The pressure that must be applied to a solution to prevent the inward flow of water across a semi permeable membrane is called as:
1. Hydrostatic pressure
2. Water potential
3. Osmotic pressure
4. Osmotic potential
In a guard cell:
I. The outer walls are thick and elastic
II. Cellulose microfibrils are oriented longitudinally
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
With regard to the Biological Nitrogen Fixation by Rhizobium in association with soyabean, which one of the following statement/statements does not hold true?
1. Nitrogenase may require oxygen for its functioning .
2. Nitrogenase is MO-Fe protein.
3. Leg-hemoglobin is a pink coloured pigment.
4. Nitrogenase helps to convert gas into two molecules of ammonia.
Anoxygenic photosynthesis is characteristic of
1. Rhodospirillum
2. Spirogyra
3. Chlamydomonas
4. Ulva
C. B. van Niel proved that:
1. | Plants produce glucose when they grow. |
2. | Blue and red light are effective for photosynthesis. |
3. | It is only the green parts of the plants that could release oxygen. |
4. | Hydrogen from a suitable oxidizable compound reduces carbon dioxide to carbohydrates. |
In Section 14.1, it is written that most cells of a plant have at least a part of their surface in contact with air. The arguments in favor of this statement include all except:
1. Flattened leaves
2. Closely packed parenchyma in most regions
3. Presence of lenticels
4. Mostly dead cells in the interior
The Avena curvature is used for bioassay of
1.
2. IAA
3. Ethylene
4. ABA
Organisms that are tolerant for a wide range of salinity are called:
1. | Stenohalines | 2. | Euryhalines |
3. | Halophytes | 4. | Stenothermals |
An orchid growing as an epiphyte on a mango branch is an example of:
1. | Ectoparasitism | 2. | Endopararsitism |
3. | Commensalism | 4. | Mutualism |
MAB stands for:
1. Marine Algal Biology
2. Manmade Air Banks
3. Man and Biosphere
4. Mother and Baby welfare scheme
The function of the gap junction is to
1. facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules.
2. separate two cells from each other.
3. stop substance from leaking across a tissue.
4. performing cementing to keep neighbouring cells together.
Who proposed the fluid mosaic model of plasma membrane?
1. Camillo Golgi
2. Schneiden and Schwann
3. Singer and Nicolson
4. Robert Brown
The motile bacteria are able to move by:
1. | fimbriae | 2. | flagella |
3. | cilia | 4. | pili |
Given below is a schematic break-up of the phases/stages of cell cycle. Which one of the following is the correct indication of the stage/phase in the cell cycle?
|
Stems contain chlorophyll and carry out photosynthesis in:
1. Opuntia and Euphorbia | 2. Mint and Jasmine |
3. Pistia and Eichhornia | 4. Banana and Pineapple |
In mango, the fruit is:
1. | drupe and mesocarp is fleshy and edible |
2. | drupe and mesocarp is fibrous |
3. | berry and mesocarp is fleshy and edible |
4. | berry and mesocarp is fibrous |
Monocot root anatomy is different from the anatomy of dicot root in all the following aspects except:
1. More developed pith
2. Polyarch vascular bundles
3. Absence of secondary growth
4. Presence of multicellular root hairs
Identify the incorrect statement:
1. | The nuclear membrane and nucleolus reappear during Telophase I |
2. | The nuclear membrane disappears by the end of Prophase II |
3. | DNA replicates during interkinesis between meiosis I and meiosis II |
4. | Chromosomes do not reach the extremely extended state of interphase nucleus |
At which stage of mitosis are chromosomes usually photographed in the preparation of a karyotype?
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
Yeast is unique amongst the members of Kingdom Fungi because it:
1. reproduces by ascospores
2. is unicellular
3. does not have a chitinous cell wall
4. does not have a sexual mode of reproduction
What is incorrect regarding bryophytes in general?
