Determine the correctness or otherwise of the following Assertion [A] and the Reason [R] .Assertion [A]: A zygote and its immediate descendant cells are unspecialized and are called totipotent.Reason [R]: Totipotent cells retain the capacity to differentiate into only a few cell types.
A. Both [A] and [R] are false
B. Both [A] and [R] are true but [R] is not the correct reason for [A]
C. Both [A] and [R] are true and [R] is the correct reason for [A]
D. [A] is true but [R] is false
Select an option to see the answer and solution.
Plant secondary metabolites
A. Help to increase the growth rate of plant
B. Help in plant reproduction processes
C. Provide defense mechanisms against microbial attack
D. Make the plant susceptible to unfavorable conditions
Select an option to see the answer and solution.
Determine the correctness or otherwise of the following Assertion (A) and Reason (R) .Assertion: The production of secondary metabolites in plant cell cultures is enhanced by the addition of elicitors.Reason: Elicitors induce the expression of enzymes responsible for the biosynthesis of secondary metabolites.
A. Both (A) and (R) are true but (R) is not the correct reason for (A)
B. Both (A) and (R) are true and (R) is the correct reason for (A)
C. (A) is true but (R) is false
D. (A) is false but (R) is true
Select an option to see the answer and solution.
When present in tissue culture medium, gibberellin
A. Helps to break dormancy of buds and bulbs
B. Promotes dormancy development in buds and bulbs
C. Is regarded as plant growth inhibitor
D. Prevents normal recognition of auxin molecule
Select an option to see the answer and solution.
Callus formation from mature tissue explant occurs through
A. Dedifferentiation
B. Redifferentiation
C. Both A and B of the above
D. Neither A nor B
Select an option to see the answer and solution.
Identify the natural plant growth regulators from the following list.
Select an option to see the answer and solution.
Which one of the following is the growth factor used for growth of tissues and organs in plant tissue culture?
A. Cysteine
B. Cytokinin
C. Cytidylate
D. Cyclic AMP
Select an option to see the answer and solution.
Match the promoters Listed in
Group I with the tissues listed in
Group II
Group I Group II
P. α-Amylase
1. Endosperm
Q. Glutenin
2. Tuber
R. Phaseollin
3. Aleurone
S. Patatin
4. Cotyledon
A. P-3, Q-1, R-4, S-2
B. P-3, Q-4, R-1, S-2
C. P-4, Q-2, R-1, S-3
D. P-1, Q-3, R-2, S-4
Select an option to see the answer and solution.
The transplastomic plants bear no risk for gene transfer through pollens as
A. The pollens degenerate before fertilization
B. The transformed mitochondrial DNA is lost during pollen maturation
C. The transformed chloroplast DNA is lost during pollen maturation
D. The transformed genomic DNA are inherited maternally
Select an option to see the answer and solution.
Which of the following statements is most appropriate for recombinant antibody production in transgenic plants?
A. A very high level expression is always obtained
B. Light promote more antibody production
C. Such antibodies are free from other antigen of animal origin
D. Functional antibody cannot be produced in plants
Select an option to see the answer and solution.
What would he the effect of addition of 2, 4-D on the production of berberine by cell culture of Thalictrum minus?
A. To stimulate growth and thereby urease secondary metabolite production
B. Stimulate dedifferentiation and thereby decrease secondary metabolite production
C. Stimulate proliferation and reduce secondary metabolite production
D. None of the above
Select an option to see the answer and solution.
Multiplication of genetically identical copies of a cultivar by asexual reproduction is known as
A. Aclonal propagation
B. Vegetative propagation
C. Polyclonal propagation
D. Clonal propagation
Select an option to see the answer and solution.
Which one of the following is a second generation genetically engineered crop?
A. Bt brinjal
B. Roundup soyabean
C. Golden rice
D. Bt rice
Select an option to see the answer and solution.
Which of the following combinations of plant hormones and their associated function are correct?
Hormone Function
P. Abscisic acid
1. Breaks seed dormancy
Q. Auxin
2. Induces cell division
R. Ethylene
3. Stimulates ripening of fruits
S. Gibberellin
4. Promotes seed dormancy
A. P and R only
B. P and S only
C. Q and R only
D. Q and S only
Select an option to see the answer and solution.
Tobacco leaf discs are transferred with Agrobacterium tumefaciens strain containing binary vector (GUS as reporter gene) with selectable marker neo (kanamycin resistance gene) and then regenerated to plants. The plants are kanamycin resistant, but leaf tissues are negative to GUS assay. The explanation is
A. The plants are transformed for both genes but GUS gene is turned
B. The plants are transformed for only neo gene not the GUS gene
C. The plants are not transformed at all, but the development of kanamycin resistance is due to somaclonal variation
D. All the above
Select an option to see the answer and solution.
The plant hormone indole-3-acetic acid is derived from
A. Histidine
B. Tyrosine
C. Tryptophan
D. Proline
Select an option to see the answer and solution.
Match the following plant sources with their secondary metabolites and medical uses.
Source plant Secondary metabolites Medical use
P. Belladonna
1. Menthol
a. Cancer treatment
Q. Foxglove
2. Atropine
b. Heart disease
R. Pacific yew
3. Digitalin
c. Eye examination
S. Eucalyptus
4. Taxol
d. Cough
A. P-2-c, Q-3-b, R--4-a, S-1-d
B. P-3-c, Q-2-a, R-1-d, S-4-b
C. P-2-c, Q-4-b, R-1-a, S-3-d
D. P-1-b, Q-4-c, R-2-d, S-3-a
Select an option to see the answer and solution.
Hormone pairs required for a callus to differentiate are
A. Auxin and cytokinin
B. Auxin and gibberellin
C. Ethylene and gibberellin
D. Cytokinin and gibberellin
Select an option to see the answer and solution.
Resistance to herbicide chlorsulfuron in plants is due to change in
A. Glutamine synthetase
B. Acetolactate synthase
C. Theronine deaminase
D. DNA polymerase
Select an option to see the answer and solution.
The pungency of mustard seeds is primarily due to secondary metabolites such as isothiocyanate and nitrile. The pungency is usually felt only when the seeds are crushed. This is because of
A. The coat of the intact seeds blocks the pungent volatiles from being released
B. The pungent chemicals are stored as inactive conjugates and compartmentalized from the enzymes that convert them into active chemicals
C. The pungent chemicals are formed only after the reaction with atmospheric oxygen
D. The pungent chemicals are formed only after the reaction with atmospheric carbon dioxide
Select an option to see the answer and solution.
