About this EAMCET Medical Biology practice test

EAMCET Medical Botany is worth 40 of 160 marks, and the syllabus runs the full length of the Intermediate Botany textbooks — Plant Kingdom, Cell Biology, Plant Physiology, Reproduction in Flowering Plants, Genetics, Molecular Biology, Biotechnology and Ecology. What trips students up here usually isn't a lack of knowledge but a lack of precision: mixing up incomplete dominance with codominance, or forgetting which scientist's name goes with which discovery. This set is deliberately built around those exact traps, with explanations that spell out the reasoning, not just the answer. Once you're solid here, swap in previous-year EAMCET Botany questions for a chapter-focused final revision pass.

EAMCET Medical Botany Practice Test sample questions

These starter questions help you launch a biology mock test quickly. Swap them with your own worksheet, notebook, or textbook questions any time.

1. 1. Which scientist proposed the Five Kingdom classification system in 1969, using criteria such as cell structure, mode of nutrition, and body organisation?

2. 2. The system of naming organisms using two Latin words, one denoting the genus and the other the species, is called what?

3. 3. Bryophytes are often described as the amphibians of the plant kingdom because of which reproductive requirement?

4. 4. Which type of meristem, located at root and shoot tips, is responsible for increase in the length of a plant?

5. 5. Which xylem element is dead, elongated, tapering at both ends, and lacks perforation plates, functioning mainly in water conduction and mechanical support?

6. 6. Companion cells, which regulate the activity of the adjoining conducting cells, are associated with which phloem element?

7. 7. According to the cell theory as extended by Rudolf Virchow, new cells arise from what?

8. 8. Which double membrane-bound organelle contains its own circular DNA and 70S ribosomes, and is the principal site of aerobic ATP synthesis?

9. 9. The stacked, disc-like membranous structures inside a chloroplast, where the light reactions of photosynthesis occur, are called what?

10. 10. In C4 plants, atmospheric CO2 is first fixed in mesophyll cells by PEP carboxylase to form which four-carbon compound?

11. 11. Glycolysis, the breakdown of glucose into pyruvate, takes place in which part of the cell?

12. 12. The ascent of sap through the xylem of tall trees is best explained by the cohesion-tension (transpiration pull) theory proposed by whom?

13. 13. The fusion of one male gamete with the egg cell to form the zygote, together with the fusion of the second male gamete with the two polar nuclei, is jointly termed what?

14. 14. The typical (Polygonum type) mature embryo sac of angiosperms, at the time of fertilization, consists of how many cells and how many nuclei?

15. 15. The primary endosperm nucleus, formed by triple fusion of one male gamete with two polar nuclei, is genetically what ploidy?

16. 16. Mendel's principle stating that the two alleles of a gene separate from one another during gamete formation, so each gamete receives only one allele, is called what law?

17. 17. In Mirabilis jalapa (the four o'clock plant), a cross between red-flowered and white-flowered plants produces pink-flowered F1 offspring, illustrating which genetic phenomenon?

18. 18. The human ABO blood group system, in which both IA and IB alleles are fully and simultaneously expressed in the AB genotype, demonstrates which genetic phenomenon?

19. 19. The semiconservative mode of DNA replication was experimentally confirmed using E. coli grown in heavy nitrogen (15N) in a classic 1958 experiment conducted by whom?

20. 20. During transcription, which enzyme synthesizes an RNA strand complementary to the DNA template?

21. 21. The short, discontinuously synthesized DNA fragments formed on the lagging strand during replication are known as what?

22. 22. The restriction endonuclease EcoRI, widely used in recombinant DNA technology, was originally isolated from which organism?

23. 23. Bt cotton has been genetically engineered to resist bollworm attack by expressing a cry toxin gene obtained from which bacterium?

24. 24. The thermostable DNA polymerase used to amplify DNA in the polymerase chain reaction (PCR) was isolated from which thermophilic bacterium?

25. 25. The symbiotic nitrogen-fixing bacteria found in the root nodules of leguminous plants such as pea and gram belong to which genus?

26. 26. Penicillin, the first antibiotic discovered by Alexander Fleming, is produced by a mould belonging to which genus?

27. 27. Curd (yogurt) formation from milk through fermentation is primarily brought about by which group of bacteria?

28. 28. An inverted, top-heavy pyramid of biomass, where producer biomass is less than consumer biomass at a given time, is typically observed in which type of ecosystem?