1. Sex organs are multicellular
2. Main plant body is haploid
3. Sporophyte is free living and photosynthetic
4. Zygotes do not undergo reduction division immediately
The currently accepted definition of biological species was pioneered by:
1. | John Ray | 2. | G. G. Simpson |
3. | Ernst Mayr | 4. | Ernst Haeckel |
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
1. | Monoecious plant bearing unisexual flowers |
2. | Dioecious plant bearing only male or female flowers |
3. | Monoecious plant with bisexual flowers |
4. | Dioecious plant with bisexual flowers |
The incorrect statement with regard to Haemophiliais :
1. It is a recessive disease
2. It is a dominant disease
3. A single protein involved in the clotting of blood is affected
4. It is a sex-linked disease
Non- albuminous seed is produced in:
1. Maize
2. Castor
3. Wheat
4. Pea
A gene encoding for a polypeptide of 50 amino acids gets mutated at 25 codons UAU becoming UAA. The result would be:
1. | Polypeptide of 24 amino acid |
2. | Two polypeptides one with 24 amino acids and the second with 25 amino acids |
3. | A polypeptide with 49 amino acid |
4. | A polypeptide of 25 amino acids |
Select the correct option:
The direction of RNA synthesis |
The direction of reading of the template DNA strand |
|
1. |
5' - 3' |
3' - 5' |
2. |
3' - 5' |
5' - 3' |
3. |
5' - 3' |
5' - 3' |
4. |
3' - 5' |
3' - 5' |
Theoretically, what can be the maximum number of alleles a particular gene can have?
1. | 1 | 2. | 2 |
3. | 3 | 4. | Any number |
The units of inheritance according to Mendel were ‘factors’. Today these factors are known as:
1. | Gametes | 2. | DNA |
3. | Genes | 4. | RNA |
A test cross is done to find out:
1. | Fitness of an organism |
2. | Genotype of a plant expressing dominant phenotype |
3. | The suitable parents for a Mendelian Cross |
4. | The hidden genotypic ratio of F2 phenotypes |
The backbone of a polynucleotide chain is made of:
1. | Sugar and nitrogenous bases |
2. | Phosphate and nitrogenous bases |
3. | Sugar and phosphate |
4. | Sugar, phosphate, and nitrogenous bases |
When the embryosac develops from a single functional megaspore [the other three get generate], it is called as:
1. | Monosporic | 2. | Bisporic |
3. | Trisporic | 4. | Tetrasporic |
The mRNA codon GUG codes for:
1. | Valine | 2. | Glutamic acid |
3. | Tryptophan | 4. | Formylated methionine |
Which of the following alcoholic drinks are produced without distillation?
1. Whiskey and Brandy
2. Brandy and Rum
3. Wine and Beer
4. Wine and Brandy
Match the following columns and select the correct option:-
Column - I |
Column -II |
||
a) |
Dragonflies |
(i) |
Biocontrol agents of several plant pathogens |
b) |
Bacillus thuringiensis |
(ii) |
Get rid of mosquitoes |
c) |
Glomus |
(iii) |
Narrow spectrum insecticidal applications |
d) |
Baculoviruses |
(iv) |
Biocontrol agents of lepidopteran plant pests |
(v) |
Absorb phosphorus from soil |
(1) (a)-(iii), (b)-(v), (c)-(iv), (d)-(i)
(2) (a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
(3) (a)-(ii), (b)-(iii), (c)-(iv), (d)-(v)
(4) (a)-(ii), (b)-(iv), (c)-(v), (d)-(iii)
Which type of association is found between entomophilous flower and pollinating agent?
1. | Mutualism | 2. | Commensalism |
3. | Cooperation | 4. | Co-evolution |
The amount of carbon dioxide in the atmosphere is regulated mainly by:
1. the atmosphere itself
2. human activities
3. decomposition by microbes
4. the oceanic reservoir
Cryopreservation of gametes of threatened species in viable and fertile condition can be referred to as :
1. Advanced ex-situ conservation of biodiversity
2. In situ conservation by sacred groves
3. In situ cryo-conservation of biodiversity
4. In situ conservation of biodiversity
Chipko movement was launched for the protection of
1. Wet Lands
2. Grasslands
3. Forests
4. Livestock
The group most profoundly affected by global warming normally is:
1. | Plants | 2. | Insects |
3. | Birds | 4. | Mammals |
The two subunits of ribosomes remain united at a critical ion level of
1. Magnesium
2. Calcium
3. Copper
4. Manganese
A bacterium divides every 35 minutes. If a culture containing 105 cells per mL is grown for 175 minutes, what will be the cell concentration per mL after 175 minutes ?
