Biology Practice Questions For NEET UG 2026 to Score 650+ (Day 40)

Biology Practice Questions For NEET UG 2026 to Score 650+ (Day 40): If you’re aiming for 650+ in NEET UG 2026, Biology isn’t just a subject; it’s your scoring superpower! The secret many toppers follow is simple: NCERT + smart practice questions + daily revision. This specially curated Biology practice set will help you strengthen concepts, improve accuracy, and get exam-ready step by step. Solve sincerely today, and you’ll thank yourself on exam day!

Q.1. Which of the following statements is incorrect? 

(I) Peripheral vascular bundles are generally smaller than the centrally located ones. 

(II) Water-containing cavities are present within the vascular bundles. 

(III) In grasses, certain abaxial epidermal cells along the veins modify themselves into large, empty, colourless cells. 

(IV) The parallel venation in monocot leaves is reflected in the nearly similar sizes of vascular bundles.

A. I

B. II

C. III

D. IV

Q.2. In a typical human nephron, which combination correctly matches the segment with the primary transport event occurring there?

A. Proximal convoluted tubule – active reabsorption of glucose and amino acids

B. Collecting duct (in presence of ADH) – obligatory secretion of ${\text{K}}^{+}$ into lumen

C. Thick ascending limb of loop of Henle – high water permeability with obligatory water reabsorption

D. Descending limb of loop of Henle – active transport of ${\text{Na}}^{+}$ out of filtrate

Q.3. During meiosis I in a human primary oocyte, which of the following events directly ensures that the resulting secondary oocyte receives a haploid, but genetically recombined, set of chromosomes?

A. Separation of sister chromatids during anaphase I

B. Pairing and crossing over between non-sister chromatids in prophase I

C. Formation of the first polar body during telophase I

D. Random orientation of sister chromatids at the metaphase I plate

Q.4. A patient’s ECG shows an absence of P waves but normal QRS complexes and T waves occurring at a regular rate of 40 beats per minute. Which is the most reasonable interpretation?

A. Hyperexcitable SA node; atrial fibrillation causing irregular ventricular rhythm

B. Failure of AV node; ventricles pacing the heart via Purkinje fibres

C. Complete heart block; atria and ventricles beating at independent rates above 100 bpm

D. Failure of SA node; AV node acting as the pacemaker

Q.5. Which statement best explains why DNA replication in eukaryotes is considered both semiconservative and discontinuous?

A. Replication starts from one origin per chromosome, leading to unidirectional fork movement and continuous synthesis

B. RNA primers are not used in eukaryotes, so synthesis occurs only on one strand

C. Each daughter duplex contains one parental and one newly synthesized strand; lagging strand is synthesized in Okazaki fragments

D. Each daughter duplex contains either two parental or two newly synthesized strands; both strands are continuous

Q.6. In human genetic disorders, which of the following best distinguishes Turner’s syndrome from Klinefelter’s syndrome at the chromosomal and phenotypic level?

A. Turner’s: 47, XYY, aggressive male; Klinefelter’s: 46, XY, fertile male with mild symptoms

B. Turner’s: 47, XXY, male with gynecomastia; Klinefelter’s: 45, XO, sterile female

C. Turner’s: 45, XO, short sterile female; Klinefelter’s: 47, XXY, tall sterile male

D. Turner’s: 46, XX, normal female; Klinefelter’s: 47, XXX, super female

Q.7. Which of the following statements are correct about the endodermis?

(I) The root endodermis consists of a single layer of barrel-shaped cells.

(II) The root endodermis has no intercellular spaces.

(III) The tangential as well as radial walls of the root endodermal cells have a deposition of suberin in the form of Casparian strips.

(IV) The cells of the stem endodermis are rich in starch grains.

(V) Next to the root endodermis lies a single layer of cells called the pericycle.

A. I, II, IV

B. I, II, III, IV

C. I, III, V

D. I, III, IV ,V

Q.8. In the sliding filament theory of muscle contraction, which specific event directly triggers the power stroke of the myosin head?

A. Binding of ATP to the myosin head

B. Hydrolysis of ATP to ADP and ${\text{P}}_i$ on the myosin head

C. Release of ${\text{P}}_i$ from the myosin head after strong binding to actin

D. Reuptake of ${\text{Ca}}^{2+}$ into the sarcoplasmic reticulum

Q.9. In a dorsiventral leaf of dicots, which combination correctly matches tissue with its primary functional role in photosynthesis and gas exchange?

A. Spongy parenchyma – maximum light absorption; guard cells – storage of CO${}_2$

B. Palisade parenchyma – major site of gaseous exchange; spongy parenchyma – maximum light absorption

C. Upper epidermis – major site of CO${}_2$ uptake; lower epidermis – maximum light absorption

D. Palisade parenchyma – maximum light absorption; spongy parenchyma – major site of gaseous exchange

Q.10. Apomixis is considered advantageous in plant breeding. Which statement best describes a type of apomixis and its utility?

