BHU B.Sc. Biology UET 2018 Question with Complete Solution

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.

Option (2) : Nodes with buds

Explanation : Eyes on potato tubers are usually germinating eye bud represents nodes with buds.

Option (2) : Phytochrome

Explanation : These movements are light mediated & phytochrome is responsible for this movement.

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.

Option (2) : Polypeptide chain

Explanation :  Chain of Amino Acids + Peptide bond = Polypeptide chain

Option (1) : Ethylene

Explanation : Ethylene responsible for ripening of fruits.

                            eg. Citrus, Orange, Banana etc….

1. Mesocarp
2. Pericarp
3. Endocarp
4. Endosperm

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.

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).

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”.

Option (2) :  Oxygenation

Explanation :  The light dependent uptake of O₂ & release of CO₂ in C₃ photosynthetic cell is called photo-respiration or C₂ cycle.

Option (2) :  Papaver somniferum       

Explanation :  Morphine, Heroin etc. are opoids extracted from the latex  of poppy plant Papaver somniferum.

Option (4) :  Photoperiod

Explanation :  Photoperiod is effect or requirement of relative length of day & night on flowering plants which influences flowering process.

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.

Option (2) :  Nitrogenase

Explanation :  N₂ fixation requires 3 components

1. A strong reducing agent NADH₂ (FADH₂)
2. ATP
3. Nitrogenase enzyme (formed by nitgene)

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.

Option (4) : Lipids

Explanation :  Major constituent of plasma- membrane is as follows

                                                     Lipids = 40%

                                                Proteins = 58.59%

                                           Carbohydrate = 1 – 2 %

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. 

Option (3) :  Saprophyte  

Explanation :  Fungus Rhizopus feeds on dead and decaying plant material ; hence of saprophyte nature.  

Option (2) :  Kranz Anatomy

Explanation :  Kranz (wreath) anatomy present in leaves of C₄ plants is specific features of C₄ plants.

Option (2) :  Nostoc

Explanation :  In coralloid roots of cycas, blue green algae present.

                              eg. Nostoc, Anabena 

Option (3) :  Non-flagellate  

Explanation :  Unicellular green alga chlorella is non-flagellate.

Option (4) :  Phycobillins  

Explanation :  Phycobillin is red or blue photosynthetic pigment present in photosynthetic algae and cyanobact’eria is proteinaceous & water soluble.

Option (2) : Basidiospores  

Explanation :  Telutospore undergoes meiotic division to give basidiopores as they are product of meiotic division.

Option (3) :  Columella  

Explanation :  In moss, the middle sterile part of capsule is called columella made up of parenchymatous tissue cells.

Option (3) :  Biofertilizer

Explanation :  Azolia is rich is proteins, essentials AminoAcids, vitamin & minerals is an important source of biofertilizer for wetland paddy.

Option (3) :  Echinodermata 

Explanation :  Water vascular system is characteristics feature of Echinodermata.

Option (3) :  Notochord is present only in larval tail region

Option (1) :  Crocodile  

Explanation :  Except crocodile, having 4 -chambered heart, all reptiles have 3 -chambered heart with 2 atria and 1 ventricle.

Option (4) :  Protostome  

Explanation :  During embryonic development & mouth develops from Blastomere this condition kla protostome.

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.

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.

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. 

Option (1) :   Bioluminescence     

Explanation :  The bioluminescent organisms have a special organ that produces light through a chemical reaction.

Option (4) :   Restriction endonuclease

Explanation :  Restriction endonuclease enzyme are the most widely used for gene cloning.

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.

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.

Option (2) :   Missense mutation

Explanation :  A missense mutation is the type of mutation in which single base pair causes replacement of different amino acid.

Option (2) :  Chromosome 1

Explanation :  Chromosome 1 is the largest chromosome having over 240 million bp.

Option (1) :   Its amphipathic nature

Explanation :  It means they have hydrophilic head and hydrophobic tail so they orient themselves accordingly in bilayer.

Option (4) :  Kala azar

Explanation : Leishmaniasis is causes by Protozoa parasite, Kala azar is one of the diseases caused by Leishmania.

Option (3) :  three ATP

Explanation :               1 NADH  =  3 ATP 

                                     1 FADH₂  =  2 ATP

                                         1 GTP  =  2 ATP

Option (1) :  decreased

Explanation :  catalyt or enzyme catalyzed reaction lower the activation energy for reaction.

Option (3) :   Short DNA fragments synthesized on lagging strand 

Explanation :  In Replication fork the lagging strand on which short DNA fragments are synthesised. 

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.

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.

Option (2) :  Rennin

Explanation :  Rennin present in the gastric juice of infants digests milk protein casein.

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.

Option (4) :  IgA

Explanation :  IgA primary antibodies present in colostrum (first milk after baby born), also present in saliva, mucous, sweat, tears etc.