1. 175 × 105 cells
2. 85 × 105 cells
3. 35 × 105 cells
4. 32 × 105 cells
A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the above situation is:
1. | Plant is dioecious and bears only pistillate flowers. |
2. | Plant is dioecious and bears both pistillate and staminate flowers. |
3. | Plant is monoecious. |
4. | Plant is dioecious and bears only staminate flowers. |
Cri-du-chat syndrome in humans is caused by
1. Trisomy of 21st chromosome
2. Loss of half of short arm of chromosome 5
3. Loss of half of long arm of chromosome 5
4. Fertilization of an XX egg by a normal Y- bearing sperm.
What would be the number of chromosomes in the cells of aleurone layer in plant species that have 8 chromosomes in their synergids?
1. | 8 | 2. | 16 |
3. | 24 | 4. | 32 |
In Griffith's experiment, which of the following bacterial strains was capable of causing pneumonia in mice?
1. | Live R |
2. | Bacteria strain with polysaccharide coat |
3. | Heat Killed S |
4. | Live R with capsule and Heat Killed S |
Which enzyme polymerizes RNA with defined sequences in a template independent manner?
1. | Peptidyl transferase |
2. | RNA polymerase |
3. | Reverse transcriptase |
4. | Polynucleotide phosphorylase |
Today, all our major food crops are derived from:
1. Wild varieties
2. Domesticated varieties
3. Genetically modified varieties
4. Plant tissue culture
A reproductive strategy that involves the development of a female (rarely a male) gamete (sex cell) without fertilization is called:
1. | Parthenogenesis | 2. | Parthenocarpy |
3. | Panmixis | 4. | Amphimixis |
Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups.
1. A person will have only two of the 3 alleles.
2. When IA and IB are present together, they express same type of sugar.
3. Allele 'i' does not produce any sugar.
4. The gene (I) has three alleles.
Which of the following is not a character of deuterostomes?
1. | Radial cleavage |
2. | Schizocoelous coelom |
3. | Indeterminate cleavage |
4. | Blastopore forms anus |
Which one of the following pairs is the matching pair of the part and the hormone it secretes?
1. Anterior pituitary - Thyroxine
2. Alpha cells of pancreas - Glucagon
3. Thyroid - Epinephrine
4. Stomach epithelium - Secretin
Which one of the following statements is correct with respect to kidney function regulation?
1. Exposure to cold temperature stimulates ADH release
2. An increase in glomerular blood flow stimulates the formation of angiotensin II
3. During summer when the body loses a lot of water by evaporation, the release of ADH is suppressed
4. When someone drinks a lot of water, ADH release is suppressed
Which of the following process of urine formation takes place all along the renal tubule and collecting duct?
1. Ultrafiltration and tubular reabsorption
2. Ultrafiltration and tubular secretion
3. Tubular reabsorption and secretion
4. Anti-current mechanism and reabsorption
One common example of simplex reflex is
1. tying your shoe laces while talking to another person and not looking at them
2. watering of mouth at the sight of a favourite food
3. climbing up a stairs in dark without stumbling
4. closing of eyes when strong light is flashed across them.
Excessive stimulation of vagus nerve in humans may lead to:
1. hoarse voice
2. peptic ulcers
3. efficient digestion of proteins
4. irregular contractions of diaphragm.
Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs
1. as bicarbonate ions
2. in the form of dissolved gas molecules
3. by binding to RBC
4. as carbamino-haemoglobin
Artificial insemination means:
1. | transfer of sperms of a healthy donor to a test tube containing ova |
2. | transfer of sperms of husband to a test tube containing ova |
3. | artificial introduction of sperms of a healthy donor into the vagina |
4. | introduction of sperms of healthy donor directly into the ovary |
DNA is not present in
1. Ribosomes
2. Nucleus
3. Mitochondria
4. Chloroplast
Which of the following is correct regarding cockroach ?
