1. Which of the following statements are correct?
(i) When a fruit develops from the inflorescence, it is called composite fruit.
(ii) Mesocarp is the edible part in an apple.
(iii) Gynobasic style is seen in Ocimum.
(iv) Hypanthodium is a special type of inflorescence found in Euphorbia species.
(a) (i)and(iv) (b) (i) and (iii)
(c) (i) and (ii) (d) (ii), (iii) and (iv)
2. Thorn is a modified branch because
(a) it is hard, straight and pointed
(b) it is a part of the plant
(c) it arises in the axil of a leaf
(d) it is a defensive organ.
3. Select the correct option with respect to mitosis.
(a) chromatids separate but remain in the centre of the cell in anaphase
(b) chromatids start moving towards opposite poles in telophase
(c) Golgi complex and endoplasmic reticulum are still visible at the end of prophase.
(d) chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase.
4. Which of the following is the correct pathway of absorbed water in the roots of plants?
(a) Soil water -> root hair cell -» cortical cells —> pericyde -»passage cells —> xylem.
(b) Soil water -> root hair cell —»passage cells cortical cells -> xylem -»pericyde.
(c) Soil water root hair cell —> pericyde —> cortical cells -»passage cells —> xylem.
(d) Soil water —> root hair cell -»cortical cells -»passage cells —> pericyde —> xylem.
5. Cel IA has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be
(a) no movement of water
(b) equilibrium between the two
(c) movement of water from cell A to B
(d) movement of water from cell B to A.
6. Which of the following element plays an important role in biological nitrogen fixation?
(a) Copper (b) Molybdenum
(c) Zinc (d) Calcium.
7. Which of the following characteristics out of A, B and C are exhibited by C4 plants?
(a) Kranz anatomy
(b) The first product of photosynthesis is oxaloacetic acid.
(c) Both PEP carboxylase and RuBiSco act as carboxylating enzymes.
(d) All of these.
8. Match the growth regulators in Column-I with the processes in Column-ll and choose the correct combination from the options given.
9. The correct route through which pulse-making impulse travels in the heart is
(a) SA node -> Purkinje fibres -> bundle of His —> AV node -»heart muscles
(b) SA node —> AV node —> bundle of His —> Purkinje fibres
(c) AV node -»bundle of His —> SA node —> Purkinje fibres
(d) AV node -»SA node —> Purkinje fibres —> bundle of His
10. Which statement is correct for muscle contraction?
(a) Length of H-zone decreases
(b) Length of A-band decreases
(c) Length of l-band increases
(d) Length of two Z-lines increases.
11. Cornea transplant in humans is almost never rejected. This is because
(a) it is composed of enucleated cells
(b) it is a non-living layer
(c) its cells are least penetrable by bacteria
(d) it has no blood supply.
12. What is true about cleavage in the fertilized egg in humans?
(a) It starts while the egg is in Fallopian tube
(b) It starts when the egg reaches uterus
(c) It is meroblastic
(d) It is identical to the normal mitosis.
13. Layers of an ovum from outside to inside is
(a) corona radiata, zona pellucida and vitelline membrane
(b) zona pellucida, corona radiata and vitelline membrane
(c) vitelline membrane, zona pellucida and corona radiata
(d) zona pellucida, vitelline membrane and corona radiata.
14. GIFT involves transfer of
(a) a mixture of sperms and ova into the uterus
(b) embryo into the uterus
(c) a mixture of sperms and ova into the Fallopian tube
(d) zygote into the Fallopian tube.
15. Given below are five statements (i-v) regarding contrivances to ensure cross pollination in plants.
(i) Didiny – Anthers and stigmas mature at different times in a bisexual flower.
(ii) Dichogamy – Flowers are unisexual.
(iii) Prepotency – Pollen grains of same flower germinate more rapidly over the stigma than the pollen grains of another flower.
(iv) Heterostyly – Two or three type of flowers with different heights of styles.
