50 Questions
What is the main role of gibberellins in plants?
Promote flowering and fruit development
Which plant hormone is known as the 'stress hormone'?
Abscisic Acid (ABA)
How do synthetic auxins help in weed control?
They selectively kill broad-leaved weeds
What is the key function of abscisic acid in relation to seeds?
Induce seed dormancy
In geotropism, why do roots grow downward and shoots grow upward?
Auxins accumulate on the lower side of the plant
What is the role of plant hormones in weed control?
Leveraging different sensitivities of plant species to specific hormones
How do gibberellins contribute to agriculture?
Promoting fruit development without fertilization
What effect does ABA have on stomata during drought conditions?
It induces stomatal closing to reduce water loss
Why are synthetic auxins applied to broad-leaved weeds?
To selectively kill weeds without harming grass or crops
What happens to leaf drop in autumn due to increased ABA levels?
Leaf drop is initiated by ABA levels
Which class of plant hormones promotes cell elongation, suppresses lateral bud growth, and regulates fruit development?
Auxins
Where are auxins primarily produced in plants?
Stem tips and root tips
What is the function of gibberellins in plants?
Stimulate stem elongation, seed germination, and fruit enlargement
Which plant hormone is responsible for apical dominance by inhibiting lateral bud growth?
Auxins
What happens to lateral buds when the tip of a plant stem is removed?
They start growing, leading to bushier plants
Which growth process is primarily influenced by auxins?
Phototropism (growth towards light)
What is the primary function of auxins in plants?
Facilitating cell elongation
Which plant growth process is controlled by auxins where they inhibit lateral bud growth?
Apical dominance
What is the main effect of removing the tip of a plant stem on lateral buds?
Lateral buds resume growth
Which growth process involves plants growing towards light?
Phototropism
What is the primary role of gibberellins in plants?
Promoting fruit enlargement
How do auxins contribute to plant growth in relation to root development?
Facilitate deeper root growth
What is the effect of auxins on lateral bud growth in terms of plant appearance?
Promoting bushier growth
What kind of growth does gibberellins stimulate in plants?
Seed germination
How do auxins contribute to apical dominance in plants?
Inhibit lateral bud growth
What effect does removing the stem tip have on lateral bud growth?
Lateral buds grow bushier
How do gibberellins contribute to agriculture?
By initiating germination and promoting flowering
What is the primary function of abscisic acid in relation to seeds?
Promotes seed dormancy
In geotropism, why do roots grow downward and shoots grow upward?
Auxins accumulate on the lower side due to gravity
How can synthetic auxins selectively kill broad-leaved weeds without harming grass or crops?
Due to differences in hormone sensitivity
What effect does ABA have on stomata during drought conditions?
Causes stomata closure to reduce water loss
Which plant hormone is known as the 'stress hormone'?
Abscisic Acid
What is the role of plant hormones in weed control?
'Chemical pruning' of unwanted plants
What is the key function of gibberellins in relation to seed germination?
'Break' seed dormancy and initiate germination
Which plant hormone promotes cell elongation, suppresses lateral bud growth, and regulates fruit development?
'Gibberellins'
'Role of Auxins in Geotropism and Phototropism:' Which statement accurately describes the role of auxins in phototropism?
'Auxins accumulate on the shaded side, leading plant bending towards light'
What is the primary function of gibberellins in plants?
Promotion of cell elongation
How do auxins contribute to apical dominance in plants?
By suppressing lateral bud growth
Where are auxins primarily produced in plants?
Stem tips
What happens to lateral buds when the tip of a plant stem is removed?
They grow vigorously
Why are synthetic auxins applied to broad-leaved weeds?
To induce uncontrolled growth
How do gibberellins contribute to agriculture?
By stimulating stem elongation
Which plant hormone plays a crucial role in preparing plants for winter by promoting leaf drop?
Abscisic Acid
What is the primary function of gibberellins in relation to flowering and fruit development?
Promoting flowering
How do synthetic auxins contribute to weed control in agricultural practices?
By selectively killing broad-leaved weeds
In geotropism, why do roots grow downward and shoots grow upward?
Auxins accumulate on the lower side of the plant
What is the main role of auxins in phototropism, a growth response to light?
Causing cells on the shaded side to elongate more
How do gibberellins contribute to seed germination?
By breaking seed dormancy and initiating germination
Which plant hormone is involved in closing stomata during drought conditions to reduce water loss?
'Abscisic Acid'
'Auxins' play a central role in which plant growth response?
'Geotropism'
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