsic rate of natural increase (r) is 0.1 per individual per year. Assuming exponential growth, what will the population size be after 10 years? (Take e = 2.72)

A. About 2720
B. About 1720
C. About 3720
D. About 10000

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

Organisms and Populations →Ecosystem →Biodiversity and Conservation →

Frequently asked questions

Are these official NEET 2021 Biology Ecology 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 2021 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.