List of top Questions asked in NEET (UG)- 2026

Find the incorrect statement(s) about photosynthesis from the following:
A. The water splitting complex is associated with PS I.
B. $C_4$ plants use the $C_3$ pathway of $CO_2$ fixation as the main biosynthetic pathway.
C. In $C_4$ plants, photorespiration does not occur.
D. $C_3$ plants exhibit 'Kranz' anatomy.
E. ATP synthesis in chloroplast occurs through chemiosmosis. Choose the answer from the options given below:

Which of the following statements are correct with reference to packaging of DNA helix?
A. Histones are organized to form a unit of eight molecules called histone octamer.
B. Histones are negatively charged basic proteins.
C. Histones are rich in the basic amino acid residues – lysine and arginine.
D. The positively charged DNA is wrapped around the histone octamer to form nucleosome.
E. The packaging of chromatin at higher levels requires an additional set of proteins called non-histone chromosomal proteins. Choose the correct answer from the options given below :

Arrange the following steps of DNA fingerprinting in a correct sequence.
A. Isolation of DNA and its digestion by restriction endonucleases.
B. Hybridisation using labelled VNTR probe.
C. Transferring of separated DNA fragments to synthetic membranes.
D. Detection of hybridised DNA fragments by autoradiography.
E. Separation of DNA fragments by electrophoresis. Choose the correct answer from the options given below:

$2(C_{51}H_{98}O_{6}) + 145\,O_{2} \longrightarrow 102\,CO_{2} + 98\,H_{2}O + \text{energy}$ The Respiratory Quotient (RQ) of a biomolecule used for respiration, as per the above equation, would be :

Which one of the following is the site for active ribosomal RNA synthesis?

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 inorganic substances
D. Humification     IV. Dead remains of plants and animals including fecal matter

Choose the correct answer from the options given below :

Which one of the following statements is not true about the universal rules of binomial nomenclature?

Which of the following statements are correct with reference to a transcription unit in DNA? A. A transcription unit in DNA is defined primarily by three regions: promoter, structural gene and terminator.
B. The promoter is said to be located towards the $5'$-end of the structural gene.
C. The promoter is a DNA sequence that provides binding site for RNA polymerase.
D. The promoter defines the template and coding strands.
E. The terminator is located towards the $3'$-end of the coding strand and it defines the end of the process of transcription.

Match List I with List II regarding the phases of the cell cycle and their activities:

Identify the correct sequence of steps in each cycle of Polymerase Chain Reaction :

The main function of bulliform cells in grasses is :

Alpha-helix is found in which level of protein structure ?

Since the origin and diversification of life on Earth, there have been five episodes of mass extinction of species. How is the sixth extinction, which is in progress, different from the previous episodes ?

Match List I with List II :

List I                       List II
A. Productivity              I. Gross primary productivity minus respiration losses
B. Net primary productivity  II. Rate of formation of new organic matter by consumers
C. Gross primary productivity III. Rate of biomass production
D. Secondary productivity    IV. Rate of production of organic matter during photosynthesis

Choose the correct answer from the options given below :

Exploring molecular, genetic and species-level diversity for products of economic importance is called :

In the {lac} operon, the {z} gene codes for :

In which one of the following, the ovules are not enclosed by an ovary wall and remain exposed ?

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

Given below are the reactions. Identify the reaction for which \(K_p<K_c\):

Given below is an expression for the rate constant of a first order reaction occurring at a certain temperature \(T(K)\): \[ \ln k = 14.34-\frac{1.25\times10^4}{T} \] Given \(R=1.987\text{ cal mol}^{-1}\text{K}^{-1}\). The activation energy of the reaction is:

Phenolphthalein is used as an indicator for titration of sodium hydroxide solution against a standard solution of oxalic acid. The colour change observed at an alkaline pH close to equivalence point of this titration is: