Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?
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N2O, NO, and NO2 are common pollutants from combustion and soil processes. N2O5 is not a primary pollutant emitted into the atmosphere as common as the others.
The experimental proof for semiconservative replication of DNA was first shown in a
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Meselson and Stahl performed their experiment on Escherichia coli (a bacterium).
Select the correct statement:
a.
Franklin Stahl coined the term ‘‘linkage’’.
b.
Punnett square was developed by a British scientist.
Correct Answer
c.
Spliceosomes take part in translation.
d.
Transduction was discovered by S. Altman.
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Reginald C. Punnett was a British geneticist who created the Punnett square.
Offsets are produced by
b.
Mitotic divisions
Correct Answer
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Offsets are a form of vegetative reproduction, which occurs through mitosis.
Which of the following pairs is wrongly matched?
a.
Starch synthesis in pea : Multiple alleles
b.
ABO blood grouping : Co-dominance
Correct Answer
c.
XO type sex determination : Grasshopper
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ABO blood grouping shows both multiple alleles and codominance, but the primary classification for the gene 'I' usually centers on multiple alleles. However, strictly speaking, option (b) is the best fit for 'wrongly matched' if testing standard syllabus pairings where ABO represents 'Multiple Allelism' and co-dominance is often paired separately.
Which of the following flowers only once in its life-time?
a.
Bamboo species
Correct Answer
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Bamboo species are monocarpic plants that flower only once in their lifetime.
Select the correct match:
a.
Alec Jeffreys – Streptococcus pneumoniae
b.
Alfred Hershey and Martha Chase – TMV
c.
Matthew Meselson and F. Stahl – Pisum sativum
d.
Francois Jacob and Jacques Monod – Lac operon
Correct Answer
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Jacob and Monod proposed the Lac operon model.
Which of the following has proved helpful in preserving pollen as fossils?
d.
Sporopollenin
Correct Answer
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Sporopollenin is one of the most resistant organic materials known, allowing pollen to be well-preserved as fossils.
Stomatal movement is not affected by
c.
O2 concentration
Correct Answer
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Stomatal aperture is significantly affected by light, temperature, and internal CO2 concentration, but O2 concentration has negligible effect.
The stage during which separation of the paired homologous chromosomes begins is
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During the diplotene stage, the dissolution of the synaptonemal complex occurs and the homologous chromosomes start to separate.
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Which of the following is not a product of light reaction of photosynthesis?
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Stomata in grass leaf are
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Which among the following is not a prokaryote?
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Which of the following is true for nucleolus?
a.
Larger nucleoli are present in dividing cells.
b.
It is a membrane-bound structure.
c.
It takes part in spindle formation.
d.
It is a site for active ribosomal RNA synthesis.
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The Golgi complex participates in
b.
Formation of secretory vesicles
c.
Respiration in bacteria
d.
Activation of amino acid
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In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen?
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Which of the following is a secondary pollutant?
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Niche is
a.
all the biological factors in the organism’s environment
b.
the physical space where an organism lives
c.
the range of temperature that the organism needs to live
d.
the functional role played by the organism where it lives
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Niche is
a.
all the biological factors in the organism’s environment
b.
the physical space where an organism lives
c.
the range of temperature that the organism needs to live
d.
the functional role played by the organism where it lives
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Natality refers to
c.
Number of individuals leaving the habitat
d.
Number of individuals entering a habitat
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Natality refers to
c.
Number of individuals leaving the habitat
d.
Number of individuals entering a habitat
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What type of ecological pyramid would be obtained with the following data? Secondary consumer: 120 g, Primary consumer: 60 g, Primary producer: 10 g
a.
Inverted pyramid of biomass
c.
Upright pyramid of numbers
d.
Upright pyramid of biomass
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What type of ecological pyramid would be obtained with the following data? Secondary consumer : 120 g, Primary consumer : 60 g, Primary producer : 10 g
a.
Inverted pyramid of biomass
c.
Upright pyramid of numbers
d.
Upright pyramid of biomass
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World Ozone Day is celebrated on
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World Ozone Day is celebrated on
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Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes?
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Which of the following is commonly used as a vector for introducing a DNA fragment in human lymphocytes?
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In India, the organisation responsible for assessing the safety of introducing genetically modified organisms for public use is
a.
Indian Council of Medical Research (ICMR)
b.
Council for Scientific and Industrial Research (CSIR)
c.
