2018 source guide · Biology

NEET 2018 Biology Plant Physiology 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 300 verified questions →Check official NTA archive ↗

What to master

photosynthesis, respiration, growth and hormonal control.

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 2/5

In a longitudinal section of a root tip, the cells lying just behind the actively dividing zone are observed to have greatly enlarged vacuoles and fresh cell wall material being deposited, yet they continue to increase in size. To which phase of growth do these cells belong?

A. Meristematic phase
B. Phase of elongation
C. Phase of maturation
D. Quiescent centre

Example 3 · difficulty 3/5

A seedling weighing 5 g (dry mass) grows exponentially according to Wt = W₀ · e^(rt), where the relative growth rate r = 0.07 per day. Taking ln 2 ≈ 0.69, approximately how many days will it take to reach 20 g?

A. About 10 days
B. About 14 days
C. About 20 days
D. About 28 days

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 →Respiration in Plants →Plant Growth and Development →

Frequently asked questions

Are these official NEET 2018 Biology Plant Physiology 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.