2019 source guide · Biology

NEET 2019 Biology Photosynthesis Questions

Use this page to connect the official 2019 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 2/5

After keeping a variegated plant in darkness and then exposing it to light, Sachs tested its leaf with iodine. Which result supports his conclusion?

A. Every part of the leaf turns blue-black, including non-green areas.
B. Only the non-green regions turn blue-black after receiving light.
C. Only the illuminated green regions turn blue-black because starch accumulates there.
D. Neither green nor non-green regions change colour because starch is consumed in light.

Example 2 · difficulty 2/5

Engelmann illuminated a filamentous alga with light separated into different colours and added aerobic bacteria. Where did most bacteria gather?

A. In the green region, where carbon dioxide absorption was greatest
B. Uniformly along the alga because all wavelengths drove equal oxygen release
C. Only in darkness, where the alga carried out respiration
D. Near regions receiving blue and red light, where oxygen evolution was greatest

Example 3 · difficulty 3/5

Van Niel compared photosynthesis in green plants with that in photosynthetic bacteria using hydrogen donors other than water. Which inference followed from this comparison?

A. The oxygen released by green plants originates from water rather than carbon dioxide.
B. Every photosynthetic organism must release oxygen.
C. Carbon dioxide is the hydrogen donor in green-plant photosynthesis.
D. Water formation, rather than carbon reduction, is the defining event of photosynthesis.

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 2019 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 2019 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.