Research Committee on Genetic Manipulation (RCGM)
d.
Genetic Engineering Appraisal Committee (GEAC)
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A ‘new’ variety of rice was patented by a foreign company, though such varieties have been present in India for a long time. This is related to
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Select the correct match :
a.
Ribozyme – Nucleic acid
b.
F2 × Recessive parent – Dihybrid cross
c.
T.H. Morgan – Transduction
d.
G. Mendel – Transformation
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Use of bioresources by multinational companies and organisations without authorisation from the concerned country and its people is called
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The correct order of steps in Polymerase Chain Reaction (PCR) is
a.
Extension, Denaturation, Annealing
b.
Annealing, Extension, Denaturation
c.
Denaturation, Extension, Annealing
d.
Denaturation, Annealing, Extension
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Secondary xylem and phloem in dicot stem are produced by
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Pneumatophores occur in
b.
Free-floating hydrophytes
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Sweet potato is a modified
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Which of the following statements is correct?
a.
Ovules are not enclosed by ovary wall in gymnosperms.
b.
Selaginella is heterosporous, while Salvinia is homosporous.
c.
Horsetails are gymnosperms.
d.
Stems are usually unbranched in both Cycas and Cedrus.
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Select the wrong statement:
a.
Cell wall is present in members of Fungi and Plantae.
b.
Mushrooms belong to Basidiomycetes.
c.
Pseudopodia are locomotory and feeding structures in Sporozoans.
d.
Mitochondria are the powerhouse of the cell in all kingdoms except Monera.
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Casparian strips occur in
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Plants having little or no secondary growth are
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Which one is wrongly matched?
a.
Uniflagellate gametes – Polysiphonia
b.
Biflagellate zoospores – Brown algae
c.
Gemma cups – Marchantia
d.
Unicellular organism – Chlorella
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Match the items given in Column I with those in Column II and select the correct option given below:
a.
Herbarium - i. It is a place having a collection of preserved plants and animals. b. Key - ii. A list that enumerates methodically all the species found in an area with brief description aiding identification. c. Museum - iii. Is a place where dried and pressed plant specimens mounted on sheets are kept. d. Catalogue - iv. A booklet containing a list of characters and their alternates which are helpful in identification of various taxa.
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Winged pollen grains are present in
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Winged pollen grains are present in
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After karyogamy followed by meiosis, spores are produced exogenously in
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After karyogamy followed by meiosis, spores are produced exogenously in
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What is the role of NAD+ in cellular respiration?
a.
It functions as an enzyme.
b.
It functions as an electron carrier.
c.
It is a nucleotide source for ATP synthesis.
d.
It is the final electron acceptor for anaerobic respiration.
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What is the role of NAD+ in cellular respiration?
a.
It functions as an enzyme.
b.
It functions as an electron carrier.
c.
It is a nucleotide source for ATP synthesis.
d.
It is the final electron acceptor for anaerobic respiration.
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Oxygen is not produced during photosynthesis by
a.
Green sulphur bacteria
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Oxygen is not produced during photosynthesis by
a.
Green sulphur bacteria
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Pollen grains can be stored for several years in liquid nitrogen having a temperature of
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In which of the following forms is iron absorbed by plants?
d.
Both ferric and ferrous
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Double fertilization is
a.
Fusion of two male gametes of a pollen tube with two different eggs
b.
Fusion of one male gamete with two polar nuclei
c.
Fusion of two male gametes with one egg
d.
Syngamy and triple fusion
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Which of the following elements is responsible for maintaining turgor in cells?
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Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?
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Hormones secreted by the placenta to maintain pregnancy are
a.
hCG, hPL, progestogens, prolactin
b.
hCG, hPL, estrogens, relaxin, oxytocin
c.
hCG, hPL, progestogens, estrogens
d.
hCG, progestogens, estrogens, glucocorticoids
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The contraceptive ‘SAHELI’
a.
blocks estrogen receptors in the uterus, preventing eggs from getting implanted.
b.
increases the concentration of estrogen and prevents ovulation in females.
d.
is a post-coital contraceptive.
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The difference between spermiogenesis and spermiation is
a.
In spermiogenesis spermatids are formed, while in spermiation spermatozoa are formed.
b.
In spermiogenesis spermatozoa are formed, while in spermiation spermatids are formed.
c.
