Ethephon
Thinning Cotton, Cherry and Walnut
Promotes female flowers in cucumber
Hastens the fruit ripening in tomatoes and apples
All of these
Abscisic Acid
Which of the following is not correct?
Acts as general plant growth inhibitor and an inhibitor of plant metabolism
Inhibits seed germination
Stimulates the opening of stomata in the epidermis
Increases the tolerance of plants to various kinds of stresses
Which of the following is a stress hormone in plants?
ABA
GA3
Cytokinin
Auxins
ABA plays an important role in except
Seed development
Maturation and dormancy
Helps seeds to withstand desiccation and other factors unfavorable for growth
Antagonist to Cytokinin
More than one PGR are not involved in which of the following physiological effect?
Dormancy in seeds or buds
Abscission, Apical Dominance
Senescence
Fruit Ripening
For the induction of flowering, some plants require a
Periodic exposure to light
Continuous exposure to light
No exposure to light
No exposure to night
If a plant needs exposure of light more than a well defined critical period for flowering, it would be called as-
Long day plants
Short day plants
Day neutral plants
Red light plants
When there is no such relation between exposure to light duration and induction of flowering response such plants are called
Far red light plants
Which of the following is not true for flowering?
Only duration of dark period is important
Certain plants depend not only on a combination of light and dark exposures but also their relative durations
The site of perception for light or dark duration are the leaves
There is a hormonal substance which migrates from leaves to shoot apices for inducing flowering only when the plants are exposed to the necessary inductive photoperiod.
Flowering can be affected in certain plants
by quantitative exposure to low temperature
by qualitative exposure to low temperature
Both A and B
It does not depend on low temperature exposure
Vernalisation prevents
Precocious reproductive development late in growing season
Late reproductive development
Flowering
Fruiting
Vernalisation
Disables the plant to have fruits
Enables the plants to have fruits
Enables the plants to have sufficient time to reach maturity
Brings senescence
Vernalisation refers to
The promotion of flowering by a period of high temperature
The inhibition of flowering by a period of low temperature
The promotion of flowering by a period of low temperature
The inhibition of flowering by a period of high temperature
Which of the following is not an action of ethylene?
Induces leaf abscission
Inhibits root hair growth - decreasing the efficiency of water and mineral absorption
Induces the growth of adventitious roots during flooding
Stimulates epinasty - leaf petiole grows out, leaf hangs down and curls into itself
The formation of interfascicular cambium in plants is due to:-
Non-differentiation
Heterophyllous development due to environment is an example of:-
Developmental noise
Gibberellic acid is a/an:-
The PGR used to initiate flowering and for synchronizing fruit-set in pineapples is:
Abscisic acid
Cytokinin does not help in:
Lateral shoot growth
In most situations, which of the following acts as an antagonist to GAs?
Which of the following is the site for perception of light/dark in plants?
A flash of red light followed by a flash of far-red light given during the middle of the night to a short-day plant will likely
Which of the following statements about plant hormones is false?
The growth of plants in nature is probably regulated by a combination of growth-stimulating and growth-inhibiting hormones.
Abscisic acid generally promotes growth.
Gibberellins stimulate cell enlargement.
Cytokinins promote cell division.
At the root apex the cells of the meristematic region are not characterized by:-
Being rich in protoplasm
All the following plants are biennials except:-
Identify the option where all the columns are not correctly matched:
PGR
Nature
Actions
1.
Auxin
Indole compounds
Apical dominance, Flowering in pineapples, Parthenocarpy in tomatoes
2.
Adenine derivative
Cell division, Adventitious shoot formation, Delay in leaf senescene
3.
Gibberellin
Terpene
Increase in length
4 .
Carotenoid derivative
Closure of stomata in water stress, inducing seed dormancy, inducing flowering in mango
The PGR used to induce parthenocarpy in tomatoes is:-
Primary and secondary growth are inhibited by:
Gibberellins
Cytokinins
Fruit and leaf drop at early stages can be prevented by the application of
you are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?
Auxin and cytokinin
Auxin and abscisic acid
Glbberellin & abscisic acid
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