29. 29. The sigmoid (S-shaped) population growth curve, which levels off once the environment's carrying capacity is reached, describes which model of population growth?

30. 30. Depletion of the stratospheric ozone layer is primarily caused by which group of industrial chemicals?

Answer key & quick explanations

Short answers for the sample questions above. Use this to self-check before generating a fresh AI-built mock test.

1. 1. Which scientist proposed the Five Kingdom classification system in 1969, using criteria such as cell structure, mode of nutrition, and body organisation?

   R.H. Whittaker

   Whittaker's 1969 scheme grouped organisms into Monera, Protista, Fungi, Plantae, and Animalia. It replaced the older two-kingdom system by using cell structure, thallus organisation, mode of nutrition, and phylogenetic relationships rather than just plant versus animal traits.

2. 2. The system of naming organisms using two Latin words, one denoting the genus and the other the species, is called what?

   Binomial nomenclature

   Carl Linnaeus formalised this two-word naming convention, where the first word is the genus (capitalised) and the second is the specific epithet. It gives every organism a stable, universally recognised scientific name, italicised or underlined by convention.

3. 3. Bryophytes are often described as the amphibians of the plant kingdom because of which reproductive requirement?

   They need external water for fertilization

   Bryophytes such as mosses and liverworts grow on land but their flagellated, motile male gametes must swim through a film of water to reach the egg. This dependence on external moisture for sexual reproduction mirrors the dual land-water life cycle of amphibians.

4. 4. Which type of meristem, located at root and shoot tips, is responsible for increase in the length of a plant?

   Apical meristem

   Apical meristems occur at the tips of roots and shoots and continuously divide to add new cells, producing primary growth in length. This contrasts with lateral meristems like the vascular cambium, which instead increase girth.

5. 5. Which xylem element is dead, elongated, tapering at both ends, and lacks perforation plates, functioning mainly in water conduction and mechanical support?

   Tracheid

   Tracheids are elongated, dead cells with lignified walls and tapering ends, connected end to end through pits rather than open perforations. Unlike vessel elements, they have no perforation plates, so water movement between them is slower and they also lend mechanical strength.

6. 6. Companion cells, which regulate the activity of the adjoining conducting cells, are associated with which phloem element?

   Sieve tube elements

   Companion cells are specialised parenchyma cells that develop alongside sieve tube elements from the same mother cell and remain connected to them by pit fields. They supply the enucleate sieve tubes with proteins and energy needed for active loading and transport of photosynthates.

7. 7. According to the cell theory as extended by Rudolf Virchow, new cells arise from what?

   Pre-existing cells (Omnis cellula e cellula)

   Schleiden and Schwann proposed that all living organisms are composed of cells, but it was Virchow in 1855 who added that cells arise only through division of previously existing cells. This addition ruled out spontaneous generation of cells and completed the modern cell theory.

8. 8. Which double membrane-bound organelle contains its own circular DNA and 70S ribosomes, and is the principal site of aerobic ATP synthesis?

   Mitochondrion

   The mitochondrion has a smooth outer membrane and a highly folded inner membrane forming cristae, which house the electron transport chain and ATP synthase. Its own circular DNA and 70S ribosomes support the endosymbiotic theory of its bacterial origin.

9. 9. The stacked, disc-like membranous structures inside a chloroplast, where the light reactions of photosynthesis occur, are called what?

   Grana (composed of thylakoids)

   Each granum is a stack of flattened, membrane-bound thylakoid discs suspended in the chloroplast's stroma and interconnected by stroma lamellae. Photosystems I and II embedded in these thylakoid membranes carry out the light-dependent reactions, including water splitting and NADPH/ATP generation.

10. 10. In C4 plants, atmospheric CO2 is first fixed in mesophyll cells by PEP carboxylase to form which four-carbon compound?

    Oxaloacetic acid (OAA)

    PEP carboxylase has a very high affinity for CO2 and combines it with phosphoenolpyruvate in mesophyll cells to yield oxaloacetic acid. OAA is then converted to malate or aspartate and shuttled to bundle sheath cells, where CO2 is released for the Calvin cycle.

11. 11. Glycolysis, the breakdown of glucose into pyruvate, takes place in which part of the cell?

    Cytoplasm (cytosol)

    Glycolysis is a sequence of ten enzyme-catalysed reactions occurring entirely in the cytosol, independent of oxygen or mitochondria. It converts one molecule of glucose into two molecules of pyruvate, yielding a small net gain of ATP and NADH.

