NEW
Font size
WorksheetsQuizzards - PG
Total questions: 50
Worksheet time: 24mins
In a lake, reducing the population of a fish that feeds on plankton was followed by a decline in the rate of primary productivity. This is consistent with which one of the following hypotheses regarding the regulation of primary productivity?
Bottom- up- control
Eutrophication
Top-down control
Trophic pyramid
Which one of the following plants has this combination of key plant traits : sporophyte dominant in the lifecycle, vascular tissue, lack of seeds?
Mosses
Ferns
Cycads
Monocots
Which one of the following reactions take place during the reduction phase of the Calvin Benson cycle ?
1,3-bisphosphoglycerate to glyceraldehyde-3-phosphate
Dihydroxyacetone phosphate to fructose 1,6- bisphosphate
Ribulose 5-phosphate to ribulose 1,5-bisphosphate
Ribulose 1,5-bisphosphate to 3- phosphoglycerate
Which one of the following bases has the largest hydrogen bonding possibility?
Adenine
Guanine
Cytosine
Uracil
In bacteria, chromosomal DNA replication starts at ?
One specific locus
Several specific loci
A single locus, randomly
From several loci, randomly
Which of the following phenomenon is observed incompatible with plant- pathogen interactions?
Virulence in the pathogen
Hypersensitive response in the host
Resistance in the host
Avirulence in the pathogen
During double fertilization in plants, one sperm fuses with the egg cell and the other sperm fuses with?
Synergid cell
Central cell
Antipodal cell
Nuclear cell
Under which conditions do members of the family Gramineae synthesize and release phytosiderophores?
Iron deficiency
Phosphorus deficiency
Availability of iron complexes in the rhizosphere
Availability of phosphorus complexes in rhizosphere
The membranes of chilling-sensitive plants
are characterized by
higher proportion of saturated fatty acids
lower transition temperature
lower proportion of saturated fatty acids
None of the above
A cross is made between a pure breeding plant having red-colored flowers with a pure breeding
plant having white-colored flowers. Such a cross is called as
test cross.
monohybrid cross.
dihybrid cross.
back cross
Annual weeds of arable lands are classified
as
phanerophytes
therophytes
chamaephytes
geophytes
The fungal group presently classified under protists is
Zygomycetes
Oomycetes
Deuteromycetes.
Discomycetes
Which of the following are the most appropriate spectral bands for vegetation using remote sensing
platforms?
Red, Near-Infrared
Infrared, Visible
Red, Microwave
Visible, Microwave
Chinese Brake fern (Pteris vittata) is a hyperaccumulator of:
Cadmium
Arsenic
Lead
Chromium
Which of the following transgenic crop(s) has been approved for commercial cultivation in India?
Cotton
Brinjal
Cotton and brinjal
Cotton, Brassica, brinjal
When a person enters a dark room from bright sunlight he cannot see anything for a few
seconds because
Rhodoposin pigment of rod cells is inactivated in bright light which takes time and is
activated in dark and associate with opsin protein biologycias
Scotopsin proteins of rods are denatured
All Scotopsin are bound with retinal in rod cells
All Sctoposin becomes non-functional in bright light
Substrate for DNA synthesis is?
Nucleotide tri phosphate
Nucleoside tri phosphate
Nucleoside pyrophosphate
Ribonucleotide tri phosphate
In a certain genetic cross, 1/16 proportion of progeny shows mutant phenotype. It means
Two independent assorting genes are involved for trait
Two independently assorting duplicate genes are involved
Two linked genes are involved for trait
Two independent segregating alleles are responsible for trait
Spontaneity of mutation means
Mutation in absence of exogenous mutagen
Mutation directly proportion to presence of mutagen
Mutation inversely proportion to
presence of mutagen
Mutation at in appropriate time
Which statement is correct for membrane receptors for signal transduction?
Contain single or multiple membranes spanning domain
Always coupled with trimeric G protein
Always results in production of secondary messenger
Recognized non-polar signaling molecules
The organelle of C3 plants, where glyoxylate is formed is ww
Chloroplast
Peroxisome
Mitochondria
Cytosol
Which of the following is produced in phenyl propanoid pathway?
Phenolics
Carotenes
Alkaloids
Terpenes
Which of the following helps in osmoprotection in plants?
