BHU B.Sc. Biology UET 2018 Question with Complete Solution
Q1. Composition of nucleoside is :
- Purine/ Pyramidine + Phosphate
- Purine / Pyramidine + Sugar
- Pyramidine + Purine + Phosphate
- Purine + Sugar + Phosphate
Option (2) : Purine / Pyramidine + Sugar
Explanation : In nucleoside there is no phosphate group hence, option (2) is the only where no phosphate group.
Nucleoside = Nitrogenous base + pentose sugar.
Q2. Eyes on potato tubers represent :
- Nodes with buds
Option (2) : Nodes with buds
Explanation : Eyes on potato tubers are usually germinating eye bud represents nodes with buds.
Q3. Which one of the following is involved in photo-morphogenetic movements ?
Option (2) : Phytochrome
Explanation : These movements are light mediated & phytochrome is responsible for this movement.
Q4. Tyloses are :
- Lactiferous channels
- Secretory cells
- Sieve plates
- Tracheal plugs plugging the lumen of vessels and tracheids
Option (4) : Tracheal plugs plugging the lumen of vessels and tracheids
Explanation: The balloon shaped structures called tracheal plugs formed in the xylem vessel of heartwood, due to intrusions of secondary xylem parenchyma are called tyloses. These tracheal plugs plug the lumen of vessels & tracheids.
Q5. A chain of amino acids joined by peptide bonds is called as :
- Peptide chain
- Polypeptide chain
- Polyamino acid chain
- Nucleotide chain
Option (2) : Polypeptide chain
Explanation : Chain of Amino Acids + Peptide bond = Polypeptide chain
Q6. The hormone responsible for ripening of fruits is :
Option (1) : Ethylene
Explanation : Ethylene responsible for ripening of fruits.
eg. Citrus, Orange, Banana etc….
Q7. Coir, the commercial product of coconuts is :
Option (1) : Mesocarp
Explanation : Coir, the commercial product of coconout is fleshy; becomes husk on drying is a natural fibre obtained from mesocarp of coconout fruit.
Q8. Deficiency of molybdenum causes :
Option (4) : Necrosis
Explanation : Molybdenum deficiency results in poor nitrate reductase activity which leads to development of symptoms like pale yellow with interveinal and marginal chlorosis (yellowing) and necrosis (scald).
Q9. Law of limiting factor was given by :
Option (1) : Blackman
Explanation : The law of limiting factors given by Blackman states that “when a process is conditioned to its rapidity by a number of factors, then role of process is limited by the pace of the slowest factor”.
Q10. The first reaction in photorespiration is :
Option (2) : Oxygenation
Explanation : The light dependent uptake of O2 & release of CO2 in C3 photosynthetic cell is called photo-respiration or C2 cycle.
Q11. Morphine is obtained from :
- Aconitum nacelles
- Papaver somniferum
- Rauwolffia serpentine
- Cinchona officinalis
Option (2) : Papaver somniferum
Explanation : Morphine, Heroin etc. are opoids extracted from the latex of poppy plant Papaver somniferum.
Q12. The factor influencing process of flowerings is :
- Amount of chlorophyll
- Soil water
- Soil p11
Option (4) : Photoperiod
Explanation : Photoperiod is effect or requirement of relative length of day & night on flowering plants which influences flowering process.
Q13. Plant group known as vascular cryptogam is :
Option (1) : Pteridophytes
Explanation: Pteridophytes is the vascular plant but they produces neither flower nor seeds, hence are referred to as “cryptogams (hidden reproduction), hence they are called as vascular cryptogams.
Q14. Major enzyme involved in atmospheric nitrogen fixation:
- Nitrate reductase
Option (2) : Nitrogenase
Explanation : N2 fixation requires 3 components
- A strong reducing agent NADH2 (FADH2)
- Nitrogenase enzyme (formed by nitgene)
Q15. Which one is most primitive ?
Option (2) : Bacteria
Explanation : Archaebacteria is the most primitive when we go through evolutionary pattern and Cyanobacteria evolved after them so bacteria is the correct answer.
Q16. Major constituent of plasma membrane is:
Option (4) : Lipids
Explanation : Major constituent of plasma- membrane is as follows
Lipids = 40%
Proteins = 58.59%
Carbohydrate = 1 – 2 %
Q17. Trimerous floral characteristic is found in the family :
Option (3) : Liliaceae
Explanation : A flowers may be trimerous tetramerous or pentamerous when the floral appendages are in the multiple of 3,4 or 5 respectively.