12. 12. The ascent of sap through the xylem of tall trees is best explained by the cohesion-tension (transpiration pull) theory proposed by whom?

    Dixon and Jolly

    According to this theory, transpiration from leaf surfaces creates a negative pressure (tension) that pulls water upward through continuous, cohesive water columns in the xylem. Strong cohesive forces between water molecules and adhesion to xylem walls prevent the columns from breaking under this tension.

13. 13. The fusion of one male gamete with the egg cell to form the zygote, together with the fusion of the second male gamete with the two polar nuclei, is jointly termed what?

    Double fertilization

    This process, unique to flowering plants, was first described by Nawaschin. One male gamete fuses with the egg cell to produce a diploid zygote, while the other fuses with the two polar nuclei to form the triploid primary endosperm nucleus, a phenomenon exclusive to angiosperms.

14. 14. The typical (Polygonum type) mature embryo sac of angiosperms, at the time of fertilization, consists of how many cells and how many nuclei?

    7 cells and 8 nuclei

    The mature embryo sac contains an egg apparatus of three cells (one egg cell and two synergids) at the micropylar end, three antipodal cells at the chalazal end, and one large central cell holding two polar nuclei. Since the central cell has two nuclei but is counted as one cell, the total works out to seven cells but eight nuclei.

15. 15. The primary endosperm nucleus, formed by triple fusion of one male gamete with two polar nuclei, is genetically what ploidy?

    Triploid (3n)

    Triple fusion combines one haploid male gamete with the two haploid polar nuclei of the central cell, producing a triploid primary endosperm nucleus. This nucleus subsequently divides repeatedly to form the nutritive endosperm tissue that nourishes the developing embryo.

16. 16. Mendel's principle stating that the two alleles of a gene separate from one another during gamete formation, so each gamete receives only one allele, is called what law?

    Law of Segregation

    During meiosis, the paired alleles on homologous chromosomes separate so that each gamete carries only one allele for every gene. Mendel deduced this from his monohybrid crosses, where recessive traits masked in the F1 generation reappeared in a 3:1 ratio in the F2 generation.

17. 17. In Mirabilis jalapa (the four o'clock plant), a cross between red-flowered and white-flowered plants produces pink-flowered F1 offspring, illustrating which genetic phenomenon?

    Incomplete dominance

    Neither the red nor the white allele is fully dominant here, so the heterozygote shows an intermediate pink phenotype rather than resembling either parent. Selfing the pink F1 plants regenerates red, pink, and white offspring in a 1:2:1 ratio, matching the underlying genotypic ratio exactly.

18. 18. The human ABO blood group system, in which both IA and IB alleles are fully and simultaneously expressed in the AB genotype, demonstrates which genetic phenomenon?

    Codominance

    Unlike incomplete dominance, codominance produces a phenotype in which both alleles are independently and completely expressed rather than blended. In blood group AB, red blood cells display both A and B surface antigens simultaneously, confirming that neither IA nor IB masks the other.

19. 19. The semiconservative mode of DNA replication was experimentally confirmed using E. coli grown in heavy nitrogen (15N) in a classic 1958 experiment conducted by whom?

    Meselson and Stahl

    They grew E. coli in a medium with heavy nitrogen (15N) and then shifted the bacteria to normal 14N medium, tracking DNA density through successive generations using density-gradient centrifugation. The intermediate and light density bands obtained matched the semiconservative model exactly, ruling out conservative and dispersive alternatives.

20. 20. During transcription, which enzyme synthesizes an RNA strand complementary to the DNA template?

    RNA polymerase

    RNA polymerase binds to the promoter region of a gene and moves along the template strand, adding ribonucleotides complementary to the DNA in the 5' to 3' direction. In eukaryotes, distinct RNA polymerases (I, II, III) transcribe different classes of RNA, while bacteria rely on a single RNA polymerase for all transcription.

21. 21. The short, discontinuously synthesized DNA fragments formed on the lagging strand during replication are known as what?

    Okazaki fragments

    Because DNA polymerase can only synthesize in the 5' to 3' direction, the lagging strand is copied in short, discontinuous stretches moving away from the replication fork. These fragments are later joined into a continuous strand by the enzyme DNA ligase.

22. 22. The restriction endonuclease EcoRI, widely used in recombinant DNA technology, was originally isolated from which organism?