(v) Herkogamy – A mechanical device to prevent self pollination.
Which of the above statements are correct?
(a) (i)and(ii) (b) (i), (ii) and (iii)
(c) (iii), (iv) and (v) (d) (iv)and(v).
16. Which one of the following pairs is correctly matched?
(a) Ribosomal RNA – carries aminoacids to the site of protein synthesis.
(b) Transcription – process by which proteins are synthesised.
(c) Translation – process by which mRNA synthesis takes place.
(d) Anticodon • site of IRNA molecule that contains complementary bases to the triple code on the mRNA.
17. How many types of genetically different gametes will be produced by a heterozygous plant having the genotype AABbCc?
(a) Two (b) Four
(c) Six (d) Nine.
19. Originating in bone marrow, circulating in blood for 1-2 days, migrating to connective tissue and forming macrophages is a characteristic of
(a) eosinophils (b) basophils
(c) monocytes (d) lymphocytes.
20. Match the following list of bacteria and their commercially important products
21. Ecological niche is
(a) the surface area of the ocean
(b) an ecologically adapted zone
(c) the physical position and functional role of a species within the community
(d) formed of all plants and animals living at the bottom of a lake.
22. The process of mineralisation by microorganisms helps in the release of
(a) inorganic nutrients from humus
(b) both organic and inorganic nutrients from detritus
(c) organic nutrients from humus
(d) inorganic nutrients from detritus and formation of humus.
23. Which of the following is not a cause for loss of biodiversity?
(a) Destruction of habitat
(b) Invasion by alien species
(c) Keeping animals in zoological parks
(d) Over-exploitation of natural resources.
24. Which of the following is the correct sequence of taxonomic categories ?
25. Which of the following statements is correct?
(a) In chlorophyceae the stored food material is starch and the major pigments are chlorophyll-a and b.
(b) In phaeophyceae, laminarin is the stored food and major pigments are chlorophyll-a and b.
(c) In rhodophyceae, floridean starch is the stored food and the major pigments are chlorophyll-a, d and phycoerythrin.
(d) both (a) and (c)
26. The type of epithelial cells which line the inner surface of Fallopian tubes, bronchioles and small bronchi are known as
(a) squamous epithelium (b) columnar epithelium
(c) ciliated epithelium (d) cubical epithelium.
27. Excretion in cockroach takes place by
(a) nephridium (b) parotid gland
(c) coxal glands (d) Malpighian tubules.
28. The synaptonemal complex is formed during which stage of meiosis?
(a) Pachytene (b) Diplotene
(c) Diakinesis (d) Zygotene
29. What is the function of enterogastrone?
(a) It regulates the flow of bile.
(b) It inhibits the secretion of gastric juice.
(c) It stimulates the flow of pancreatic juice.
(d) It stimulates the secretion of digestive juice in the stomach.
30. In the tissues, high concentration of carbon dioxide
(a) increases the affinity of haemoglobin to both oxygen and hydrogen
(b) increases the affinity of haemoglobin to oxygen but decreases its affinity to hydrogen
(c) decreases the affinity of haemoglobin to oxygen but increases its affinity to hydrogen
(d) decreases the affinity of haemoglobin to both oxygen and hydrogen.
31. Select the correct match of a sexually transmitted disease with its pathogen?
(a) Syphilis – Treponema pallidum
(b) Gonorrhoea – Entamoeba histolytica
(c) Urethritis – Bacillus anthracis
(d) Softsore – Bacillus brevis
32. Which of the following is a method of birth control?
(a) lUDs (b) GIFT
(c) ZIFT (d) IVF-ET.
33. In a typical complete, bisexual and hypogynous flower, the arrangement of floral whorls on the thalamus from the outermost to the innermost is
(a) calyx, corolla, androecium and gynoecium
(b) calyx, corolla, gynoecium and androecium
(c) gynoecium, androecium, corolla and calyx
(d) androecium, gynoecium, corolla and calyx.