Q18. The fungus Rhizopus occurs in the nature as :
Option (3) : Saprophyte
Explanation : Fungus Rhizopus feeds on dead and decaying plant material ; hence of saprophyte nature.
Q19. The specific characters of C4 plant is :
- Bulliform cells
- Kranz anatomy
- Parallel venation
- Isobilateral leaf
Option (2) : Kranz Anatomy
Explanation : Kranz (wreath) anatomy present in leaves of C4 plants is specific features of C4 plants.
Q20. Which of the following is found as endosymbiotic diazotrophic microorganism
Option (2) : Nostoc
Explanation : In coralloid roots of cycas, blue green algae present.
eg. Nostoc, Anabena
Q21. The unicellular green alga Chlorella is :
Option (3) : Non-flagellate
Explanation : Unicellular green alga chlorella is non-flagellate.
Q22. Which of the algal photosynthetic pigment is proteinaceous and water soluble ?
Option (4) : Phycobillins
Explanation : Phycobillin is red or blue photosynthetic pigment present in photosynthetic algae and cyanobact’eria is proteinaceous & water soluble.
Q23. Which one of the following spore of Puccinia is the product of meiotic division ?
Option (2) : Basidiospores
Explanation : Telutospore undergoes meiotic division to give basidiopores as they are product of meiotic division.
Q24. In moss, the middle sterile part of capsule is called :
- Spore sac
Option (3) : Columella
Explanation : In moss, the middle sterile part of capsule is called columella made up of parenchymatous tissue cells.
Q25. Azolla is an important source of :
Option (3) : Biofertilizer
Explanation : Azolia is rich is proteins, essentials AminoAcids, vitamin & minerals is an important source of biofertilizer for wetland paddy.
Q26. Water vascular system is characteristic of :
Option (3) : Echinodermata
Explanation : Water vascular system is characteristics feature of Echinodermata.
Q27. In Urochordata :
- Notochord is not present
- Notochord is present throughout the life
- Notochord is present only in larval tail region
- Notochord is replaced by vertebral column
Option (3) : Notochord is present only in larval tail region
Q28. Four chambered heart is present in :
- Zebra fish
- Sea horse
Option (1) : Crocodile
Explanation : Except crocodile, having 4 -chambered heart, all reptiles have 3 -chambered heart with 2 atria and 1 ventricle.
Q29. If mouth develops from blastopore, the animal is called :
Option (4) : Protostome
Explanation : During embryonic development & mouth develops from Blastomere this condition kla protostome.
Q30. The total output of photosynthesis including the organic matter used up in respiration during the period of measurement, is called as :
- Net primary productivity
- Gross primary productivity
- Net community productivity
- Secondary productivity
Option (1) : Net primary productivity
Explanation : During photosynthesis, light energy is trapped as source of energy and carbon fixation done by absorbing CO2 in atmosphere and net product is sugar.
This phenomenon of net production of sugar is called Net primary productivity.
Q31. A population is a group of :
- Species in a community
- Individuals of a species in a given area
- Communities in an ecosystem
- Individual in a family
Option (2) : Individuals of a species in a given area
Explanation : Population is defined as a group of individuals of species present in a given or particular area.
Q32. Fossil remains of Archaeopteryx were recovered from the rocks of the :
- Triassic period
- Jurassic period
- Palaeozoic era
- Pliocene epoch
Option (2) : Jurassic period
Explanation : Fossil remains of Archaeopteryx were recovered from the rocks of the Jurassic period when the climatic conditions killed the dinosaurs.
Q33. Which of the following is an example of transformation of chemical energy to light energy ?
- Muscle contraction
- Ion transport
Option (1) : Bioluminescence
Explanation : The bioluminescent organisms have a special organ that produces light through a chemical reaction.
Q34. Which of the following enzymes is used extensively for gene cloning ?
- DNA methylase
- DNA topoisomerase
- Restriction endonuclease
Option (4) : Restriction endonuclease
Explanation : Restriction endonuclease enzyme are the most widely used for gene cloning.