1. Malpighian tubules are excretory organs projecting out from the colon
2. Oxygen is transported by haemoglobin in blood
3. Nitrogenous excretory product is urea
4. The food is ground by mandibles and gizzard
Given below are types of cells present in some animals. Each one is specialized to perform a single specific
function expect
1. Choanocytes
2. Interstitial cells
3. Gastrodermal cells
4. Nematocytes
Which one of the following contains the largest quantity of extracellular material?
1. Myelinated nerve fibres
2. Striated muscle
3. Areolar tissue
4. Stratified epithelium
Setae help in locomotion in earthworm but not uniformly present in all the segments. Select among the following that represents setae.
1. 1st segment
2. Last segment
3. Clitella segment
4. 20th -22nd segment
Pathophysiology is the:
1. Study of physiology of pathogen
2. Study of normal physiology of the host
3. Study of altered physiology of the host
4. None of the above
Transplantation of tissues / organs fails often due to non-acceptance by the patient's body. Which type of immune –response is responsible for such rejection
1. Autoimmune response
2. Cell- mediated immune response
3. Hormonal immune response
4. Physiological immune response
The crops engineered for glyphosate are resistant/tolerant to:
1. Bacteria
2. Insects
3. Herbicides
4. Fungi
Histamine in the blood is released by:
1. | Mast cells | 2. | Macrophages |
3. | Fibroblasts | 4. | Basophils |
Which of the following cannot be used as a vector in rDNA technology?
1. | Plasmid | 2. | Phage DNA |
3. | Bacterium | 4. | YAC |
Secretin and cholecystokinin are digestive hormones. They are secreted in
1. | Oesophagus | 2. | Ileum |
3. | Duodenum | 4. | Pyloric stomach |
The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will be grafted at the site of
1. Purkinje system
2. Sinoatrial node
3. Atrioventricular node
4. Atrioventricular bundle
A glycosidic bond connects :
1. two monosaccharides
2. two amino acids
3. two fatty acids
4. a fatty acid and a glycerol
An acromion process is characteristically found in the
1. Skull of frog
2. Sperm of mammals
3. Pelvic girdle of mammals
4. Pectoral girdle of mammals
The functions of glucagon do not include:
1. Glycogenolysis
2. Gluconeogenesis
3. Increased cellular glucose uptake
4. Decreased cellular glucose utilization
In jaundice, skin and eyes turn yellow due to the deposition of:
1. Bile salts
2. Carotenoids
3. Xanthophylls
4. Bile pigments
For normal fertility, what percent of the sperm in ejaculate must exhibit normal morphology?
1. | 20 | 2. | 30 |
3. | 40 | 4. | 60 |
Fertilization occurs at:
1. Infundibulum of the fallopian tube
2. Ampullary – isthmic junction of the fallopian tube
3. Fundus of the uterus
4. Body of the uterus
A canal called the cerebral aqueduct passes through the:
1. Cerebral hemispheres | 2. Diencephalon |
3. Mid brain | 4. Hind brain |
The inability to conceive or produce children even after ____ years of unprotected sexual co-habitation is called infertility.
1. | 1 | 2. | 2 |
3. | 3 | 4. | 4 |
What is true for mechanism of hearing in humans?
1. Transmission of vibration by stapes to oval window → Waves in lymphs → Ripple in tectorial membrane → Hair cells bend against basilar membrane → Nerve impulse generated in afferent neurons
2. Transmission of vibration by malleus to oval window → Waves in lymphs → Ripple in basilar membrane → Hair cells bend against tectorial membrane → Nerve impulse generated in afferent neurons
3. Transmission of vibration by stapes to oval window → Waves in lymphs → Ripple in basilar membrane → Hair cells bend against tectorial membrane → Nerve impulse generated in afferent neurons
4. Transmission of vibration by stapes to oval window → Waves in lymphs → Ripple in basilar membrane → Hair cells bend against reisnner’s membrane → Nerve impulse generated in efferent neurons
All vertebrates posses a:
1. muscular chambered heart | 2. renal portal system |
3. nucleated RBC | 4. double circulation |
Which of the following would normally be highest in normal resting physiological conditions?
