Root pressure develops due to
1. active absorption
2. low osmotic potential in soil
3. passive absorption
4. increase in transpiration
Consider the following:
I. Creation of pull for absorption and transport in plants
II. Supply of water for photosynthesis
III. Transport of minerals from leaves to all parts of a plant
IV. Cooling of leaf surface
V. Maintenance of shape and structure of plants by keeping the cells turgid
Functions of transpiration include:
1. All
2. All but III
3. All but V
4. All but III and IV
In which of the following, all three are macronutrients?
1. Iron, copper, molybdenum
2. Molybdenum, magnesium, manganese
3. Nitrogen, magnesium, phosphorus
4. Boron, zinc, manganese
-plants are photosynthetically more efficient than -plants because
1. compensation point is more.
2. generated during photorespiration is trapped and recycled through PEP carboxylase.
3. efflux is not prevented.
4. they have more chloroplasts.
What is true regarding PSI and PSII?
1. PS I works before PS II during the light reaction
2. A single chlorophyll a molecule makes the reaction center in both PS I and PS II
3. The reaction center of PS I is P680 and in PS II is P700
4. LHC is seen in PS I but not in PS II
In which one of the following processes is not released?
1. Aerobic respiration in plants
2. Aerobic respiration in animals
3. Alcoholic fermentation
4. Lactate fermentation
How many ATP molecules are directly synthesized in glycolytic pathway from one glucose molecule?
1. 2 | 2. 4 |
3. 6 | 4. 10 |
Which one of the following growth regulators is known as "stress hormone" ?
1. Abscisic acid
2. Ethylene
3.
4. lndole acetic acid
In mycorrhiza, the fungi help the plant in:
1. Synthesis of high energy carbohydrates
2. Absorption of essential nutrients from the soil
3. Nitrogen fixation
4. Biocontrol of pathogens
Khecheopalri lake in Sikkim is a:
1. Biosphere reserve
2. National park
3. Sacred lake
4. Inhibited area
Chromatophores take part in :
1. Growth
2. Movement
3. Respiration
4. Photosynthesis
Which of the following is not true of a eukaryotic cell?
1. It has 80S type of ribosome present in the mitochondria
2. It has 80S type of ribosome present in the cytoplasm
3. Mitochondria contain circular DNA
4. Membrane bound organelles are present
Which one of the following matches is correct?
1. | Alternaria | Sexual reproduction absent | Deuteromycetes |
2. | Mucor | Reproduction by Conjugation | Ascomycetes |
3. | Agaricus | Parasitic fungus | Basidiomycetes |
4. | Phytophthora | Aseptate mycelium | Basidiomycetes |
Which stages of cell division do the following figures A and B represent respectively?
1. Metaphase - Telophase
2. Telophase - Metaphase
3. Late anaphase – Prophase
4. Prophase – Anaphase
A lateral branch with short internodes and each node bearing a rosette of leaves and tufts of roots is found in:
1. Opuntia and Euphorbia | 2. Mint and Jasmine |
3. Pistia and Eichhornia | 4. Banana and Pineapple |
Pneumatophores are found in plants growing in:
1. Xeric conditions | 2. Swampy areas |
3. Hypersaline environments | 4. Permafrost conditions |
The ring arrangement of vascular bundles is a characteristic feature of:
1. | Monocot stem | 2. | Dicot stem |
3. | Monocot root | 4. | Dicot root |
The correct chronology of stages of Prophase I is:
1. Leptotene – Zygotene – Pachytene – Diplotene – Diakinesis
2. Leptotene – Pachytene – Zygotene – Diplotene – Diakinesis
3. Leptotene – Zygotene – Pachytene – Diakinesis – Diplotene
4. Zygotene – Leptotene – Pachytene – Diakinesis – Diplotene
The commercial production of citric acid is possible with the help of:
1. Xanthomanascitri
2. Claviceps purpura
3. Trichodermaharzianum
4. Aspergillus niger
Identify the incorrect statement regarding algae:
1. Algae contain chlorophyll
2. Algae are autotrophic
3. Body of an alga is composed of pseudoparenchyma and hyphae
4. Cell wall of an alga is composed of true cellulose.
Red algae photosynthesize at ocean depths greater than any other group of algae and hence can be found in deepest waters because they
1. contain a higher concentration of chlorophyll
2. have an extremely large surface area to capture the little amount of light that reaches them
3. contain the pigment phycoerythrin
4. periodically float to the surface and intercept light, then move back to the ocean floor
ICBN stands for:
1. Indian Council for Biological Nomenclature
2. International Code for Binomial Nomenclature
3. Indian Council for Binomial Nomenclature
4. International Code for Botanical Nomenclature
While planning for an artificial hybridization programme involving dioecious plants, which of the following steps would not be relevant?
