Year-wise Biology practice

NEET 2026 Biology PYQs

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90 questions in this collection · Page 2 of 9

Question 11 of 90

🟢 NEET 2026 📘 CLASS XII

Molecular Basis Of Inheritance

In the lac operon, the z gene codes for:

The lacZ gene encodes β-galactosidase, which hydrolyses lactose into glucose and galactose.

Question 12 of 90

🟢 NEET 2026 📘 CLASS XI

Cell Cycle And Cell Division

Match List-I with List-II:

List-I (Phase of Cell Cycle)	List-II (Activity)
A. G₁ phase	I. Actual cell division occurs
B. S phase	II. Cell is metabolically active and continuously grows but does not replicate its DNA
C. G₂ phase	III. Synthesis of DNA occurs and the amount of DNA per cell doubles
D. M phase	IV. Proteins are synthesized while cell growth continues

G₁ is the growth phase, S is the DNA synthesis phase, G₂ involves protein synthesis and preparation for mitosis, and M phase is the phase of actual cell division.

Question 13 of 90

🟢 NEET 2026 📘 CLASS XI

Respiration In Plants

2(C₅₁H₉₈O₆) + 145O₂ → 102CO₂ + 98H₂O + energy

The Respiratory Quotient (RQ) of a biomolecule used for respiration, as per the above equation, would be:

RQ = CO₂ produced / O₂ consumed = 102/145 ≈ 0.70, which is characteristic of fats.

Question 14 of 90

🟢 NEET 2026 📘 CLASS XII

Plant Growth And Development

Which one of the following is not a characteristic of plant cells in the phase of elongation?

Cells in the elongation zone enlarge rapidly and become highly vacuolated. Large conspicuous nuclei are characteristic of meristematic cells.

Question 15 of 90

🟢 NEET 2026 📘 CLASS XII

Biotechnology And Its Applications

Arrange the following steps of somatic hybridisation in the correct sequence:

(A) Digestion of cell walls
(B) Isolation of naked protoplasts
(C) Fusion of protoplasts to get hybrid protoplast
(D) Isolation of single cells from two different varieties of plants
(E) Growing of hybrid protoplast to form a new plant

Single cells are isolated first, cell walls are digested to obtain protoplasts, protoplasts are fused, and the hybrid protoplast is cultured to regenerate a new plant.

Question 16 of 90

🟢 NEET 2026 📘 CLASS XI

Anatomy Of Flowering Plants

Match List-I with List-II:

List-I	List-II
A. Conjunctive tissue	I. Specialised cells in the vicinity of guard cells
B. Casparian strips	II. Endodermal cells rich in starch
C. Subsidiary cells	III. Tissue between xylem and phloem
D. Starch sheath	IV. Endodermal cells with suberin deposition

Conjunctive tissue lies between xylem and phloem. Casparian strips are suberin deposits in endodermis. Subsidiary cells surround guard cells. Starch sheath refers to starch-rich endodermis.

Question 17 of 90

🟢 NEET 2026 📘 CLASS XI

Morphology Of Flowering Plants

In angiosperms, root hairs arise from which one of the following regions of the root?

Root hairs are unicellular extensions of epidermal cells formed in the region of maturation.

Question 18 of 90

🟢 NEET 2026 📘 CLASS XII

Sexual Reproduction In Flowering Plants

Which one of the following is a triploid cell?

The primary endosperm cell is triploid (3n), formed after triple fusion during double fertilization.

Question 19 of 90

🟢 NEET 2026 📘 CLASS XII

Ecosystem

Match List-I with List-II:

List-I	List-II
A. Decomposition	I. Accumulation of dark coloured amorphous colloidal substance
B. Detritus	II. Release of inorganic nutrients by the activity of microbes in soil
C. Mineralisation	III. Breaking down of complex organic matter into simpler substances
D. Humification	IV. Dead remains of plants and animals including faecal matter

Decomposition breaks down detritus. Detritus consists of dead organic matter. Mineralisation releases inorganic nutrients. Humification forms dark-coloured humus.

Question 20 of 90

🟢 NEET 2026 📘 CLASS XI

Biological Classification

The main criteria used for Five Kingdom Classification proposed by R.H. Whittaker (1969) included:

(A) Cell structure
(B) Body organization
(C) Presence of flagellum
(D) Reproduction
(E) Phylogenetic relationships

Choose the correct answer from the options given below:

Whittaker's five-kingdom classification was based on cell structure, body organisation, mode of nutrition, reproduction and phylogenetic relationships. Presence of flagellum was not a criterion.

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