Neet botany question paper
- 1. BIOLOGY CLASS: NEET XI and XII 2019-20 Max Marks: 180 Topic: Botany Duration: 120 Mins INSTRUCTION 1. The test paper contains 45 multiple choice questions Answer all the questions. 2. Each question carries four marks for correct answers and one negative mark for wrong answer. 3. Multiple markings for the same question will be treated as a wrong answer and will carry one negative mark. 4. For each question there are four options of which one option is correct. 5. Rough work can he done on the question paper itself. 6. Calculator / Log table is not allowed. 1. Which one of the following generates new genetic combinations leading to variation? (A ) Sexual reproduction (B) Nucellar polyembryony (C) Vegetative reproduction (D) Parthenogenesis 2. Match column-I with column-II and select the correct option using the codes given below : Column - I Column - II (a) Pistils fused together (i) Gametogenesis (b) Formation of Gametes (ii) Pistillate (c) Hyphae of higher Ascomycetes (iii) Syncarpous (d) Unisexual female flower (iv) Dikaryotic Codes : a b c d (A) i ii iv iii (B) iii i iv ii (C) iv iii i ii (D) ii i iv iii 3. In majority of angiosperms (A) reduction division occurs in the megaspore mother cells (B) a small central cell is present in the embryo sac (C) egg has a filiform apparatus (D) there are numerous antipodal cells 1
- 2. 4. Pollination in water hyacinth and water lily is brought about by the agency of (A) birds (B) bats (C) water (D) insects or wind 5. The ovule of an angiosperm is technically equivalent to (A) megaspore mother cell (B) megaspore (C) megasporangium (D) megasporophyll 6. How many hot spots of biodiversity in the world have been identified till date by Norman Myers? (A) 34 (B) 43 (C) 17 (D) 25 7. The primary producers of the deep-sea hydrothermal vent ecosystem are (A) Blue-green algae (B) Coral reefs (C) Green algae (D) Chemosynthetic bacteria 8. If ‘+’ sign is assigned to beneficial interaction ‘-’ sign to detrimental and ‘0’ sign to neutral interaction, then the population interaction represented by ‘+’ ‘-’ refers to (A) Commensalism (B) Parasitism (C) Mutualism (D) Amensalism 9. Which one of the following is correctly matched? (A) Parthenium hysterophorus - Threat to biodiversity (B) Stratification - Population (C) Aerenchyma - Opuntia (D) Age pyramid - Biome 2
- 3. 10. Red list contains data or information on (A) threatened species (B) marine vertebrates only (C) all economically important plants (D) Plants whose products are in international trade 11. Which one of the following is wrong for fungi? (A) They are heterotrophic (B) They are both unicellular and multicellular (C) They are eukaryotic (D) All fungi possess a purely cellulosic cell wall 12. Methanogens belong to (A) Dinoflagellates (B) Slime moulds (C) Eubacteria (D) Archaebacteria 13. Select the wrong statement (A) Diatoms are chief producers in the oceans (B) Diatoms are microscopic and float passively in water (C) The walls of diatoms are easily destructible (D) Diatomaceous earth’ is formed by the cell walls of diatoms 14. The label of a herbarium sheet does not carry information on (A) Local names (B) Height of the plant (C) Date of collection (D) Name of collector 15. Conifers are adapted to tolerate extreme environmental conditions because of (A) thick cuticle (B) presence of vessels (C) broad hardy leaves (D) superficial stomata 16. Which one of the following statements is wrong? (A) Agar - Agar is obtained from Gelidium and Gracilaria (B) Laminaria and Sargassum are used as food (C) Algae increase the level of dissolved oxygen in the immediate environment (D) Algin is obtained from red algae, and carrageenan from brown algae 3
- 4. 17. The term ‘polyadelphous’ is related to (A) corolla (B) calyx (C) gynoecium (D) androecium 18. How many plants among Indigofera, Sesbania, Salvia, Allium, Aloe, mustard, groundnut, radish, gram and turnip have stamens with different lengths in their flowers? (A) Five (B) Six (C) Three (D) Four 19. Radial symmetry is found in the flowers of (A) Pisum (B) Cassia (C) Brassica (D) Trifolium 20. Free - central placentation is found in (A) Brassica (B) Citrus (C) Dianthus (D) Argemone 21. Cortex is the region found between (A) Endodermis and pith (B) Endodermis and vascular bundle (C) Epidermis and stele (D) Pericycle and endodermis 22. The balloon - shape structures called tyloses (A) Are extensions of xylem parenchyma cells into vessels (B) Are linked to the ascent of sap through xylem vessels (C) Originate in the lumen of vessels (D) Characterize the sapwood 23. Select the mismatch (A) Protists-Eukaryotes (B) Methanogens-Prokaryotes (C) Gas vacuoles-Green bacteria (D) Large central vacuoles-Animal cells 4