1. Bagging of the female flower
2. Dusting of pollen on the stigma
3. Emasculation
4. Collection of pollen
A man whose father was colour blind marries a woman who had a colourblind mother and a normal father. What percentage of male children of this couple will be colour blind?
1. | 25% | 2. | 0% |
3. | 50% | 4. | 75% |
Endosperm is consumed by developing embryo in the seed of
1. Coconut
2. Pea
3. Maize
4. Castor
What does lac refer to in lac operon
1. Lactase
2. 1,00,000
3. Lac insect
4. Lactose
Satellite DNA is important because it:
1. | shows a high degree of polymorphism in the population and also the same degree of polymorphism in an individual, which is heritable from parents to children |
2. | does not code for proteins and is the same in all members of the population |
3. | codes for enzymes needed for DNA replication |
4. | codes for proteins needed in the cell cycle |
Genes that code for a pair of contrasting traits or slightly different forms of the same gene are known as:
1. | Alleles | 2. | Loci |
3. | Cistrons | 4. | Introns |
What can the possible blood groups of progeny whose father and mother are of A and B blood groups, respectively?
1. | A and B only | 2. | AB only |
3. | All except O | 4. | A, B, AB, and O |
During DNA packaging in eukaryotic cells, Non-Histone Chromosomal proteins:
1. | Are not required |
2. | Are required from the beginning to the end of the packaging |
3. | Are required only for earlier stages of packaging |
4. | Are required for a higher level of packaging |
Which of the following is/are a marine plant pollinated by water?
1. | Vallisneria | 2. | Hydrilla |
3. | Zostera | 4. | Both 1 and 2 |
Identify the incorrect statement:
1. | The DNA of the bacteriophage ϕ X 174 has 5386 nucleotides. |
2. | Bacteriophage lambda DNA has 48502 base pairs. |
3. | The DNA of Escherichia coli has 4.6 X 103 base pairs. |
4. | Haploid content of human DNA is 3.3 X 109 base pairs. |
A source of a ‘clot buster’ enzyme used in patients of CAD is the bacterium:
1. | Staphylococcus aureus | 2. | Streptomyces griseus |
3. | Pseudomonas putida | 4. | Streptococcus pyogenes |
Identify the human cell for which the interphase period lasts the entire life of a person.
1. | Hepatocyte | 2. | Bone marrow stem cells |
3. | Epidermal cell | 4. | Neuron |
Which of the following is put into Anaerobic sludge digester for further sewage treatment ?
(1) Floating debris
(2) Effluents of primary treatmet
(3) Activated sludge
(4) Primary sludge
The maximum growth rate occurs in
1. Senescent phase.
2. Lag phase.
3. Exponential phase.
4. Stationary phase.
A biologist studied the population of rats in a barn. He found that the average natality was 250, average
mortality 240, immigration 20, and emigration 30. The net increase in population is:
1. | 10 | 2. | 15 |
3. | 5 | 4. | zero |
Regarding phosphorus cycle:
I: | There is no respiratory release of phosphorus into atmosphere |
II: | Atmospheric inputs of phosphorus through rainfall of phosphorus is small |
1. Only I is true.
2. Only II is true.
3. Both I and II are true.
4. Both I and II are false.
Which of the following is the most important cause of animals and plants being driven to extinction?
1. Co - extinctions
2. Over - exploitation
3. Alien species invasion
4. Habitat loss and fragmentation
Eutrophication is often seen in
1. Deserts
2. Fresh water lakes
3. Ocean
4. Mountains
Which of the following commits the industrialised nations to reduce greenhouse gas emissions?