    Escherichia coli

    EcoRI recognises the specific palindromic sequence GAATTC and cleaves the DNA backbone at a defined point within it, generating sticky ends useful for cloning. Bacteria naturally use such restriction enzymes as a defence system to cut and destroy invading viral DNA.

23. 23. Bt cotton has been genetically engineered to resist bollworm attack by expressing a cry toxin gene obtained from which bacterium?

    Bacillus thuringiensis

    Genes such as cryIAc and cryIIAb, isolated from this soil bacterium, encode crystal proteins that are toxic specifically to lepidopteran insect larvae like the bollworm. When ingested by the pest, the toxin binds to gut receptors and causes cell lysis, protecting the transgenic cotton plant without harming other organisms.

24. 24. The thermostable DNA polymerase used to amplify DNA in the polymerase chain reaction (PCR) was isolated from which thermophilic bacterium?

    Thermus aquaticus

    This enzyme, commercially known as Taq polymerase, remains active even after repeated exposure to the high denaturation temperatures (around 95 degrees Celsius) used in each PCR cycle. Its heat stability eliminated the need to add fresh polymerase after every cycle, making automated DNA amplification practical.

25. 25. The symbiotic nitrogen-fixing bacteria found in the root nodules of leguminous plants such as pea and gram belong to which genus?

    Rhizobium

    Rhizobium bacteria infect legume root hairs and induce the formation of nodules, where they convert atmospheric nitrogen into ammonia using the enzyme nitrogenase. In return for this fixed nitrogen, the host plant supplies the bacteria with carbohydrates, making this a mutually beneficial symbiosis.

26. 26. Penicillin, the first antibiotic discovered by Alexander Fleming, is produced by a mould belonging to which genus?

    Penicillium

    Fleming noticed in 1928 that a contaminating Penicillium mould had inhibited bacterial growth on his culture plate, leading to the discovery of penicillin. This antibiotic works by interfering with bacterial cell wall synthesis, making it effective against many Gram-positive bacteria.

27. 27. Curd (yogurt) formation from milk through fermentation is primarily brought about by which group of bacteria?

    Lactic acid bacteria

    Bacteria such as Lactobacillus convert lactose in milk into lactic acid, which lowers the pH and causes milk proteins to coagulate into curd. These bacteria also multiply in the gut after consumption and improve digestion by keeping harmful microbes in check.

28. 28. An inverted, top-heavy pyramid of biomass, where producer biomass is less than consumer biomass at a given time, is typically observed in which type of ecosystem?

    Pond (aquatic) ecosystem

    In a pond, the standing crop of phytoplankton producers is small at any instant because they are rapidly consumed and have a very short life cycle, while the biomass of fish and other consumers accumulates over time. This makes the pyramid of biomass inverted, even though the pyramid of energy for the same ecosystem remains upright.

29. 29. The sigmoid (S-shaped) population growth curve, which levels off once the environment's carrying capacity is reached, describes which model of population growth?

    Logistic growth model

    In this model, population growth slows as resources become limiting, and the population size eventually stabilises at the carrying capacity (K) of the habitat. This realistic pattern contrasts with the unchecked exponential (J-shaped) growth that occurs only when resources are unlimited.

30. 30. Depletion of the stratospheric ozone layer is primarily caused by which group of industrial chemicals?

    Chlorofluorocarbons (CFCs)

    CFCs, once widely used in refrigerants, aerosol propellants, and foam-blowing agents, release chlorine atoms in the stratosphere under UV radiation. Each chlorine atom catalytically breaks down many ozone molecules, thinning the ozone layer and increasing harmful UV-B radiation reaching Earth's surface.

Curriculum Mapping & Learning Guide

Use this breakdown to identify which skills each question tests and guide post-test review.

EAMCET Medical Biology units covered

1. Chapter 1: Diversity in the Living World
2. Chapter 2: Structural Organisation in Plants
3. Chapter 3: Cell – Structure and Functions
4. Chapter 4: Plant Physiology (Photosynthesis, Respiration, Transport)
5. Chapter 5: Reproduction in Flowering Plants
6. Chapter 6: Genetics
7. Chapter 7: Molecular Basis of Inheritance
8. Chapter 8: Biotechnology and Its Applications
9. Chapter 9: Plants, Microbes and Human Welfare
10. Chapter 10: Ecology and Environment

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