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WorksheetsFull Syllabus (12th)
Total questions: 45
Worksheet time: 23mins
Biomagnification is the process of
breeding crops with higher levels of vitamins and
minerals, or higher protein and healthier fats
increased concentration of organic matter in aquatic ecosystem
Increased concentration of toxicant in successive tropic level
Magnifying objects placed under EM
Consider the following statements.
Statement I: Unlike tropical one, temperate environment are less seasonal and are relatively more constant.
Statement II: Constant environment provides niche specialization and leads to greater species diversity.
Statement III: More solar energy is available in the tropics, contributes to its higher productivity.
Only statement I is correct.
Statement I and III are correct.
Statement II and III are correct.
All the statements are correct.
Which of the following is not a consequence due to loss of biodiversity in ecosystem?
Decline in plant production
Increased variability in in ecosystem processes
Increased resistance to environmental perturbations
Co-extinction
Consider the following statement and mark the correct option.
Statement I: The ethical argument for conserving biodiversity says that we have a moral duty to care for biodiversity and pass on it to future generations.
Statement II: According to broadly utilitarian argument, biodiversity plays a major role in many ecosystem services that nature provides.
Only statement I is correct.
Only statement Ii is correct.
Both the statements are correct.
Both the statements are incorrect.
Which of the following is put into Anaerobic sludge digester for further sewage treatment?
Effluents of primary treatment
Activated sludge
Primary sludge
Floating debris
Which of the following shows the correct sequence of steps involved in breeding a new genetic variety of a crop?
a. Selection and testing of superior recombinants
b. Germplasm collection
c. Cross hybridisation among the selected parents
d. Evaluation and selection
e. Testing, release, and commercialization of new cultivars
b, d, c, a, and e
a, b, d, c, and e
c, d, a, b, and e
b, c, a, d, and e
Statins used for lowering blood cholesterol level are extracted from
algae
bacteria
viruses
yeast
Toddy is prepared by the fermentation of the sap obtained from
palms.
bamboo.
grapes.
Cycas.
Green plants convert sunlight energy into the energy of
Ionic bond
Hydrogen bond
Chemical bond
Hydrophobic bond
Secondary productivity is rate of formation of new organic matter by:
Autotroph
Consumer
Decomposer
Producer
Pyramid of biomass for a terrestrial grazing food chain represents
gradual decrease in biomass from apex to base
gradual decrease in biomass from producers to the tertiary consumers
gradual increase of the biomass from producers to the tertiary consumers
no change in biomass
Study the following statements and select the incorrect one.
Shorter food chains provide more energy as compared to longer food chains.
Ecological factors connected with physical geography of earth are called topographic factors.
The pyramid of biomass is upright in a grassland ecosystem and the pyramid of numbers is upright in a parasitic food chain.
None of these
Read the following statements and select the correct ones.
(i) Ahmed Khan, a plastic sack manufacturer of Bangalore, in 1998, developed polyblend, a fine powder of recycled modified plastic.
(ii) In collaboration with RV College of Engineering and Bangalore City Corporation, he proved that the mixture of polyblend and bitumen was better for road carpeting as it had better water repellent property.
(iii) By 2002, more than 40 km roads of Bangalore were laid with the help of Khan's mixture.
(iv) Rag pickers who used to get INR 0.40 per kg of plastic waste started getting INR 6.00 from Ahmed Khan,
(i), (ii) and (iii)
(ii), (iv) only
(iii), (iv) only
All of these
Select the correct statement out of the following.
Electrostatic precipitators (ESPs) can remove over 99% particulate matter present in the exhaust from a thermal power plant.
Over half of the e-wastes generated in developed countries are exported to developing countries, mainly to China, India and Pakistan, where metals like Cu, Fe, Si, Ni, etc., are recovered during recycling process.
Use of nuclear energy has two very serious inherent problems first is accidental leakage and the second is safe disposal of radioactive wastes.
All of these
A Scrubber
can remove gases like ozone and CFC.
is equipped with a spray of water or lime through which exhaust containing gases such as SO2 is allowed to pass.
is the most widely used technique to remove particulate matter.
is fitted in automobiles to reduce the emission of poisonous gases.
Statement I: Montreal Protocol signed in 1987 aims to control the emission of ozone-depleting substances.
Statement II: The idea of laying roads with a mixture of polyblend and bitumen was suggested by Ramesh Chandra Dagar.
Both statements are correct
Only statement I is correct
Only statement II is correct
Both the statements are incorrect
Which one of the following is the correct percentage of the two (out of the total of 4) green-house gases that contribute to the total global warming?
CFCs 14%, CH4 20%
CO2 40%, CFCs 30%
N2O 6%, CO2 86%
CH4 20%, N2O 18%
In eukaryotes, non-coding intervening sequences present in the product of transcription are known as
Exons
Cistron
Introns
Polysome
A DNA molecule has 45% guanine in it. What will be the percentage of adenine in this DNA molecule?