1. Montreal protocol
2. Kyoto protocol
3. UNECD earth summit
4. Alma Atta conference
In germinating seeds, fatty acids are degraded exclusively in the
1. Peroxisomes
2. Glyoxysomes
3. Mitochondria
4. Proplastids
Identify the stage of mitosis shown in the given diagram:
1. Prophase | 2. Metaphase |
3. Anaphase | 4. Telophase |
From among the sets of terms given below, identify those that are associated with the gynoecium.
1. | Stigma, ovule, embryo sac, placenta |
2. | Thalamus, pistil, style, ovule |
3. | Ovule, ovary, embryo sac, tapetum |
4. | Ovule, stamen, ovary, embryo sac |
Telomeres with repetitive DNA sequences
1. Act as replicons
2. Are transcription initiators
3. Help in chromosome pairing
4. Prevent chromosome loss.
Which one of the following may require pollinators, but is genetically similar to autogamy?
1. Xenogamy
2. Apogamy
3. Cleistogamy
4. Geitonogamy
The base pairing in a double stranded DNA is correctly described as:
1. | Similar | 2. | Identical |
3. | Complementary | 4. | Synergistic |
The amino acid acceptor arm of the tRNA is at its:
1. | DHU loop | 2. | TψC loop |
3. | 5’ end | 4. | 3’ end |
Resistance to the yellow mosaic virus in bhindi (Abelmoschus Esculentus) was possible by:
1. | Conventional hybridization | 2. | Mutations |
3. | Genetic engineering | 4. | Tissue culture |
When compared to external fertilization, in cases where internal fertilization takes place in sexually reproducing organisms:
1. | The progeny are afforded better protection |
2. | The number of male gametes are highly reduced while the number of female gametes is increased |
3. | Male gamete is non-motile and the female gamete has to reach it |
4. | In seed plants the non-motile male gametes are carried to the female gamete by pollen tubes |
I. | Only I and II are correct |
II. | Only III and IV are correct |
III. | Only I and IV are correct |
IV. | Only II and III are correct |
Hypersecretion of growth hormone in adults does not cause further increase in height because
1. growth hormone becomes inactive in adults
2. epiphyseal plates close after adolescence
3. bones loose their sensitivity to growth hormone in adults
4. muscle fibres do not grow in size after birth
Uric acid is the chief nitrogenous component of the excretory products of
1. man
2. earthworm
3. cockroach
4. frog
A large proportion of oxygen is left unsused in the human blood even after its uptake by the body tissues. This
1. raises the of blood to 75 mm of Hg
2. is enough to keep oxyhaemoglobin
3. helps in releasing more to the epithelial tissues
4. acts as a reserve during muscular exercise
Gastric juice of infants contains?
1. maltase, pepsinogen, rennin
2. nuclease, pepsinogen, lipase
3. pepsinogen, lipase, rennin
4. amylase, rennin, pepsinogen
In vitro fertilization is a technique that involves transfer of which one of the following into the fallopian tube?
1. Embryo only, up to 8 cell stage
2. Either zygote or early embryo upto 8 cell stage
3. Embryo of 32 cell stage
4. Zygote only
Which one of the following is not applicable to RNA?
1. 5’ phosphoryl and 3’ hydroxyl ends
2. Heterocyclic nitrogenous bases
3. Chargaff’s rule
4. Complementary base pairing
Select the Taxon mentioned that represents both marine and fresh water species–
1. Echionoderms
2. Ctenophroa
3. Cephalocoradata
4.Cnidaria
In some Bilateria, the body is of many segments that show serial repetition of parts. Such segments are called as:
1. Myotomes
2. Metameres
3. Proglottides
4. Comb plates
Birds and mammals share one of the following characteristics as a common feature.
1. Pigmented skin
2. Alimentary canal with some modification
3. Viviparity
4. Warm blooded nature
Which one of the following mammalian cells are not capable of metabolizing (aerobically) glucose to carbon dioxide?