1. Total lung capacity
2. Minute ventilation
3. Vital capacity
4. Functional residual capacity
The glomerular filtration rate is most affected by:
1. blood osmotic pressure
2. capsular osmotic pressure
3. capsular hydrostatic pressure
4. net filtration pressure
As the distance from Z line to Z line decreases, which bands shorten in a sarcomere?
1. | the I band and H band | 2. | the I band and A band |
3. | the A band and H band | 4. | all bands shorten |
Identify the wrong statement with regards to restriction enzyme
1. They cut the strength at palindromic sites.
2. They are useful in genetic engineering.
3. Sticky ends can be joined by using DNA ligases.
4. Each restriction enzyme functions by inspecting the length of a DNA sequence.
Match the following columns and select the correct option :
Column - I Column - II
(a) Ovary (i) Human chorionic Gonadotropin
(b) Placenta (ii) Estrogen & Progesterone
(c) Corpus luteum (iii) Androgens
(d) Leydig cells (iv) Progesterone only
(1) (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
(2) (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
(3) (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
(4) (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
Myelin sheath is produced by
1. Schwann cells and Oligodendrocytes
2. Astrocytes and Schwann cells
3. Oligodendrocytes and Osteoclasts
4. Osteoclasts and Astrocytes
The contractile protein of skeletal muscle involving ATPase activity is:
1. tropomyosin
2. myosin
3. α-actinin
4. troponin
'Bundle of His' is a part of which one of the following organs in humans?
1. Heart
2. Kidney
3. Pancreas
4. Brain
How many sperms are formed from a secondary spermatocyte?
1. | 4 | 2. | 8 |
3. | 2 | 4. | 1 |
The H-Zone in the skeletal muscle fibre is due to
1. the central gap between actin filaments extending through myosin filaments in the A-band
2. extension of myosin filaments in the central portion of the A-band
3. the absence of myofibrils in the central portion of A-band
4. the central gap between myosin filaments in the A-band
Cohen and Boyer constructed one of the first genetically engineered chimeras, pSC101. They introduced in this plasmid the gene of Xenopus laevis that coded for:
1. | cytochrome c | 2. | haemoglobin |
3. | keratin | 4. | rRNA |
Look at the graph given below. The reaction rate, of the reaction, can be increased beyond point C by:
1. increasing the amount of substrate
2. adding more water
3. increasing the temperature
4. decreasing enzyme concentration
Haemozoin is a:
1. precursor of hemoglobin
2. toxin released from Streptococcus infected cells
3. toxin released from Plasmodium infected cells
4. toxin released from Haemophilus infected cells
Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?
1. | Overproduction, variations, constancy of population size, natural selection |
2. | Variations, constancy of population size, overproduction, natural selection |
3. | Overproduction, constancy of population size, variations, natural selections |
4. | Variations, natural selection, overproduction, constancy of population size |
In genetic drift, the term “genetic bottleneck” means:
1. reduction in allele frequencies or richness
2. random change in allele frequency by chance alone
3. sudden increase in the number of individuals
4. reproductive isolation of the population
Penicillin used to be very effective against a large number of bacteria when introduced initially but now many bacteria have developed resistance to it. This is because:
1. penicillin causes gene mutations, some of which are beneficial.
2. previously resistant forms survived and reproduced better than non-resistant forms.
3. the hospital environment inhibits competition among bacteria.
4. penicillin triggers the synthesis of resistant proteins.
Seaweeds existed probably around:
1. 500 mya
2. 350 mya
3. 320 mya
4. 300 mya
Each seminiferous tubule is lined by male germ cells called:
1. | Spermatogonia | 2. | Primary spermatocytes |
3. | Sertoli cells | 4. | Leydig cells |
Under normal physiological conditions, when compared to pulmonary circulation:
1. the amount of blood circulated in systemic circulation is more
2. the amount of blood circulated in systemic circulation is less
3. the pressure of blood circulated in systemic circulation is more
4. the pressure of blood circulated in systemic circulation is less
Inbreeding depression is -
(1) Reduced motility and immunity due to close inbreeding
(2) Decreased productivity due to mating of superior male and inferior female
(3) Decrease in body mass of progeny due to continued close inbreeding
(4) Reduced fertility and productivity due to continued close inbreeding