2018 source guide · Biology

NEET 2018 Biology Photosynthesis Questions

Use this page to connect the official 2018 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 100 verified questions →Check official NTA archive ↗

What to master

pigments, light reactions, carbon fixation, photorespiration and limiting factors.

Original practice preview

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

Example 1 · difficulty 4/5

According to the chemiosmotic hypothesis, a proton gradient builds up across the thylakoid membrane during the light reaction. Which of the following contribute(s) to the accumulation of H+ inside the lumen? (i) Splitting of water, which occurs on the inner side of the thylakoid membrane (ii) Transport of protons from stroma to lumen as electrons pass through the cytochrome b6f complex (iii) Uptake of protons from the stroma during reduction of NADP+ by the stromal-side reductase (iv) Hydrolysis of ATP by the CF0–CF1 particles projecting into the lumen Choose the correct answer:

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

Example 2 · difficulty 1/5

In Priestley’s bell-jar experiments, a mint plant allowed a candle to burn again and a mouse to survive in air that had previously been made unsuitable. What was the central inference from this observation?

A. Green plants can restore a property of air that is lost during burning and animal respiration.
B. Plants purify air only by absorbing water vapour released by animals.
C. A candle supplies plants with the substance needed to release carbon dioxide.
D. Animals and plants both make air unsuitable at exactly the same rate.

Example 3 · difficulty 1/5

Which observation by Ingenhousz added an essential condition to Priestley’s conclusion about plants restoring air?

A. All parts of a plant restore air equally well throughout day and night.
B. Only green parts of plants release oxygen, and they do so in the presence of sunlight.
C. Plant roots release oxygen continuously, whereas leaves release carbon dioxide.
D. Sunlight causes oxygen release from non-green animal tissues as well as leaves.

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

Photosynthesis in Higher Plants →

Frequently asked questions

Are these official NEET 2018 Biology Photosynthesis 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 2018 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.