- 5. 24. Select the wrong statement (A) Cyanobacteria lack flagellated cells (B) Mycoplasma is a wall-less microorganism (C) Bacterial cell wall is made up of peptidoglycan (D) Pili and fimbriae are mainly involved in motility of bacterial cells 25. A cell organelle containing hydrolytic enzymes is (A) Ribosome (B) Mesosome (C) Lysosome (D) Microsome 26. During cell growth, DNA synthesis takes place in (A) G2 phase (B) M phase (C) S phase (D) G1 phase 27. Which of the following biomolecules is common to respiration-mediated breakdown of fats, carbohydrates and proteins? (A) Pyruvic acid (B) Acetyl CoA (C) Glucose-6- phosphate (D) Fructose 1,6-bisphosphate 28. A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap as tested chemically. Which one of the following test results indicates that it is phloem sap? (A) Low refractive index (B) Absence of sugar (C) Acidic (D) Alkaline 29. You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots? (A) Auxin and abscisic acid (B) Gibberellin and abscisic acid (C) IAA and gibberellin (D) Auxin and cytokinin 5
- 6. 30. Phytochrome is a (A) Lipoprotein (B) Chromoprotein (C) Flavoprotein (D) Glycoprotein 31. Which is essential for the growth of root tip? (A) Ca (B) Mn (C) Zn (D) Fe 32. The process which makes major difference between C3 and C4 plants is (A) Photorespiration (B) Respiration (C) Glycolysis (D) Calvin cycle 33. Which one of the following statements is not correct? (A) In potato, banana and ginger, the plantlets arise from the internodes present in the modified stem (B) Water hyacinth, growing in the standing water, drains oxygen from water that leads to the death of fishes (C) Offspring produced by the asexual reproduction are called clone (D) Microscopic, motile asexual reproductive structures are called zoospores 34. Biochemical Oxygen Demand (BOD) may not be good index for pollution for water bodies receiving effluents from (A) Petroleum industry (B) Sugar industry (C) Domestic sewage (D) Dairy industry 35. The principle of competitive exclusion was stated by (A) MacArthur (B) Verhulst and Pearl (C) C.Darwin (D) G.F.Gause 36. Which of the national parks is the home to the famous musk deer or hangul? (A) Eaglenest Wildlife Sanctuary, Arunachal Pradesh (B) Dachigam National Park, Jammu & Kashmir 6
- 7. (C) Keibul Lamjao National Park, Manipur (D) Bandhavgarh National Park, Madhya Pradesh 37. A lake which is rich in organic waste may result in (A) Increased population of fish due to lots of nutrients (B) Mortality of fish due to lack of oxygen (C) Increased population of aquatic organisms due to minerals (D) Drying of lake due to algal bloom 38. The highest DDT concentration in aquatic food chain shall occur in (A) crab (B) eel (C) phytoplankton (D) seagull 39. Study the four statements (A-D) given below and select the two correct ones out of them (a) Definition of biological species as given by Ernst Mayr (b) Photoperiod does not affect reproduction in plants (c) Binomial nomenclature system was given by R.H.Whittaker (d) In unicellular organisms, reproduction is synonymous with growth (A) A and D (B) A and B (C) B and C (D) C and D 40. Oxidative phosphorylation is (A) Addition of phosphate group to ATP (B) Formation of ATP by energy released from electrons removed during substrate oxidation (C) Formation of ATP by transfer of phosphate group from a substrate to ADP (D) Oxidation of phosphate group in ATP 41. When cell has stalled DNA replication fork, which checkpoint should be predominantly activated? (A) M (B) Both G2/M and M (C) G1/S (D) G2/M 42. Which one of the following statements is correct with reference enzymes? (A) Apoenzyme = Holoenzyme + Coenzyme (B) Holoenzyme = Apoenzyme + Coenzyme (C) Coenzyme = Apoenzyme + Holoenzyme (D) Holoenzyme = Coenzyme + Apoenzyme 7
- 8. 43. Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in (A) C3 plants (B) C4 plants (C) C2 plants (D) C3 and C4 plants 44. Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen? (A) Bacillus (B) Pseudomonas (C) Mycoplasma (D) Nostoc 45. Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by (A) Water (B) Bee (C) Wind (D) Bat 8
- 9. 9