Science-Class-11 Biology DPP Talent Search Examinations

Biology-XI 1. Viroids discovered by Diener (1971) are infectious agents and cause diseases in plants only. They differ from viruses in being (1) Naked DNA molecules without protein coat (2) Naked RNA molecule of 250-400 nucleotides without protein coat (3) Naked DNA packaged with viral genome (4) Satellite DNA packaged with viral genome 2. What enables the archaebacteria to tolerate extremes of heat and pH ? (1) The occurrence of polysaccharides and proteins in the cell wall (2) The occurrence of branched chain lipids in the cell membranes (3) The occurrence of mucopeptides in the cell wall (4) The occurrence of mucocomplex in the cell wall. 3. Which one of the following is not correctly matched? (1) Viruses – Interferon (2) Penicillium – Griseofulvin (3) Aspergillus – Aflatoxins (4) Bacteria – Phytoalexins 4. Which statement is correct about fungi ? (1) There is a progressive elaboration of sporophyte from lower to higher fungi (2) There is a progressive complexity in sexuality from lower to higher fungi (3) There is a progressive reduction of sexuality from lower to higher fungi (4) Sex organs are absent in lower fungi 5. The gametes in Spirogyra (lateral conjugation) are (1) Morphologically and physiologically similar (2) Morphologically dissimilar but physiologically similar (3) Morphologically as well as physiologically dissimilar (4) Morphologically similar but physiologically dissimilar 6. Which one of the following is a wrong statement? (1) Cephaleuros and Harveyella have the same mode of nutrition (2) Chlamydomonas and Ulothrix are believed to show origin of sex (3) Riccia and Marchantia belong to liverworts (4) Kelps belong to rhodophyta - : Rough Space : - [2] Biology-XI 7. Independent sporophytic and gametophytic generations are present in (1) Bryophytes (2) Pteridophytes (3) Angiosperms (4) Gymnosperms 8. The neck canal cell of fern archegonium is (1) One celled and uninucleate (2) One celled and binucleate (3) Two celled, each uninucleate (4) Two celled, each binucleate 9. Banana plants multiply by means of (1) Stolon (2) Rhizome (3) Sucker (4) Seed 10. Which one of the following is wrongly matched? (1) Hypanthodium – Syconus (2) Sunflower – Cypsella (3) Umbel – Cremocarp (4) Catkin – Sorosis 11. Which of the following is an incorrect statement? (1) Orobanche is a total root parasite (2) Bryophyllum bears foliar buds (3) Santalum album is a total stem parasite (4) Arceuthobium is the smallest parasitic angiosperm 12. Which one of the following is correctly matched? (1) Verticillaster – Cincinnus (2) Cyathium – Hermaphrodite flowers (3) Acropetal – Centrifugal (4) Cymose – Indefinite growth 13. The 3 sub-families of Leguminosae are distinguished mainly on the basis of 14. 14. 15. 15. 16. 16. - : Rough Space : - [3] Biology-XI 17. Tyloses are (1) Deposits of tannin in the sapwood (2) Deposits of resin in the heartwood (3) Infoldings of xylem parenchyma in xylem elements (4) Balloon like deposits in the heartwood 18. Multiple epidermis occurs in the leaves of (1) Cotton (2) Oleander (3) Sunflower (4) Grasses 19. Medullary rays in dicot roots are (1) Uniseriate (2) Biseriate (3) Multiseriate (4) Absent 20. Abnormal secondary growth occurs in (1) Dracaena (2) Boerhaavia (3) Mirabilis (4) All of these 21. Which one of the following statement is correct? (1) Knots are formed in old dicot stems due to the activity of vascular cambium (2) Secondary growth generally does not occur in monocot stems (3) Epidermal hairs may be unicellular or multicellular (4) All of these 22. Consider the following statements (i) Roots are always positively geotropic (ii) Branches of stem are never endogenous (iii) Buds are epiphyllous in Bryophyllum (iv) Branches of roots are always exogenous Mark the correct answer (1) (i) and (ii) (2) (i), (ii) and (iii) (3) (ii) and (iii) (4) (ii), (iii) and (iv) 23. In ascending imbricate aestivation of corolla which of the petals is internal (1) Anterior (2) Lateral (3) Posterior (4) None of these 24. Epicalyx is (i) One or more whorl of bracteoles found at the base of calyx (ii) Epicalyx is found in most of the members of Malvaceae (iii) It is the whorl of bracts present at the base of flower (iv) It is whorl of bracts present at the base of an inflorescence (1) Statement (i) is correct (2) Statements (i) & (ii) are correct (3) Statements (i) & (iii) are correct (4) Statements (ii) & (iv) are correct - : Rough Space : - [4] Biology XII 25. In didynamous condition of stamens (1) Two outer stamens are long & two inner are short (2) Two outer are short & two inner are long (3) The stamens are of same length but arranged in two groups (4) None of these 26. Leutinizing hormone is secreted by (1) Leuteal cells (2) Gonadotrophs (3) Lactotrophs (4) Somatotrophs 27. Dyad is pair of (1) Non sister chromatids (2) Homologous chromosomes (3) Sister chromatids (4) Sex chromosomes 28. What is the role of acetylcholine in muscle contraction (1) It is used to link a nerve pulse with receptors in the muscle (2) It makes upper part of the muscle fibres (3) The myosin heads use acetylcholine to bind to actin filaments (4) It maintains contraction of a muscle in manner similar to a brake 29. Pick up the correct match a. Cow i. Perisodactyla b. Horse ii. Proboscidia c. Whale iii. Artiodactyla d. Elephant iv. Cetacea (1) iii, i, iv, ii (2) iii, i, ii, iv (3) i, iii, iv, ii (4) i, iii, ii, iv 30. Observe the diagram below and mark A, B, C (B) IVC RA RV LA L V (C) Heart (A) Intestine - : Rough Space : - [5] Biology-XI (l) A-Hepatic artery, B-Hepatic Portal vein, C-Hepatic vein (2) A-Hepatic Portal vein, B-Hepatic vein, C-Hepatic artery (3) A-Hepatic vein, B-Hepatic artery, C-Hepatic Portal vein (4) A-Hepatic Portal vein, B-Hepatic artery, C-Hepatic vein 31. Frogs heart consists of (1) Sinus venosus, single auricle and ventricle (2) Two auricles and two ventricles (3) Truncus arteriosus, single auricle and ventricle (4) Two auricles and one ventricle 32. Purkinje cell are found in (1) Right aurical of heart (2) Left ventrical of heart (3) Junction of right and left ventrical (4) Middle layer of cerebellum 33. Which is incorrect match (1) Nematodes – roundworms, pseudocoelomate (2) Cnidarians – polyp and medusa form, radially symmetrical (3) Platyhelminthes – flat, acoelomate (4) Porifers – gastrovascular cavity, pseudocoelomates 34. Greater trochanter and lesser trochanter are found in (1) Scapula (2) Lumber vertebra (3) Femur (4) Humerus 35. Which of the following statements is not correct about earthworm 36. 36. - : Rough Space : - [6] Biology-XI The direction of flow in the secretory pathway of secreting protein in the pancreatic cell is (1) 1, 2, 3, 4, 5 (2) 2, 4, 3, 1, 5 (3) 2, 1, 4, 3, 5 (4) 1, 2, 5, 3, 4 37. In brain the region for perception of pain is located in (1) Temporal lobe (2) Parietal lobe (3) Frontal lobe (4) Occipital lobe 38. Which of the following is incorrect (1) Whale is the largest fish (2) Insects have three pair of legs (3) Platyhelminthes have flame cells for excretion (4) All the mammals have mammary glands but may not have hair 39. The primary function of the bones of the middle ear in human hearing is to (1) Amplify the sound stimulus (2) Filter