50+ NEET 2026 questions matched questions already published on PrepPage. Tap any predicted card to open it on the live platform.
What is the total number of ATP and NADPH molecules required to synthesize one molecule of glucose through the Calvin pathway?
18 ATP and 12 NADPH
12 ATP and 18 NADPH
6 ATP and 6 NADPH
3 ATP and 2 NADPH
Which of the following cry genes encodes a protein that controls cotton bollworms?
cryIAb
cryIAc and cryIIAb
cryIAb and cryIIAb
cryIAb and cryIAc
The characteristic large holes in Swiss cheese are a result of the production of a large amount of by which bacterium?
Lactobacillus
Saccharomyces cerevisiae
Propionibacterium sharmanii
Aspergillus niger
Which type of pollination introduces genetic variation to the offspring?
Autogamy
Geitonogamy
Xenogamy
Cleistogamy
Compared to the pre-human era, the current rate of species extinction is estimated to be:
10 to 100 times slower
100 to 1,000 times faster
Approximately the same
10 to 100 times faster
What is the ploidy of the primary endosperm nucleus (PEN) in flowering plants?
Haploid
Diploid
Triploid
Tetraploid
Which of the following is the correct sequence of steps in a PCR cycle?
Primer annealing → Denaturation → Extension of primers.
Denaturation → Primer annealing → Extension of primers.
Extension of primers → Primer annealing → Denaturation.
Denaturation → Primer annealing → Synthesis.
In grasses, what is the primary role of bulliform cells when they become flaccid due to water stress?
They cause the leaf surface to be exposed to maximise water absorption.
They aid in the rapid transport of water to the vascular bundles.
They make the leaves curl inwards to minimise water loss.
They provide extra support to the leaf midrib during dry conditions.
Which of the following statements regarding the universal rules of biological nomenclature is INCORRECT?
Biological names are generally in Latin and written in italics.
When handwritten, both words in a biological name are separately underlined.
The second component of a biological name represents the genus.
Scientific names ensure that each organism has only one name globally.
The nucleolus, a dense spherical structure within the nucleoplasm, is the primary site for which of the following processes?
Protein synthesis
Active ribosomal RNA synthesis
DNA replication
Formation of spindle fibres
The equation for the respiration of tripalmitin is . Based on this equation, the RQ is less than 1 because:
The number of molecules of evolved is greater than the number of molecules of consumed.
Two molecules of tripalmitin are used in the reaction.
The number of molecules of consumed is greater than the number of molecules of evolved.
The production of water molecules alters the gas pressure.
Assertion (A): Heterophylly is an example of plasticity in plant development. Reason (R): Plasticity allows plants to exhibit different leaf shapes based on environmental conditions or phases of life.
Both A and R are true and R is the correct explanation
Both A and R are true but R is NOT the correct explanation
A is true but R is false
A is false but R is true
A key characteristic of gymnosperms is that their ovules are:
Enclosed within a fruit
Double fertilized
Protected by a carpel
Not enclosed by an ovary wall
The defect in sickle-cell anemia is caused by:
Substitution of Glutamic acid.
Substitution of Alanine.
Substitution of Aspartic acid.
Substitution of Serine.
Given the following values: Residual Volume (RV) = 1200 mL, Expiratory Reserve Volume (ERV) = 1100 mL, Tidal Volume (TV) = 500 mL, and Inspiratory Reserve Volume (IRV) = 2500 mL, what is the Total Lung Capacity (TLC)?
4100 mL
3600 mL
4800 mL
5300 mL
The mutation in the beta-globin gene that causes sickle cell anemia is a single base substitution. Which of the following represents that substitution?