10%
5%
45%
25%
The number of N-glycosidic bonds present in single stranded viral DNA having 5346 nucleotides are
5346
5345
10,692
10,690
In prokaryotes,
Translation and transcription can occur simultaneously in cytosol.
There are at least three RNA polymerases in the nucleus.
Heterogenous nuclear RNA undergoes a process of removal of introns known as splicing.
The transcribed RNA consists of poly A tail at 3’ end.
Semi-conservative nature of DNA replication was first shown in
Bacteriophages
Streptococcus pneumoniae
Human cells
Escherichia coli
Which of the following is the correct sequence of steps taking place during translation?
a) Aminoacylation of tRNA
b) Initiation
c) Termination
d) Elongation
a,b,d,c
b,c,d,a
a,c,d,b
a,d,c,b
What are those structures that appear as 'beads-on-string' in the chromosomes when viewed under electron microscope?
Nucleotides
Nucleosomes
Base pairs
Gene
Which one of the following is not a biofertilizer?
Rhizobium
Nostoc
Mycorrhiza
Agrobacterium
The experiment, which proved conclusively that during infection only DNA of the bacteriophage enters the host cell and the protein coat remains behind, was conducted by
F. Griffith
Avery, Macleod and Mc Carty
Sutton and Boveri
Hershey and Chase
In phenylketonuria
Break down of phenylalanine is rapid
Accumulation of phenylalanine in body
Chromosomal constitution of patient changes
TSD gene situated on chromosome 15 undergoes mutation
Which of the following correctly defines the purity of gametes?
Law of independent assortment
Law of segregation
Blending inheritance
Co-dominance
A normal-visioned man whose father was color blind marries a woman whose father was also colorblind. They have their first child as a daughter. What are the chances. That this child would be colorblind?
100%
0%
25%
50%
Mendel failed to get linkage during his experiments because
Genes selected by him were located on the same chromosome
Genes selected by him was discrete and unstable
The 7 character which he selected for studies were behaving independently
None of the pea characters show linkage
In a cross one parent is heterozygous, and other one is homozygous. What will be the genotype of the F1 progeny?
50% progeny will be identical to one parent 50% progeny will be identical to another parent.
50% progeny will be identical to one parent 25% progeny will be identical to another parent
25% progeny will be identical to one parent 25% progeny will be identical to another parent
100% identical to only one of the parents.
Read the following statements and choose the correct option:
a) The number of linkage groups is equivalent to haploid number of chromosomes in Human females.
b) Close linkage between genes of cultivated varieties makes it easier for plant breeders to bring all desirable traits in one variety.
Only a is correct
Only b is correct
Both a and b are correct
Both a and b are incorrect
Identify the correct statements.
Experimental verification of chromosomal theory of inheritance was done by using fruit flies.
Sutton and Boveri coined the term ‘Linkage’
The male Drosophila are larger in size than female Drosophila
Genetic mapping of genes is based on their independent assortment.
In a population of 960 progenies obtained as a result of monohybrid cross between two axially and terminally placed flower in Pisum sativum. Assuming complete segregation in the gamete formation, how many progenies will be having terminally located flowers?
240
720
480
143
The characters which appear in the first filial generation are called
recessive characters
dominant characters
holandric characters
lethal characters
In a monohybrid cross between two heterozygous individuals, percentage of pure homozygous individuals obtained in F1 generation will be
25%
50%
75%
100%
Strobilanthus kunthiana flowers once in.
5 years
12 years
20 years
50 years
Monoecious plant of Chara shows the occurrence of:
stamen and carpel of the same plant
upper antheridium and lower oogonium on the same plant
upper oogonium and lower antheridium on the same plant
antheridiophore and archegoniophore on the same plant
In Amoeba, binary fission is a process in which
Karyokinesis is followed by cytokinesis
Nucleus is divided into many daughter nuclei
The resulting daughter cells do not resemble with their parents
Without nuclear division only cytoplasm divides
During embryogenesis, the event that does not occur is
Cell division
Cell differentiation
Gameotogenesis
Both A and C
Parthenogenesis is the process of formation of
Fruit without seed
Organism without fertilisation
Seed without fertilization
Both A and C
Carpels are equal to
Androecium
Embryo sac
Microsporophylls
Gynoecium
Mesogamy is
fusion of male and female gametes
fusion of physiologically similar and morphologically different gametes
entry of pollen tube through integuments
None of the above
Egg apparatus
Is a 7 called 8 nucleated structure
Is composed of diploid cells
Is present towards the micropylar end of embryo sac
Is not a part of female gametophyte
Number of pollen grains formed from the 4 sporogenous cells in an anther are
4
8
12
16