high frequency sounds from the sound stimulus (3) Enable the direction of a sound stimulus to be detected (4) Enable the ability to distinguish different sound frequencies 40. If Henle’s loop were absent from mammalian nephron, which of the following is to be expected (1) There will be no urine formation (2) There will be hardly any change in the quality and quantity of urine formed (3) The urine will be more concentrated (4) The urine will be more dilute 41. Microsome is the collective name for (1) Cytoplasmic cell organelle obtained after centrifugation of the cell (2) Mass of substances biosynthesized in the cell (3) Artificially generated disrupted membrane fragments of granular endoplasmic reticulum (4) Group of ribosomes participating in synthesis of polypeptide chains using the same m-RNA 42. Which of the following is false statement about sympathetic Nervous system (l) Sympathetic Nervous system is also called as thoracico-lumbar outflow (2) Sympathetic Nervous system prepare the body for emergency condition - : Rough Space : - [7] Biology-XI (3) Sympathetic Nervous system has ciliary ganglia (4) Sympathetic Nervous system is formed by spinal Nerves but not of cranial Nerves 43. Which of the following is correct Ptylin; Cl (1) Starch   Maltose + Dextrin + Isomltose (2) H O + CO  Carboxidas e H CO  Carbonic   H+ + HCO - 2 2  2 3 Anhydrase 3 (3) Starch Amylopsin  Maltose + Lactose + Glucose (4) All of these 44. The enzyme which is required for oxidative phosphorilation is present in which part of oxisome (1) F1 of head piece (2) F0 of elementary particle (3) F5 or Oligomycin Sensitivity Conferring Protein (4) F6 or Fc2 of stalk 45. Which of the following blood vessel carries pure blood (1) Pulmonary Artery (2) Umbilical Artery (3) Umbilical vein (4) None of these 46. Match the following columns Column I Column II (Cells) (Examples) A. Flame cells p. Sponges B. Collar cells q. Hydra C. Stinging cells r. Planaria s. Ascaris (1) A = r, B = p, C = q (2) A = s, B = p, C = q (3) A = r, B = s, C = P (4) A = s, B = q, C = r - : Rough Space : - [8] Biology-XI 47. Which of the following is the best evidence for the lock and key theory of enzyme action? (1) All isolated enzymes have been identified as proteins (2) Compounds similar in structure to the substrate inhibit the reaction (3) Enzymes are functional only in living organisms and speed up certain reactions (4) Enzymes determine the direction of a reaction 48. During an injury Nasal septum gets damaged and for it’s recovery which cartilage prefered. (1) Elastic cartilage (2) Hyaline cartilage (3) Calcified cartilage (4) Fibrous cartilage 49. Feeling the tremors of an earthquake a scared resident of seventh floor of a multistoried buildiing starts climbing down the stairs rapidly. Which hormone initiated this action (1) Gastrin (2) Thyroxin (3) Adrenaline (4) Glucagon 50. When the product acts as a inhibitor and brings about conformational changes in the active sites of enzymes resulting in reduction of catalytic activity, such a mechanism is called as (1) Competitive inhibition (2) Allosteric inhibition (3) Non-competitive inhibition (4) Positive inhibition - : Rough Space : - [9] Biology-XII CLASS XI – BIOLOGY 1. (2) 2. (2) 3. (4) 4. (3) 5. (1) 6. (4) 7. (2) 8. (2) 9. (3) 10. (2) 11. (3) 12. (1) 13. (2) 14. (2) 15. (2) 16. (1) 17. (3) 18. (2) 19. (3) 20. (4) 21. (4) 22. (3) 23. (3) 24. (2) 25. (1) 26. (2) 27. (3) 28. (1) 29. (1) 30. (2) 31. (4) 32. (4) 33. (4) 34. (3) 35. (2) 36. (1) 37. (2) 38. (1) 39. (1) 40. (4) 41. (3) 42. (3) 43. (1) 44. (1) 45. (3) 46. (1) 47. (2) 48. (2) 49. (3) 50. (2) - : Rough Space : - [10]