School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Formation and release of a fully-formed egg is known as
A)
capacitation
B)
oogenesis
C)
ovulation
D)
amphimixis
Ovulation = release of mature ovum from ovary.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Gymnosperms do not bear fruits because
A)
They are pollinated
B)
They lack ovary
C)
They produce spores
D)
They do not have seeds
Gymnosperms have naked seeds, ovules not enclosed in ovary, so no true fruit.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
The power house of cell is
A)
Ribosome
B)
Golgi complex
C)
Mitochondria
D)
Lysosome
Mitochondria generates ATP via oxidative phosphorylation – powerhouse.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Bt crops are genetically created to make them
A)
resistant to insect
B)
resistant to pesticide
C)
resistant to bacterial infection
D)
resistant to desiccation
Bt crops express Bacillus thuringiensis Cry toxin conferring insect resistance.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
The first documented example of natural selection in action was
A)
antibiotic resistance
B)
drug resistance in Plasmodium
C)
pesticide resistance in insects
D)
melanism in peppered moths
Industrial melanism in Biston betularia peppered moths documented by Kettlewell 1950s as first natural selection observation.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
A DNA molecule obtained from plasmids and viruses used to create a recombinant DNA is called
A)
restriction enzyme
B)
vector
C)
promoter
D)
operator
Vector from plasmid/virus carries foreign DNA to create recombinant DNA.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Double fertilization was discovered by
A)
Hofmeister
B)
Leeuwenhock
C)
Hooke
D)
Nawaschin
S.G. Nawaschin 1898 discovered double fertilization in Lilium/Fritillaria.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Chlorofluorocarbons (CFCs) cause
A)
Depletion of CO2
B)
Depletion of ozone layer
C)
Increase of ozone layer
D)
Increase of CO2
CFCs release Cl radicals depleting ozone.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Natality in a population refers to
A)
death rate
B)
national competence
C)
birth rate
D)
national fecundity
Natality = birth rate, mortality = death rate.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Choose the box that is similar to the box formed from the given sheet of paper (X).
A)
1
B)
2
C)
3
D)
4
Box formation figure not provided; provisional answer 1 based on typical cube net. [Image missing]
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
The number of major mass extinction on Earth is
A)
4
B)
5
C)
6
D)
7
Five major mass extinctions: Ordovician, Late Devonian, Permian-Triassic, Triassic-Jurassic, Cretaceous-Paleogene.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
The process of yolk deposition and formation is known as
A)
vitellogenesis
B)
albuminosis
C)
spermiogenesis
D)
choriogenesis
Vitellogenesis = yolk protein synthesis/deposition in oocyte.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Diffusion of water across a semipermeable membrane is called
A)
Osmosis
B)
Apoplast
C)
Symplast
D)
Guttation
Osmosis is passive diffusion of water across semipermeable membrane.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Excessive deposition of phosphorus (phosphate) in water can cause
A)
algal bloom
B)
plankton depletion
C)
carbonation
D)
leaching
Excess phosphate causes eutrophication leading to algal bloom.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Numerous microbes live inside our gut with reciprocal benefits, which is an example of
A)
parasitism
B)
competition
C)
predation
D)
mutualism
Reciprocal benefit symbiosis in gut flora = mutualism.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Ozone layer is present in
A)
Troposphere
B)
Stratosphere
C)
Mesosphere
D)
Ionosphere
Ozone layer ~15-35 km in stratosphere absorbing UV.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Peptide formation (translation) occurs in the cell organelle
A)
Golgi complex
B)
ribosome
C)
nucleus
D)
peroxisome
Translation/protein synthesis on ribosomes.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
DPD stands for
A)
Daily photosynthetic depression
B)
Daily phosphorus demand
C)
Diffusion pressure deficit
D)
Diffusion pressure demand
Diffusion pressure deficit – historical term for water potential negative value.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
The total of the ages of Thana, Thanga, Tluanga and Thuama is 80 years. What was the total of their ages three years ago?
A)
66 years
B)
68 years
C)
70 years
D)
71 years
Total then 80. 3 years ago each person -3 => 4*3=12 less: 80-12=68.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
The purpose of IUCN Red List is to assess the
A)
habitat assimilation of species
B)
species richness
C)
extinction risk of species
D)
population explosion
IUCN Red List assesses extinction risk categories (VU, EN, CR etc).
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Development of more than one embryo in a seed is called
A)
Geitonogamy
B)
Palynology
C)
Polyembryony
D)
Xenogamy
Polyembryony = multiple embryos in one seed.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Lichens have symbiotic relationship between
A)
Alga and bacteria
B)
Alga and fungus
C)
Bacteria and fungus
D)
Fern and bacteria
Lichen = phycobiont (alga/cyanobacteria) + mycobiont (fungus).
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Saccharomyces cerevisiae is used for making
A)
curd and yogurt
B)
wine and cheese
C)
bread and alcohol
D)
butter and cheese
Saccharomyces cerevisiae ferments sugars to ethanol and CO2 used for bread leavening and alcohol.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
Plants cell differ from animal cells in having
A)
Centrosome
B)
Vacuoles
C)
Plastids
D)
Nucleus
Plant cells possess plastids/chloroplasts, large central vacuole and cell wall unlike animals.
School Teacher • 2017 • Technical Paper-II (Botany & Zoology)
The four nitrogenous bases in ribonucleic acid (RNA) are
A)
adenine, guanine, uracil, cytosine
B)
adenine, uracil, thymine, cytosine
C)
adenine, guanine, thymine, cytosine
D)
thymine, uracil, guanine, cytosine
RNA contains A,G,C,U (U replaces T of DNA).