A. In vegetative propagation, stolons and runners form seeds without fertilization, ensuring hybrid vigour

B. In parthenocarpy, fertilized ovules develop into seeds without endosperm, improving seed viability

C. In diplospory, megaspore mother cell undergoes normal meiosis to form haploid embryo sac leading to genetic recombination

D. In adventive embryony, embryos arise directly from nucellar or integumentary cells, producing maternal clones that fix desirable genotypes

Q.11. Which of the following is true for the vascular bundle in the stem of Bengal gram?

(I) 2-6 vascular bundles are present.

(II) Vascular bundles are almost similar in size.

(III) Conjoint, endarch vascular bundles are present.

(IV) Presence of cambium.

(V) Presence of a ring arrangement.

A. I, II, IV

B. II, IV , V

C. II, III, IV, V

D. II, IV

Q.12. The protein portion of an enzyme is called:

A) Apoenzyme

B) Prosthetic group

C) Cofactor

D) Coenzyme

Q.13. Match List-I with List-II

List – I
A. Adenosine
B. Adenylic acid
C. Adenine
D. Alanine

List – II
I. Nitrogen base
II. Nucleotide
III. Nucleoside
IV. Amino acid

Q.14. Which one of the following statements refers to Reductionist Biology?

A) Chemical approach to study and understand living organisms

B) Behavioral approach to study and understand living organisms

C) Physicochemical approach to study and understand living organisms

D) Physiological approach to study and understand living organisms

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Q.15. Which of the following options gives the correct categorisation of the animals according to the type of respiratory organs?

(I) Adult frog – Tracheal system

(II) Apis – gills

(III) Pila – Gills

(IV) Cutaneous – Hirudinaria

(V) Tracheal system – Aedes

Options:

A. I, II, III

B. III, IV, V

C. I, II, III, IV

D. I, III, IV, V

Answers & Explanations

Ans .1. A. The incorrect statement is (I): Peripheral vascular bundles are generally smaller than the centrally located ones. In monocot leaves (like grasses), vascular bundles are nearly similar in size (except possibly in main veins), reflecting their parallel venation, this directly contradicts statement (IV), which is correct.

Ans. 2. A. Proximal convoluted tubule – active reabsorption of glucose and amino acids. This highlights the major, textbook-described role of PCT as the main site of nutrient and ion recovery, essential for homeostasis and minimizing nutrient loss in urine.

Ans. 3. B. Pairing and crossing over between non-sister chromatids in prophase I. This event re-assorts genetic material between homologous chromosomes and is the primary driver of intrachromosomal recombination, which, along with independent assortment, greatly increases genetic variability.

Ans. 4. D. Failure of SA node; AV node acting as the pacemaker. This accurately explains a slow but regular rhythm with normal QRS complexes and missing P waves.

Ans. 5. C.  Each daughter duplex contains one parental and one newly synthesized strand; the lagging strand is synthesized in Okazaki fragments. This description addresses both key aspects asked in the question.

Ans. 6. C. Turner’s: 45, XO, short sterile female; Klinefelter’s: 47, XXY, tall sterile male. This correctly matches both karyotype and key phenotypic traits.

Ans. 7. B. (I, II, III, IV), Statement V is incorrect because the pericycle lies adjacent to the endodermis, but it’s a single layer only in roots; its presence and layering vary in stems.

Ans. 8. C. Release of ${\text{P}}_i$ from the myosin head after strong binding to actin. This step drives the head to pivot, sliding actin relative to myosin, which shortens the sarcomere.

Ans. 9. D. Palisade parenchyma – maximum light absorption; spongy parenchyma – major site of gaseous exchange. In spongy parenchyma, irregularly shaped cells create large intercellular spaces that allow easy movement of ${\text{CO}}_2$, ${\text{O}}_2$, and water vapour. Stomata, mainly present on the lower epidermis in dorsiventral leaves, open into sub-stomatal cavities that connect to these spaces. Palisade cells, being closely packed and perpendicular to the upper surface, minimize light scattering and maximize absorption, ensuring efficient photosynthesis, while spongy parenchyma optimizes gas diffusion and some photosynthesis.

Ans. 10. D. In adventive embryony, embryos arise directly from nucellar or integumentary cells, producing maternal clones that fix desirable genotypes. Apomictic seed production is advantageous in agriculture because it allows perpetuation of hybrid vigour and desirable traits through seeds without genetic reshuffling, reducing the need for repeated hybridization.

Ans.11. B. (II, IV, V).

Ans.12. A. Apoenzyme.

Ans. 13. A: A-III, B-II, C-I, D-IV

Ans. 14. C, Physico-chemical approach to study and understand living organisms. Reductionism breaks complex systems into simpler parts. In biology, it means explaining life processes in terms of physics and chemistry (molecules, atoms, reactions).“Physico-chemical” explicitly combines physical laws with chemical interactions-the hallmark of a reductionist stance.

Ans.15. B (III, IV, V)

Remember, every question you solve today brings you closer to your dream medical college. Stay consistent, trust your preparation, and keep practicing with us daily for steady improvement. Try these questions, check how many you got right, and share your score in the comments. Your progress motivates us to bring even better practice sets for you! Keep going… 650+ is absolutely achievable!

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