Q35. In a centrifuge, separation of suspended particles is achieved by :
- Buoyant density
- Gravitational force
- Centrifugal force
- Centripetal force
Option (3) : Centrifugal force
Explanation : Centrifugation is a technique used for separation of particles from a solution according to their size, shape and density.
This is done by centrifugation of particulate mixture in a density gradient column.
Q36. In a diploid individual the number of allele will be :
- None of these
Option (2) : two
Explanation: In diploid individual, means one that has two copies of each chromosome two alleles will be there to make up the genotype of an individual.
Q37. 137. In a mutation if one amino acid is replaced by another amino acid, such mutation is termed as :
- Nonsense mutation
- Missense mutation
- Frame shift mutation
- Point mutation
Option (2) : Missense mutation
Explanation : A missense mutation is the type of mutation in which single base pair causes replacement of different amino acid.
Q38. Which of the following is the largest chromosome ?
- Satellite chromosome
- Chromosome 1
- Telocentric chromosome
- Polytene chromosome
Option (2) : Chromosome 1
Explanation : Chromosome 1 is the largest chromosome having over 240 million bp.
Q39. The membrane phospholipids form bilayer due to:
- Its amphipathic nature
- presence of unsaturated fatty acids in its head
- presence of saturated and unsaturated fatty acids in its tail
- presence of cholesterol along with phospholipids
Option (1) : Its amphipathic nature
Explanation : It means they have hydrophilic head and hydrophobic tail so they orient themselves accordingly in bilayer.
Q40. Weberian ossicles are found in :
- Cartilaginous fish
Option (4) : Osteochytes
Explanation : Weberian ossicles is a paired chain of 3 to 4 small bones in certain fishes which connects the air bladder since, air bladder present in osteochytes fishes. Hence, the correct answer is osteochytes fishes.
Q41. Hydra is :
Option (2) : Diploblastic
Explanation : Hydra is an example of coelenterate and in coelentrata diploblastic germ layer present.
Q42. Leishmania causes
- Sleeping sickness
- Kala azar
Option (4) : Kala azar
Explanation : Leishmaniasis is causes by Protozoa parasite, Kala azar is one of the diseases caused by Leishmania.
Q43. One NADH is oxidized by the electron transport system with subsequent production of :
- no ATP
- one ATP
- three ATP
- four ATP
Option (3) : three ATP
Explanation : 1 NADH = 3 ATP
1 FADH2 = 2 ATP
1 GTP = 2 ATP
Q44. In an enzyme catalyzed reaction, the energy of activation is :
- equal to free energy difference
Option (1) : decreased
Explanation : catalyt or enzyme catalyzed reaction lower the activation energy for reaction.
Q45. Okazaki fragments are :
- RNA primers
- Short DNA fragments synthesized on leading strand
- Short DNA fragments synthesized on lagging strand
- fragments generated by DNA polymerase
Option (3) : Short DNA fragments synthesized on lagging strand
Explanation : In Replication fork the lagging strand on which short DNA fragments are synthesised.
Q46. Initiation codon in eukaryotes is :
Option (4) : AUG
Explanation : Initiation codon is the first codon of a messanger RNA translated by a Ribosome start codon AUG codes for methionine in Eukaryotes.
Q47. A hollow ball of cells develop into three germ layers ectoderm, mesoderm and endoderm during the embryonic development, by the process of :
Option (2) : gastrulation
Explanation : Gastrulation is the process during which differentiation of three primary germ layers, formation of archenteron and migration of prospective endomesodermal cells.
Q48. Rennin present in the gastric juice of infants digests :
- nucleic acids
Option (2) : Rennin
Explanation : Rennin present in the gastric juice of infants digests milk protein casein.
Q49. A donor having blood group AB cannot donate his/ her blood to the receiver who has blood group O because :
- donor has both the antigens
- donor has both the antibodies
- recipient has both antigens
- donor has both the antigens and both the antibodies
Option (1) : donor has both the antigens
Explanation : In AB both antigens are present and in recipient ‘O’ both antigens are absent. So, if AB blood donated to ‘O’ transfusion reaction may occur and that would be very harmful for the patient.
Q50. The most abundant class of antibodies in milk is :
Option (4) : IgA
Explanation : IgA primary antibodies present in colostrum (first milk after baby born), also present in saliva, mucous, sweat, tears etc.