1. White blood cells | 2. Unstriated muscle cells |
3. Liver cells | 4. Red blood cells |
Match the followings and choose the correct answer:
Column I | Column II | ||
(a) | Hermaphrodite | (i) | Produces blood cells and haemoglobin |
(b) | Directed development | (ii) | Testis and ovary in the same animal |
(c) | Chemoreceptor | (iii) | Larval form absent |
(d) | Blood gland in earthworm | (iv) | Sense of chemical substances |
Options:
Options: | (a) | (b) | (c) | (d) |
1. | (ii) | (iii) | (iv) | (i) |
2. | (iii) | (ii) | (iv) | (i) |
3. | (i) | (iii) | (ii) | (iv) |
4. | (ii) | (iv) | (iii) | (i) |
In RNAi, genes are silenced using:
1. | ss DNA | 2. | ds DNA |
3. | ds RNA | 4. | ss RNA |
The introduction of t-DNA into plants involves:
1. Altering the pH of the soil, then heat shocking the plants
2. Exposing the plants to cold for a brief period
3. Allowing the plant roots to stand in water
4. Infection of the plant by Agrobacterium tumefaciens
Secondary lymphoid organs:
1. | Are those where immature lymphocytes differentiate |
2. | Provide a site of interaction between lymphocytes and antigens |
3. | Are formed after birth |
4. | Are bone marrow and MALT |
pBR322 does not contain the site for:
1. | Pvu I | 2. | BamH I |
3. | Sma I | 4. | EcoR I |
Which one of the following is not a second messenger in hormone action?
1. cGMP
2. Calcium
3. Sodium
4. cAMP
Which type of white blood cells are concerned with the release of histamine and the natural anticoagulant heparin?
1. Monocytes
2. Neutrophils
3. Basophils
4. Eosinophils
Which of the following is an essential amino acid?
1. Phenylalanine
2. Aspartic acid
3. Glutamic acid
4. Serine
One of the example of the action of the autonomous nervous system is
1. Knee-jerk response.
2. Pupillary reflex.
3. Peristalsis of the intestines.
4. Swallowing of food.
In the human body, which one of the following is anatomically correct?
1. Cranial nerve - 10 pairs
2. Floating ribs - 2 pairs
3. Collar bones - 3 pairs
4. Salivary glands - 1 pair
Uricotelism is found in
1. Fishes, and fresh protozoans.
2. Birds, reptiles and insects
3. Frogs, and toads
4. Mammals, and birds
Which of the following cannot be regarded as a main function of cortisol?
1. Increased blood sugar by gluconeogenesis
2. Lipolysis, proteolysis and decreased uptake of amino acids by body cells
3. Regulation of water and minerals in the body
4. Suppression of inflammation and immunity
Marasmus is not characterized by:
1. onset age less than one year
2. simultaneous deficiency of proteins and calories
3. impairment of mental faculties
4. extensive edema and swelling of body parts
The correct sequence of mammalian mammary gland ducts beginning from the alveoli would be:
1. | Mammary tubules → Mammary ducts → Mammary ampulla → Lactiferous ducts |
2. | Lactiferous ducts → Mammary ducts → Mammary ampulla → Mammary tubules |
3. | Lactiferous ducts → Mammary ampulla → Mammary ducts → Mammary tubules |
4. | Mammary tubules → Mammary ampulla → Mammary ducts → Lactiferous ducts |
At the birth of the female child, the follicles in her ovaries contain:
1. | Primary oocytes that have been arrested at the S phase of the cell cycle |
2. | Primary oocytes that have been arrested at prophase I of meiosis I |
3. | Secondary oocytes that have been arrested prophase I of meiosis I |
4. | Secondary oocytes that have been arrested at metaphase II of meiosis II |
Which of the following is not true about “Saheli”?
1. | It is an oral contraceptive pill |
2. | The basic preparation is steroidal |
3. | It is a ‘once in a week’ pill |
4. | It has very few side effects and has a high contraceptive value |
Gustatory receptors are meant for:
1. Taste | 2. Smell |
3. Vibration | 4. Temperature |
The resting axonal membrane is impermeable/nearly impermeable to:
I. Sodium ions
II. Potassium ions
III. Negatively charged proteins
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II and III |
Another name for lymph would be:
1. Extra-cellular fluid | 2. Tissue fluid |
3. Plasma ultrafiltrate | 4. Serous fluid |
All the following lead to a right shift of oxy-hemoglobin dissociation curve except:
1. Increase in pH
2. Increase in temperature
3. Increase in partial pressure of carbon dioxide
4. Presence of 2,3-DPG
The micturition reflex is coordinated at the level of:
1. Sacral spinal cord
2. Pontine micturition center
3. Hypothalamus
4. Cerebrum
All the following regarding red muscle fibers are true except:
1. They are adapted for slow and sustained activity
2. They have a high content of myoglobin
3. They are rich in mitochondria
4. They depend on anaerobic process for energy
The specific palindromic sequence which is recognized by EcoRI is :
1. 5' -GGAACC-3'
3'-CCTTGG-5'
2. 5'-CTTAAG-3'
3'-GAATTC-5'
3. 5'-GGATCC-3'
3'-CCTAGG-5'
4. 5'-GAATTC-3'
3'-CTTAAG-5'
Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle?
