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Plant Growth And Development

339 Questions Start Allen Test
All Exams Allen Errorless
Q226 Allen PYQ MCQ
F. Skoog observed that callus proliferated from the internodal segments of tobacco stem when auxin was supplied with one of the following except :-
A.
Extract of Vascular tissue
B.
Coconut milk
C.
Abscisic acid
D.
Yeast Extract
Q227 Allen PYQ MCQ
Given below are some statements about plant growth regulators.
(A) All GAs are acidic in nature.
(B) Auxins are antagonists to GAs.
(C) Zeatin was isolated from coconut milk.
(D) Ethylene induces flowering in Mango.
(E) Abscisic acid induces parthenocarpy.
A.
A, C, D
B.
B, E
C.
A, B, C
D.
B, D, E
Q228 Allen NCERT BASED QUESTIONS MCQ
Which of the following is a characteristic feature of meristematic cells ?
A.
Cells are rich in protoplasm
B.
Cell walls are primary in nature
C.
Presence of large conspicuous nuclei
D.
All of the above
Q229 Allen NCERT BASED QUESTIONS MCQ
Who isolated Auxin from tip of coleoptiles of oat seedlings?
A.
Chales Darwin
B.
Kogl
C.
F.W. Went
D.
Skoog
Q230 Allen NCERT BASED QUESTIONS MCQ
'Bakanae disease of rice seedlings' was caused by Gibberella fujikuroi' Which is -
A.
a Bacteria
B.
an Algae
C.
a Protista
D.
a Fungus
Q231 Allen NCERT BASED QUESTIONS MCQ
Hormone, which is sprayed on young conifers to hasten the maturity period and early seed production, is -
A.
Ethylene
B.
ABA
C.
Gibberellin
D.
Cytokinin
Q232 Allen NCERT BASED QUESTIONS MCQ
Ethylene is used to initiate flowering and for synchronising fruit set in -
A.
Rice
B.
Potato
C.
Pineapple
D.
Cherry
Q233 Allen NCERT BASED QUESTIONS MCQ
Growth is measured by a variety of parameters, among following which is not included in these?
A.
Fresh weight
B.
Dry weight
C.
Surface area
D.
Cell type
Q234 Allen NCERT BASED QUESTIONS MCQ
Spraying sugarcane crop with gibberellins increases the length of the stem, thus increasing the yield by as much as :-
A.
30 tonnes per acre
B.
40 tonnes per acre
C.
20 tonnes per acre
D.
50 tonnes per acre
Q235 Allen NCERT BASED QUESTIONS MCQ
Among the following which is not present naturally in plants?
A.
Auxin
B.
Gibberellin
C.
Kinetin
D.
Zeatin
Q236 Allen NCERT BASED QUESTIONS MCQ
Among the following which is not a function of ethylene?
A.
Breaks bud and seed dormancy
B.
Promotes root growth
C.
Delay senescence
D.
Initiate flowering
Q237 Allen NCERT BASED QUESTIONS MCQ
Plants follow different pathways in response to environment to form different kinds of structures, that is called :-
A.
Plasticity
B.
Senescence
C.
Photoperiodism
D.
Vernalisation
Q238 Allen NCERT BASED QUESTIONS MCQ
Which causes fruits like apple to elongate & improve its shape?
A.
Ethylene
B.
Gibberellins
C.
Auxin
D.
ABA
Q239 Allen NCERT BASED QUESTIONS MCQ
2, 4-D is a :-
A.
Synthetic auxin
B.
Natural auxin
C.
Synthetic cytokinin
D.
Natural cytokinin
Q240 Allen NCERT BASED QUESTIONS MCQ
Which of the following increases the tolerance of plants to various kind of stresses?
A.
ABA
B.
Ethylene
C.
Auxin
D.
Cytokinin
Q241 Allen NCERT BASED QUESTIONS MCQ
Which of following is used to speed up the malting process in brewing industry ?
A.
Auxin
B.
$\mathsf { G A } _ { 3 }$
C.
Kinetin
D.
ABA
Q242 Allen NCERT BASED QUESTIONS MCQ
Cells/tissues arising out of the same meristem have different structures at maturity, this phenomenon in plants is called:
A.
Open growth
B.
Open differentiation
C.
Indeterminate growth
D.
Determinate differentiation
Q243 Allen NCERT BASED QUESTIONS MCQ
The gaseous plant growth regulator ethylene could fit in the group of :-
A.
Plant growth inhibitors
B.
Plant growth promoters
C.
Both (1) and (2)
D.
Neither inhibitors nor promoters
Q244 Allen NCERT BASED QUESTIONS MCQ
Which of the following physiological effects, is common to both Auxin and Ethylene?
A.
Sprouting of potato tuber
B.
Petiole elongation in deep water rice plants
C.
Flowering in pineapple
D.
Weed killing
Q245 Allen NCERT BASED QUESTIONS MCQ
Which of the following is not correctly matched?
A.
Delay leaf senescence ā‡’ Cytokinin
B.
Induce rooting in a twig ā‡’ Auxin
C.
Induce growth in axillary bud ā‡’ Auxin
D.
Quickly ripen a fruit ā‡’ Ethylene
Q246 Allen NCERT BASED QUESTIONS MCQ
Regarding factors affecting the development, PGR is the :-
A.
Extrinsic control
B.
Intrinsic intra cellular control
C.
Neither intrinsic nor extrinsic control
D.
Intrinsic inter cellular control
Q247 Allen NCERT BASED QUESTIONS MCQ
Arithmetic growth is related to :-
A.
${ \mathsf { L } } _ { \mathrm { t } } = { \mathsf { L } } _ { 0 } \mathsf { e } ^ { \mathsf { r } \mathrm { t } }$
B.
$\mathsf { W } _ { 1 } = \mathsf { W } _ { 0 } \mathsf { e } ^ { \mathsf { r t } }$
C.
Lt = Lo + rt
D.
${ \mathsf { L } } _ { 0 } = { \mathsf { L } } _ { \mathrm { t } } \mathsf { e } ^ { \mathsf { r t } }$
Q248 Allen NCERT BASED QUESTIONS MCQ
Go through the following figure :- Choose the correct labelling.
A.
Log phase ā€” Exponential phase ā€” Stationary phase
B.
Lag phase ā€” Exponential phase ā€” Stationary phase
C.
Exponential phase ā€” Log phase ā€” Stationary phase
D.
Stationary phase ā€” Exponential phase ā€” Log phase
Q249 Allen NCERT BASED QUESTIONS MCQ
Which statement is not correct about ethylene ?
A.
Synthesized in large amount by tissues undergoing senescence.
B.
Enhances respiration rate during ripening of the fruits
C.
Breaks dormancy in peanut seeds
D.
Promotes male flowers in cucumber
Q250 Allen NCERT BASED QUESTIONS MCQ
Which of the following plant growth regulators is responsible for 'respiratory climactic'?
A.
Auxin
B.
Ethylene
C.
ABA
D.
Cytokinin