Proline
Tryptophan
Glycine
Levulinic acid
Which of the following small G-protein is involved in nuclear transport and targeting? lass
Ras
Ran
Rab
Rho
Which of the following is not a characteristic feature of Apoptosis?
Swelling of cell
Nuclear fragmentation
Change in cell wall porosity
Permeability of mitochondrial inner membrane
Which statement is correct in relation of activity of telomerase?
Increase with age
Observed in all cancers and responsible for immortality
Responsible for apoptosis but not for ageing
Re-synthesize telomeres
The causal organism for blast of rice is
Pyricularia grisea
Ustilago tritici
Erwinia chrysanthemi
Cercospora janseana
At any place if more diversity and variation is observed in any species of domestic animal,
then it can be concluded that
Place is natural center of origin of that species
Animal has been introduced once and is invasive
Animal has been introduced more than once
People take more care of animals
Among the following which is typical tree of Indian desert ecosystem?
Prosopis cineraria
Avicennia officinalis
Mangifera indica
Acer negundo
Which of the following is not an invasive plant species in India?
Parthenium hysterophorus
Salvinia molesta
Lantana camara
Myristica fica
There is small gap between two neurons at synapses. The purpose of gap is
Unidirectional flow of information
Reabsorbtion of neurotransmitter
oupling of charge over membrane
Slow down speed of propagation
Most abundant intracellular ion in plants is:
Iron
Calcium
Potassium
Zinc
Na-K pump operates under intracellular concentration of
High Na and low K
High Na and High K
Low Na and low K
Low Na and high K
Precursor for amino acid proline is:
Pyruvate
3-Phosphoglycerate
Oxalo acetate
Alpha-keto glutarate
Molecular evolution do not reflects
Species divergence
Convergent evolution
Natural selection
Neutral mutation
Allele frequency of a particular allele was found to be 0.6 in three different populations. It is
probably due to it's
Neutral allele
Stable polymorphism
Heterozygote advantage
Natural selection
Cell with large round size has more chance to survive as compare to thin cellunder
dessication because of
Low surface to volume ratio
Thin membrane
High surface
to volume ratio
Thick membrane
Which of the following is not a direct consequence of greenhouse effect?
Increase in sea level
Rainfall
Tsunami
Global warming
NaCl has ionic bond because
Both Na and Cl has same number of valence electron
Both Na and Cl belongs to same group
Na loses one electron and chlorine receive one electron
Due to difference in their electronegativity
Smog is due to:
Air pollution derived from smoke and vehicles
More moisture in environment
Increase in CO₂
Low temperature of earth surface
Which species conceptutilizes morphological and molecular characters to distinguish
between species?
Evolutionary
Biological
Ecological
Phylogenetic
The plant hormone indole-3-acetic acid (IAA) is present in most plants. The structure of this
hormone is related to which one of the following amino acids?
Glutamic acid
Aspartic acid
Lysine
Tryptophan
In which ecosystem is the detrital pathway of energy flow most important?
Lakes
Grasslands
Tropical rain forests
Oceans
Light is the dominant environmental signal that controls stomatal movement in leaves of well-
watered plants grown in natural environment. Which one of the following wavelengths of light is
responsible for such regulation?
Red light
Blue light
Green light
Far-red light
Which one of the following statements regarding seed germination of a wild type plant is
NOT correct?
Low ABA and high bioactive GA can break seed dormancy.
Light accompanied with high temp erature can break seed dormancy.
GA induces synthesis of hydrolytic enzymes in cereal grains
Degradation of carbohydrates and storage proteins provide nourishment and energy to
support seedling growth.
Proton motive force during oxidative phosphorylation is generated in mitochondria by
exchanging protons for sodium ions
pumping protons out into intermembrane space
pumping hydroxyl ions into the mitochondria
hydrolysis of ATP
A weed is assumed to be dispersed randomly in a meadow. What statistical distribution will
describe the dispersion correctly?
Binomial
Negative Binomial
Poisson
Normal
In chloroplast, the site of coupled oxidation-reduction reactions is the
outer membrane
inner membrane
thylakoid space
stromal space
Optimum temperature for growth of extemo thermophiles is
0⁰ C
20° C
50⁰ C
Over 80° C
Consider the following codons.Which of these are considered to be the termination
codons in
protein synthesis?
I. UAA
2. UAG
3. UAC
1,2 and3
I and2
2and3
l and3