In spermiogenesis spermatozoa from sertoli cells are released into the cavity of seminiferous tubules, while in spermiation spermatozoa are formed.
d.
In spermiogenesis spermatozoa are formed, while in spermiation spermatozoa are released from sertoli cells into the cavity of seminiferous tubules.
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The amnion of mammalian embryo is derived from
c.
mesoderm and trophoblast
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In a growing population of a country,
a.
pre-reproductive individuals are more than the reproductive individuals.
b.
reproductive individuals are less than the post-reproductive individuals.
c.
reproductive and pre-reproductive individuals are equal in number.
d.
pre-reproductive individuals are less than the reproductive individuals.
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All of the following are included in ‘Ex-situ conservation’ except
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Which part of poppy plant is used to obtain the drug “Smack”?
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Match the items given in Column I with those in Column II and select the correct option given below:
a.
Eutrophication - Nutrient enrichment
b.
Sanitary landfill - Waste disposal
c.
Snow blindness - UV-B radiation
d.
Jhum cultivation - Deforestation
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Match the items given in Column I with those in Column II and select the correct option given below:
Column I: a. Eutrophication, b. Sanitary landfill, c. Snow blindness, d. Jhum cultivation
Column II: i. UV-B radiation, ii. Deforestation, iii. Nutrient enrichment, iv. Waste disposal
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Which one of the following population interactions is widely used in medical science for the production of antibiotics?
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Which one of the following population interactions is widely used in medical science for the production of antibiotics?
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Which of the following events does not occur in rough endoplasmic reticulum?
c.
Cleavage of signal peptide
d.
Phospholipid synthesis
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Which of the following events does not occur in rough endoplasmic reticulum?
b.
(2) Protein glycosylation
c.
(3) Cleavage of signal peptide
d.
(4) Phospholipid synthesis
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Which of these statements is incorrect?
a.
Enzymes of TCA cycle are present in mitochondrial matrix.
b.
Glycolysis occurs in cytosol.
c.
Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms.
d.
Oxidative phosphorylation takes place in outer mitochondrial membrane.
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Which of these statements is incorrect?
a.
(1) Enzymes of TCA cycle are present in mitochondrial matrix.
b.
(2) Glycolysis occurs in cytosol.
c.
(3) Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms.
d.
(4) Oxidative phosphorylation takes place in outer mitochondrial membrane.
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Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as
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Select the incorrect match:
a.
(1) Lampbrush – Diplotene bivalents
b.
(2) Allosomes – Sex chromosomes
c.
(3) Submetacentric – L-shaped chromosomes
d.
(4) Polytene – Oocytes of amphibians
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Nissl bodies are mainly composed of
a.
(1) Proteins and lipids
c.
(3) Nucleic acids and SER
d.
(4) Free ribosomes and RER
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Which of the following terms describe human dentition?
a.
(1) Thecodont, Diphyodont, Homodont
b.
(2) Thecodont, Diphyodont, Heterodont
c.
(3) Pleurodont, Monophyodont, Homodont
d.
(4) Pleurodont, Diphyodont, Heterodont
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Match the items given in Column I with those in Column II:
a. Glycosuria, b. Gout, c. Renal calculi, d. Glomerular nephritis
i. Accumulation of uric acid in joints, ii. Mass of crystallised salts within the kidney, iii. Inflammation in glomeruli, iv. Presence of glucose in urine
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Match the items given in Column I with those in Column II:
Column I (Function): a. Ultrafiltration, b. Concentration of urine, c. Transport of urine, d. Storage of urine
Column II (Part of Excretory System): i. Henle’s loop, ii. Ureter, iii. Urinary bladder, iv. Malpighian corpuscle, v. Proximal convoluted tubule
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The similarity of bone structure in the forelimbs of many vertebrates is an example of
c.
(3) Convergent evolution
d.
(4) Adaptive radiation
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Which of the following is not an autoimmune disease?
b.
(2) Rheumatoid arthritis
c.
(3) Alzheimer’s disease
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Among the following sets of examples for divergent evolution, select the incorrect option:
a.
(1) Forelimbs of man, bat and cheetah
b.
(2) Heart of bat, man and cheetah
c.
(3) Brain of bat, man and cheetah
d.
(4) Eye of octopus, bat and man
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Which of the following characteristics represent ‘Inheritance of blood groups’ in humans?
a. Dominance, b. Co-dominance, c. Multiple allele, d. Incomplete dominance, e. Polygenic inheritance
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In which disease does mosquito transmitted pathogen cause chronic inflammation of lymphatic vessels?