1. High concentration of Progesterone
2. Low concentration of LH
3. Low concentration of FSH
4. High concentration of Estrogen
The yellowish fluid "colostrum" secreted by mammary glands of the mother during the initial days of lactation has abundant antibodies (IgA) to protect the infant. This type of immunity is called as :
(1) Passive immunity
(2) Active immunity
(3) Acquired immunity
(4) Autoimmunity
Destruction of the anterior horn cells of the spinal cord would result in loss of
1. sensory impulses
2. voluntary motor impulses
3. commissural impulses
4. integrating impulses
Given diagram shows bone of the left human hind limb as seen from front. It has certain mistakes in labeling. Two of the wrongly labelled bones are
1. | tibia and tarsals | 2. | femur and fibula |
3. | fibula and phalanges | 4. | tarsals and femur |
The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for:
1. | escaping any possible compression by the visceral organs |
2. | providing more space for the growth of epididymis |
3. | providing a secondary sexual feature for exhibiting the male sex |
4. | maintaining the scrotal temperature lower than the internal body temperature |
A human RBC is placed in 1.5% salt solution. It will
1. swell up
2. shrink
3. remain unaffected
4. burst
The 'cells of Rauber' are
1. secretory cells of endometrium in uterus
2. inner cell mass of blastocoel
3. outer cells of trophoblast in contact with uterine wall
4. cells of trophoblast, in contact with inner cell mass of blastocyst.
Which of the following restriction enzymes would not produce “sticky ends”?
1. | EcoRI | 2. | HindII |
3. | BamHI | 4. | HindIII |
The graph shown below shows the effect of a certain factor on the rate of a reaction catalyzed by an enzyme. The X-axis would show the said factor and that will be:
1. substrate concentration | 2. pH |
3. enzyme concentration | 4. temperature |
In recent years, DNA sequences (nucleotide sequence) of mtDNA and Y chromosomes were considered for the study of human evolution, because
1. they are small, and therefore, easy to study
2. they are uniparental in origin and do not take part in recombination
3. their structure is known in greater detail.
4. they can be studied from the samples of fossil remains.
Which of the following does not define health in the WHO definition of health?
1. | Physical well being | 2. | Mental well being |
3. | Social well being | 4. | Absence of disease |
The persistence of different genotypes in a population through heterozygote superiority is an example of:
1. | mutation | 2. | parallel evolution |
3. | polymorphism | 4. | adaptive radiation |
If you visit Africa you will find an amazing variety of species of living organisms. But you will also notice that different parts of the continents have different biodiversity. This is because the different areas of Africa will have different:
1. | evolutionary mechanisms | 2. | ancestors |
3. | environments | 4. | evolutionary times |
Which of the following is not a finding observed by Darwin, when he landed on the Galapagos Islands?
1. | Woodpeckers were absent on the islands |
2. | The island species resembled the mainland species |
3. | Islands contain more different species of finches than the mainland |
4. | The corresponding size of the species was smaller on the islands than the species on the mainland |
When the heart muscle is suddenly damaged by an inadequate blood supply, the condition is called as:
1. | Heart failure | 2. | Heart block |
3. | Heart attack | 4. | Cardiac arrest |
ATPase activity is found in:
1. | Myosin head | 2. | Myosin tail |
3. | G-Actin | 4. | Troponin |
Select the incorrect statement regarding inbreeding:
1. Inbreeding helps in elimination of deleterious alleles from the population
2. Inbreeding is necessary to evolve a pure-line in any animal
3. Continued inbreeding reduces fertility and leads to inbreeding depression.
4. Inbreeding depression cannot be overcome by Out-crossing.