A. Detrivores perform fragmentation.
B. The humus is further degraded by some microbes during mineralization.
C. Water soluble inorganic nutrients go down into the soil and get precipitated by a process called
leaching.
D. The detritus food chain begins with living organisms.
E. Earthworms break down detritus into smaller particles by a process called catabolism.
Choose the correct answer from the options given below:
(1) B, C, D only
(2) C, D, E only
(3) D, E, A only
(4) A, B, C only
Answer (4)
27. The reaction centre PS II has an absorption maxima at
(1) 700 nm
(2) 660 nm
(3) 780 nm
(4) 680 nm
Answer (4)
28. In angiosperm, the haploid, diploid and triploid structures of a fertilized embryo sac sequentially are : (Learn more: Sexual reproduction in Angiosperms)
(1) Antipodals, synergids, and primary endosperm nucleus
(2) Synergids, Zygote and Primary endosperm nucleus
(3) Synergids, antipodals and Polar nuclei
(4) Synergids, Primary endosperm nucleus and zygote
Answer (2)
29. Which micronutrient is required for splitting of water molecule during photosynthesis?
(1) Molybdenum
(2) Magnesium
(3) Copper
(4) Manganese
Answer (4)
30. Which of the following stages of meiosis involves division of centromere?
(1) Metaphase II
(2) Anaphase II
(3) Telophase
(4) Metaphase I
Answer (2)
31. Cellulose does not form blue colour with Iodine because
(1) It is a helical molecule
(2) It does not contain complex helices and hence cannot hold iodine molecules
(3) It breakes down when iodine reacts with it
(4) It is a disaccharide
Answer (2)
32. Among ‘The Evil Quartet’, which one is considered the most important cause driving extinction of species?
(1) Over exploitation for economic gain
(2) Alien species invasions
(3) Co-extinctions
(4) Habitat loss and fragmentation
Answer (4)
33. What is the role of RNA polymerase III in the process of transcription in Eukaryotes?
(1) Transcription of tRNA, 5 srRNA and snRNA
(2) Transcription of precursor of mRNA
(3) Transcription of only snRNAs
(4) Transcription of rRNAs (28S, 18S and 5.8S)
Answer (1)
34. Given below are two statements :
Statement I : Endarch and exarch are the terms often used for describing the position of secondary xylem in the plant body.
Statement II : Exarch condition is the most common feature of the root system.
In the light of the above statements, choose the correct answer from the options given below:
(1) Both Statement I and Statement II are false
(2) Statement I is correct but Statement II is false
(3) Statement I is incorrect but Statement II is true
(4) Both Statement I and Statement II are true
Answer (3)
35. The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?
(1) Pachytene
(2) Diplotene
(3) Diakinesis
(4) Zygoten
Answer (1)
36. Given below are two statements : One labelled as Assertion A and the other labelled as Reason R :
Assertion A : In gymnosperms the pollen grains are released from the microsporangium and carried by air currents.
Reason R : Air currents carry the pollen grains to the mouth of the archegonia where the male gametes are discharged and pollen tube is not formed.
In the light of the above statements, choose the correct answer from the options given below :
(1) Both A and R are true but R is NOT the current explanation of A
(2) A is true but R is false
(3) A is false but R is true
(4) Both A and R are true and R is the correct explanation of A
Answer (2)
37. Which one of the following statements is NOT correct?
(1) Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries
(2) Water hyacinth grows abundantly in eutrophic water bodies and leads to an imbalance in the ecosystem dynamics of the water body
(3) The amount of some toxic substances of industrial waste water increases the organisms at successive trophic levels
(4) The micro-organisms involved in biodegradation of organic matter in a sewage polluted water body
consume a lot of oxygen causing the death of aquatic organisms
Answer (1)
38. Which of the following combinations is required for chemiosmosis?
(1) Membrane, proton pump, proton gradient, NADP synthase
(2) Proton pump, electron gradient, ATP synthase
(3) Proton pump, electron gradient, NADP synthase
(4) Membrane, proton pump, proton gradient, ATP synthase
Answer (4)
39. Match List I with List II :
List I List II
A. M Phase I. Proteins are synthesized
B. G2 Phase II. Inactive phase
C. Quiescent stage III. Interval between mitosis and initiation of DNA replication
D. G1 Phase IV. Equational division
Choose the correct answer from the options given below :
(1) A-IV, B-II, C-I, D-III
(2) A-IV, B-I, C-II, D-III
(3) A-II, B-IV, C-I, D-III
(4) A-III, B-II, C-IV, D-I
Answer (2)
40. Match List I with List II :
List I (Interaction) List II (Species A and B)
A. Mutualism I. +(A), O(B)
B. Commensalism II. –(A), O(B)
C. Amensalism III. +(A), –(B)
D. Parasitism IV. +(A), +(B)
Choose the correct answer from the options given below:
(1) A-IV, B-I, C-II, D-III
(2) A-IV, B-III, C-I, D-II
(3) A-III, B-I, C-IV, D-II
(4) A-IV, B-II, C-I, D-III
Answer (1)
41. Given below are two statements:
Statement I : Gause’s ‘Competitive Exclusion Principle’ states that two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually.