34. In a fertilized embryo sac, the haploid, diploid and triploid structures are respectively
(a) synergid, zygote and primary endosperm nucleus
(b) synergid, antipodal and polar nuclei
(c) Antipodal, synergid and primary endosperm nucleus
(d) synergid, polar nuclei and zygote.
35. The central dogma of protein synthesis is
(a) protein —> RNA v — DNA
(b) protein , DNA -» RNA
(c) RNA —» DNA —> protein
(d) DNA v – RNA -> protein.
36. Which one of the following is not an autoimmune disease?
(a) Graves’disease (b) Addison’s disease
(c) Rheumatoid arthritis (d) Insomnia
37. Which of the following statements about breeding is wrong?
(b) Continued inbreeding, especially close inbreeding reduces fertility and productivity.
(c) Cross-breeding allows desirable qualities of two different breeds to be combined.
(d) Inbreeding exposes harmful recessive genes that are eliminated by selection.
38. Match Column-I with Column-ll and select the correct option.
39. Some of the steps involved in the production of humulin are given below. Select the correct sequence.
(i) Synthesis of gene (DNA) for human insulin artificially.
(ii) Culturing recombinant E.coii in bioreactors.
(iii) Purification of humulin.
(iv) Insertion of human insulin gene into plasmid.
(v) Introduction of recombinant plasmid into E.coii.
(vi) Extraction of recombinant gene product from E.coii.
(a) (ii), (i), (iv), (iii), (v), (vi)
(b) (i), (iii), (v), (vi), (ii), (iv)
(c) (i), (iv), (v), (ii), (vi), (iii)
(d) (iii), (v), (ii), (i), (vi), (iv)
40. A probe which is a molecule used to locate specific sequences in a mixture of DNA or RNA molecules could be
(a) a single stranded RNA
(b) a single stranded DNA
(c) either RNA or DNA
(d) can be ss DNA but not ss RNA.
41. An ecological pyramid of energy is the best representation of the ecosystem’s
(a) energy flow through each trophic level
(b) population in each food web
(c) biomass at each trophic level
(d) all of the above.
42. Select the incorrect statement.
(a) The Montreal protocol is associated with the control of emission of ozone depleting substances.
(b) Methane and carbon dioxide are greenhouse gases.
(c) Dobson units are used to measure oxygen content.
(d) Use of incinerators is crucial for the disposal of hospital wastes.
43. Increase in concentration of a toxicant at successive trophic levels is called
(a) algal bloom (b) accelerated eutrophication
(c) biomagnification (d) cultural eutrophication.
44. Which of the following is an egg laying mammal?
(a) Kangaroo (b) Duck-billed Platypus
(c) Penguin (d) Whale
45. Schwann’s cells are present on which part of a neuron?
(a) Dendrites (b) Axon hillock
(c) Axon (d) Soma/body
46. Identify the families to which given floral diagrams belong.
(a) A – Liliaceae, B – Asteraceae
(b) A – Asteraceae, B – Solanaceae
(c) A – Asteraceae, B – Fabaceae
(d) A – Poaceae, B – Solanaceae
47. Guttation is the release of liquid water from veins at the leaf margins. It is caused by
(a) transpiration (b) high leaf pressure
(c) high root pressure
(d) clogged tracheids or vessel elements.
48. Select the correct statement.
(a) The C4 plants do not have Rubisco.
(b) Carboxylation of RuBP leads to the formation of PGA and phosphoglycolate.
(c) Carboxylation of phosphophenol pyruvate results in the formation of C4 acids.
(d) Decarboxylation of C4 acids occurs in the mesophyll cells.
49. Exchange of gases in the alveoli of lungs takes place through
(a) osmosis (b) simple diffusion
(c) active transport (d) passive transport.
50. In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart?
(a) S – Start of systole
(b) T – Depolarization of ventricles
(c) P – Depolarisation of the atria
(d) R – Repolarisation of ventricles
51. Glucose and amino acids are reabsorbed in the
(a) proximal tubule (b) distal tubule
(c) collecting duct (d) loopofHenle.