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Conversion of milk to curd improves its nutritional value by increasing the amount of
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Conversion of milk to curd improves its nutritional value by increasing the amount of
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Which of the following is an amino acid derived hormone?
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Which of the following is an amino acid derived hormone?
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Which of the following structures or regions is incorrectly paired with its function?
a.
(1) Medulla oblongata : controls respiration and cardiovascular reflexes.
b.
(2) Limbic system : consists of fibre tracts that interconnect different regions of brain; controls movement.
c.
(3) Hypothalamus : production of releasing hormones and regulation of temperature, hunger and thirst.
d.
(4) Corpus callosum : band of fibers connecting left and right cerebral hemispheres.
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Which of the following structures or regions is incorrectly paired with its function?
a.
Medulla oblongata : controls respiration and cardiovascular reflexes.
b.
Limbic system : consists of fibre tracts that interconnect different regions of brain; controls movement.
c.
Hypothalamus : production of releasing hormones and regulation of temperature, hunger and thirst.
d.
Corpus callosum : band of fibers connecting left and right cerebral hemispheres.
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Which of the following hormones can play a significant role in osteoporosis?
a.
(1) Aldosterone and Prolactin
b.
(2) Progesterone and Aldosterone
c.
(3) Estrogen and Parathyroid hormone
d.
(4) Parathyroid hormone and Prolactin
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Which of the following hormones can play a significant role in osteoporosis?
a.
Aldosterone and Prolactin
b.
Progesterone and Aldosterone
c.
Estrogen and Parathyroid hormone
d.
Parathyroid hormone and Prolactin
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The transparent lens in the human eye is held in its place by
a.
ligaments attached to the ciliary body
b.
ligaments attached to the iris
c.
smooth muscles attached to the iris
d.
smooth muscles attached to the ciliary body
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Which of the following animals does not undergo metamorphosis?
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Identify the vertebrate group of animals characterized by crop and gizzard in its digestive system.
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Which of the following organisms are known as chief producers in the oceans?
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Which one of these animals is not a homeotherm?
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Ciliates differ from all other protozoans in
a.
using flagella for locomotion
b.
having a contractile vacuole for removing excess water
c.
using pseudopodia for capturing prey
d.
having two types of nuclei
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Which of the following features is used to identify a male cockroach from a female cockroach?
a.
Presence of a boat shaped sternum on the 9th abdominal segment
b.
Presence of caudal styles
c.
Forewings with darker tegmina
d.
Presence of anal cerci
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Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively?
a.
Inflammation of bronchioles; Decreased respiratory surface
b.
Increased number of bronchioles; Increased respiratory surface
c.
Increased respiratory surface; Inflammation of bronchioles
d.
Decreased respiratory surface; Inflammation of bronchioles
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Match the items given in Column I with those in Column II and select the correct option given below:
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Match the items given in Column I with those in Column II and select the correct option given below:
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AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA?
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According to Hugo de Vries, the mechanism of evolution is
a.
Multiple step mutations
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According to Hugo de Vries, the mechanism of evolution is
a.
Multiple step mutations
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Match the items given in Column I with those in Column II and select the correct option given below:
Column I: a. Proliferative Phase, b. Secretory Phase, c. Menstruation
Column II: i. Breakdown of endometrial lining, ii. Follicular Phase, iii. Luteal Phase
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Match the items given in Column I with those in Column II and select the correct option given below:
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A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by
d.
Both sons and daughters
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A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by
d.
Both sons and daughters
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All of the following are part of an operon except
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All of the following are part of an operon except
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Which of the following gastric cells indirectly help in erythropoiesis?
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Which of the following gastric cells indirectly help in erythropoiesis?
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Match the items given in Column I with those in Column II and select the correct option given below:
Column I: a. Fibrinogen, b. Globulin, c. Albumin
Column II: i. Osmotic balance, ii. Blood clotting, iii. Defence mechanism
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Calcium is important in skeletal muscle contraction because it
a.
binds to troponin to remove the masking of active sites on actin for myosin.
b.
activates the myosin ATPase by binding to it.
c.
detaches the myosin head from the actin filament.
d.
prevents the formation of bonds between the myosin cross bridges and the actin filament.
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Which of the following is an occupational respiratory disorder?
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