Statement II : In general, carnivores are more adversely affected by competition than herbivores.
In the light of the above statements, choose the correct answer from the options given below:
(1) Both Statement I and Statement II are false.
(2) Statement I is correct Statement II is false.
(3) Statement I is incorrec but Statement II is true.
(4) Both Statement I and Statement II are true.
Answer (2)
42. Match List I with List II: (Learn more: Mineral Nutrition)
List I List II
A. Iron I. Synthesis of auxin
B. Zinc II. Component of nitrate reductase
C. Boron III. Activator of catalase
D. Molybdenum IV. Cell elongation and differentiation
Choose the correct answer from the options given below:
(1) A-II, B-III, C-IV, D-I
(2) A-III, B-I, C-IV, D-II
(3) A-II, B-IV, C-I, D-III
(4) A-III, B-II, C-I, D-IV
Answer (2)
43. Which of the following statements are correct about Klinefelter’s Syndrome?
A. This disorder was first described by Langdon Down (1866).
B. Such an individual has overall masculine development. However, the feminine development is also
expressed.
C. The affected individual is short statured.
D. Physical, psychomotor and metal development is retarded.
E. Such individuals are sterile.
Choose the correct answer from the options given below:
(1) C and D only
(2) B and E only
(3) A and E only
(4) A and B only
Answer (2)
44. Identify the correct statements:
A. Lenticels are the lens-shaped openings permitting the exchange of gases.
B. Bark formed early in the season is called hard bark.
C. Bark is a technical term that refers to all tissues exterior to vascular cambium.
D. Bark refers to periderm and secondary phloem.
E. Phellogen is single-layered in thickness.
Choose the correct answer from the options given below:
(1) A and D only
(2) A, B and D only
(3) B and C only
(4) B, C and E only
Answer (1)
45. How many different proteins does the ribosome consist of?
(1) 60
(2) 40
(3) 20
(4) 80
Answer (4)
46. Melonate inhibits the growth of pathogenic bacteria by inhibiting the activity of
(1) Amylase
(2) Lipase
(3) Dinitrogenase
(4) Succinic dehydrogenase
Answer (4)
47. Match List I with List II :
List I List II
A. Cohesion I. More attraction in liquid phase
B. Adhesion II. Mutual attraction among water molecules
C. Surface tension III. Water loss in liquid phase
D. Guttation IV. Attraction towards polar surfaces
Choose the correct answer from the options given below :
(1) A – IV, B – III, C – II, D – I
(2) A – III, B – I, C – IV, D – II
(3) A – II, B – I, C – IV, D – III
(4) A – II, B – IV, C – I, D – III
Answer (4)
48. Match List I with List II :
List I List II
A. Oxidative decarboxylation I. Citrate synthase
B. Glycolysis II. Pyruvate dehydrogenase
C. Oxidative phosphorylation III. Electron transport system
D. Tricarboxylic acid cycle IV. EMP pathway
Choose the correct answer from the options given below :
(1) A – II, B – IV, C – I, D – III
(2) A – III, B – I, C – II, D – IV
(3) A – II, B – IV, C – III, D – I
(4) A – III, B – IV, C – II, D – I
Answer (3)
49. Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :
Assertion A : A flower is defined as modified shoot wherein the shoot apical meristem changes to floral meristem.
Reason R : Internode of the shoot gets condensed to produce different floral appendages laterally at successive node instead of leaves.
In the light of the above statements, choose the correct answer from the options given below :
(1) Both A and R are true but R is NOT the correct explanation of A
(2) A is true but R is false
(3) A is false but R is true
(4) Both A and R are true and R correct explanation of A
Answer (4)
50. Main steps in the formation of Recombinant DNA are given below. Arrange these steps in a correct sequence.
A Insertion of recombinant DNA into the host cell
B Cutting of DNA at specific location by restriction enzyme
C Isolation of desired DNA fragment
D Amplification of gene of interest using PCR
Choose the correct answer from the options given below :
(1) C, A, B, D
(2) C, B, D, A
(3) B, D, A, C
(4) B, C, D, A
Answer (2)