52. Diabetes insipidus occurs due to the hyposecretion of
(a) thymosine (b) oxytocin
(c) insulin (d) vasopressin.
53. What is the function of progesterone which is present in oral contraceptive pills ?
(a) To inhibit ovulation
(b) To check oogenesis
(c) To check entry of sperms into cervix
(d) To check sexual behaviour.
54. Which of the following sequences will be produced as a result of transcription of the DNA sequence CGATTACAG?
(a) GCUAAUGUC (b) CGUAAUCUG
(c) GCTAATGTC (d) GCUAATCTG.
55. The term ‘totipotency’ refers to the capacity of a
(a) cell to generate whole plant
(b) bud to generate whole plant
(c) seed to germinate
(d) cell to enlarge in size.
56. Mycorrhizae help the host plant in
(a) enhancing its phosphorus uptake capacity.
(b) increasing its tolerance to drought
(c) enhancing its resistance to root pathogens
(d) all of these.
57. Catalytic converters are fitted into automobiles to reduce emission of harmful gases. Catalytic converters change unburnt hydrocarbons into
(a) carbon dioxide and water
(b) carbon monoxide
(d) carbon dioxide and methane.
58. Photochemical smog formed in congested metropolitan cities mainly consists of
(a) ozone, peroxyacetyl nitrate and NOx
(b) smoke, peroxyacetyl nitrate and S02
(c) hydrocarbons, S02 and C02
(d) hydrocarbons, ozone and SCL
59. Which one of the following graphs shows the relationship between the rate of an enzymatic activity and substrate concentration (S)?
61. Which of the following relations is correct ?
62. Hydroponics is
(a) cultivation of plants in pure water
(b) growth of plants towards water
(c) growth of plants away from water
(d) soil-less cultivation of plants.
63. Match the number of carbon atoms given in List -1 with that of the compounds given in List – II and select the correct
64. Vitellogenesis occurs during the formation of
(a) ootid in the Fallopian tube
(b) secondary oocyte in the Fallopian tube
(c) primary oocyte in the Graafian follicle
(d) oogonial cell in the Graafian follicle.
65. Diaphragms are contraceptive devices used by the females. Choose the correct option from the statements given below.
(i) They are introduced into the uterus.
(ii) They are placed to cover the cervical region
(iii) They act as physical barriers for sperm entry
(iv) They act as spermicidal agents.
(a) (i) and (ii) (b) (i) and (iii)
(c) (ii) and (iii) (d) (iii) and (iv).
66. Brunner’s gland is present in
(a) liver (b) duodenum
(c) oesophagus (d) stomach.
67. If 10 joules of energy is available at the producer level, then amount of energy present at the level of secondary consumers is
(a) 10 J (b) 1J
(c) 0.1 J (d) 0.01 J
68. Given below are a few statements regarding somatic hybridization. Choose the correct statements.
(i) Protoplasts of different cells of the same plant are fused.
(ii) Protoplasts from cells of different species can be fused.
(iii) Treatment of cells with cellulase and pectinase is mandatory.
(iv) The hybrid protoplast contains characters of only one parental protoplast.
(a) (ii) and (iii) (b) (i)and(ii)
(c) (iii) and (iv) (d) (i) and (iii).
69. Match the following and select the correct option.
Which of the following organisms is used in the production of human insulin by genetic engineering?
(a) Escherichia coli
(b) Agrobacterium tumefaciens
(c) Bacillus thuringiensis
(d) Saccharomyces cerevisiae.
71. Which one of the following is a correct statement?
(a) “Bt” in “Bt-cotton“ indicates that it is a genetically modified organism produced through biotechnology.
(b) Somatic hybridization involves fusion of two complete plant cells carrying desired genes.
(c) The anticoagulant hirudin is being produced from transgenic Brassica napus seeds.
