2020 source guide · Biology

NEET 2020 Biology Photosynthesis Questions

Use this page to connect the official 2020 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

Which statement correctly distinguishes Ingenhousz’s contribution from Priestley’s earlier work?

A. Ingenhousz discovered starch formation, whereas Priestley discovered chlorophyll.
B. Ingenhousz identified sunlight and green plant parts as necessary for oxygen evolution, whereas Priestley showed that plants could restore altered air.
C. Ingenhousz traced oxygen to water, whereas Priestley separated sunlight into a spectrum.
D. Ingenhousz located carbon fixation in the stroma, whereas Priestley located pigments in thylakoids.

Example 2 · difficulty 2/5

Why is a plant usually kept in darkness before a Sachs-type experiment on starch formation?

A. To remove chlorophyll from the leaves
B. To stop the leaf from taking up carbon dioxide permanently
C. To use up previously stored starch so that newly formed starch can be attributed to the experimental light treatment
D. To fill the chloroplasts with oxygen before illumination

Example 3 · difficulty 3/5

In Engelmann’s experiment, why were aerobic bacteria suitable biological indicators for constructing an action spectrum?

A. They emitted different colours at different wavelengths.
B. They supplied carbon dioxide only to portions receiving green light.
C. They converted all incident wavelengths into red light for the alga.
D. They moved toward regions with greater oxygen concentration, revealing wavelengths that drove photosynthesis most effectively.

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 2020 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 2020 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.