GAG → GCG
GAG → GUG
GAG → GGG
GAG → GAG
Match the proteins listed in Column I with their functions in Column II and select the correct option.
| Column I | Column II | |---------------|-------------------------------| | (i) Collagen | (a) Glucose transport | | (ii) Trypsin | (b) Intercellular ground substance | | (iii) Antibody| (c) Enzyme | | (iv) GLUT-4 | (d) Fights infectious agents |
(i)-(b), (ii)-(d), (iii)-(c), (iv)-(a)
(i)-(c), (ii)-(a), (iii)-(d), (iv)-(b)
(i)-(d), (ii)-(c), (iii)-(b), (iv)-(a)
(i)-(b), (ii)-(c), (iii)-(d), (iv)-(a)
Assertion (A): In racemose type of inflorescences, the main axis continues to grow. Reason (R): Flowers in racemose inflorescence are borne laterally in a basipetal succession.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is NOT the correct explanation of A.
A is true but R is false.
A is false but R is true.
Which of the following is NOT an example of 'in situ' conservation?
National parks
Wildlife sanctuaries
Biosphere reserves
Zoological parks
Gamete Intra Fallopian Transfer (GIFT) is a technique where:
A zygote is transferred into the fallopian tube.
An embryo is transferred into the uterus.
An ovum collected from a donor is transferred into the fallopian tube of another female
A sperm is directly injected into the ovum.
The enzyme responsible for the carboxylation of RuBP is more accurately called RuBisCO because it also possesses an oxygenation activity. This 'oxygenation activity' refers to the enzyme's ability to:
Use oxygen as a cofactor for fixing
Release a molecule of oxygen during carboxylation
Catalyse the binding of to RuBP
Function as an oxygenase only in the absence of
Which of the following pairs represents homologous structures?
Thorns of Bougainvillea and tendrils of Cucurbita
Wings of a butterfly and wings of a bird
Eye of an octopus and eye of a mammal
Potato (stem modification) and sweet potato (root modification)
The Mediterranean orchid Ophrys utilizes 'sexual deceit' to attract a species of bee for pollination. Which of the following statements accurately describes this mechanism?
The orchid flower emits a scent that attracts female bees, which then pollinate the flower while collecting nectar.
The orchid flower traps bees and releases them only after they have successfully pollinated the flower.
The orchid flower offers a highly nutritious reward to bees, ensuring their return visits for pollination.
The orchid flower mimics the appearance of a female bee, leading the male bee to attempt to 'pseudocopulate' and, in the process, collect and transfer pollen.
DNA fragments separated by gel electrophoresis are visualized by:
Staining with ethidium bromide and exposure to UV radiation
Exposure to X-rays
Direct observation under visible light
Staining with Coomassie blue and exposure to visible light
Which of the following was NOT a criterion used by R.H. Whittaker for his Five Kingdom Classification?
Cell structure
Mode of nutrition
Phylogenetic relationships
Habitat
Which of the following represents the correct sequence of events leading to pollen grain formation?
Dissociation of microspores → Microspore tetrad formation → Pollen grain development
Microspore tetrad formation → Dissociation of microspores → Pollen grain development
Dissociation of microspores → Pollen grain development → Microspore tetrad formation
Microspore mother cell development → Pollen grain development → Microspore tetrad formation
The defect in sickle-cell anemia is caused by:
Substitution of Glutamic acid.
Substitution of Alanine.
Substitution of Aspartic acid.
Substitution of Serine.
Which of the following is a characteristic feature of members belonging to Class Cyclostomata?
Presence of jaws and paired fins.
Absence of scales and presence of cartilaginous endoskeleton.
Respiration through a single pair of gill slits.
Marine habitat throughout their life cycle.
Which of the following is NOT explicitly listed as a step involved in respiration, according to the text?
Filtration of air in the trachea
Diffusion of gases across alveolar membrane
Transport of gases by the blood
Utilisation of by the cells
In the Verhulst-Pearl Logistic Growth equation, , what happens to the population growth rate () as the population size () approaches the carrying capacity ()?
increases exponentially.
remains constant.
approaches zero.
approaches infinity.
The pyramid of biomass in the sea is generally:
Upright, as producers always have higher biomass.
Upright, similar to the pyramid of energy.
Roughly equal, with similar biomass at each level.
Inverted, because the biomass of fishes far exceeds that of phytoplankton.
Which of the following human diseases has been treated using a biological product obtained from transgenic animals?
Emphysema
Phenylketonuria (PKU)
Cystic fibrosis
Alzheimer's disease
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