(d) “Flavr savr” variety of tomato has enhanced the production of ethylene which improves its taste.
72. Which of the following would necessarily decrease the density of a population in a given habitat?
(a) Natality and mortality
(b) Immigration and emigration
(c) Mortality and emigration
(d) Natality and immigration.
73. The sequence of communities of primary succession in water is
(a) phytoplankton, sedges, free-floating hydrophytes, rooted hydrophytes, grasses and trees.
(b) phytoplankton, free-floating hydrophytes, rooted hydrophytes, sedges, grasses and trees.
(c) free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses and trees.
(d) phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow and trees.
74. Hot spots are the areas for in s/Tu conservation.The key criteria for determining a hot spot is/are
(a) location in developed/undeveloped country
(b) vicinity to the sea
(c) number of endemic species and degrees of threat
(d) all of the above.
75. Which of the following statements is correct?
(a) Parthenium is an endemic species of our country.
(b) African catfish is not a threat to indigenous catfishes.
(c) Steller’s sea cow is an extinct animal.
(d) Lantana is popularly known as carrot grass.
76. Read the given statements and select the correct option. Statement 1 : Chloroplast and mitochondria are semi- autonomous bodies.
Statement 2: Chloroplast and mitochondria have their own DNA and protein synthesizing machinery.
(a) Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
(b) Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
(c) Statement 1 is correct and statement 2 is incorrect.
(d) Both statements 1 and 2 are incorrect.
77. Calcium metabolism in birds gets disturbed due to the effect of
(a) mercury (b) cadmium
(c) DDT (d) lead
78. The graph given shows an oxygen dissociation curve for haemoglobin. Where in the body will haemoglobin be saturated at the percentages shown at points 1, 2 and 3 on the graph?
79. Viruses can be considered as living because they
(a) reproduce in host cells
(b) respond to touch stimulus
(c) carry out metabolic activities
(d) carry out anaerobic respiration.
80. Which of the following trait is controlled by dominant autosomal genes?
(a) Polydactyly (b) Huntington’s chorea
(c) PTC (phenylthiocarbamide) tasting
(d) All of these
81. Result of a cross between a normal homozygous female and a haemophiliac male would be
(a) normal males and normal females
(b) haemophiliac males and normal females
(c) normal males and carrier females
(d) haemophiliac males and carrier females.
82. Dialysis is done when a person is suffering from
(a) diabetes (b) uraemia
(c) polyurea (d) haemolysis.
83. Two examples in which the nitrogenous wastes are excreted from body in the form of uric acid are
(a) birds and lizards (b) insects and bony fishes
(c) mammals and molluscs
(d) frogs and cartilaginous fishes.
84. Match the two columns and select the correct option.
85. In one polynucleotide strand of a DNA molecule the ratio of A + T/G + Cis0.3.WhatistheA + G/ T + C ratio of the entire DNA molecule?
(a) 0.3 (b) 0.6
(0 1.2 (d) 1
86. The sequence of structural genes in lac operon is
(a) Lac A, LacX Lac 2 (b) Lac A, Lad, LacY
(c) Lac Y, Lac 1, Lac A (d) Lac Z, Lac Y Lac A.
87. In a grazing food chain, carnivores may also be referred to as
(a) primary producers (b) secondary producers
(c) primary consumers (d) secondary consumers
88. Which of the following strategies is not a correct approach to reduce the global warming?
(a) Cutting down use of fossil fuel.
(b) Improving efficiency of energy usage.
(c) Reducing deforestation.
(d) Cutting trees and increasing the growth of human population.
89. Who among the following was awarded the Nobel Prize for the development of PCR technique?
(a) Herbert Boyer (b) Har Govind Khurana
(c) KaryMullis (d) Arthur Kornberg
90. While isolating DNA from bacteria, which of the following enzymes is not used?
(a) Lysozyme (b) Ribonudease
(c) Deoxyribonuclease (d) Protease