Botany-2 Flashcards
What is the primary function of plant hormones?
To regulate plant growth and development.
True or False: Auxins are responsible for cell elongation.
True
Fill in the blank: The hormone that promotes fruit ripening is called _____ .
Ethylene
What are the five main classes of plant hormones?
Auxins, Gibberellins, Cytokinins, Abscisic Acid, Ethylene.
Which hormone is known for promoting seed germination?
Gibberellins
True or False: Cytokinins promote cell division.
True
What effect do auxins have on apical dominance?
They promote apical dominance by inhibiting lateral bud growth.
Which plant hormone is associated with stress responses?
Abscisic Acid
Multiple choice: Which hormone is primarily involved in the elongation of stems? A) Cytokinins B) Auxins C) Abscisic Acid
B) Auxins
What role do gibberellins play in flowering?
They promote flowering in certain plants.
Fill in the blank: _____ are used in agriculture to promote uniform fruit ripening.
Ethylene
Which hormone helps in the regulation of stomatal closure?
Abscisic Acid
True or False: Ethylene is a gas at room temperature.
True
What is the main effect of cytokinins in plants?
They promote cell division and shoot formation.
Multiple choice: What is the effect of auxins on root growth? A) Promote A) Inhibit B) No effect
A) Promote
What is the process of apical dominance?
The phenomenon where the main stem grows more strongly than the side stems.
Fill in the blank: Gibberellins are involved in _____ and seed dormancy.
breaking
Which hormone is often used to delay senescence in cut flowers?
Cytokinins
True or False: Auxins can promote the development of fruit without fertilization.
True
What are the effects of abscisic acid on plant growth?
It inhibits growth and promotes dormancy.
Multiple choice: Which hormone is synthesized in response to environmental stress? A) Gibberellins B) Auxins C) Abscisic Acid
C) Abscisic Acid
What is the primary site of auxin production in plants?
The apical meristem.
Fill in the blank: _____ is the hormone responsible for leaf abscission.
Ethylene
True or False: Cytokinins are synthesized in roots and transported to other parts of the plant.
True
What is the role of gibberellins in stem elongation?
They promote cell elongation and division.
Multiple choice: Which hormone is known to stimulate the growth of lateral roots? A) Ethylene B) Gibberellins C) Auxins
C) Auxins
What is the relationship between auxins and phototropism?
Auxins cause the plant to bend toward light by promoting cell elongation on the side away from the light.
Fill in the blank: _____ is often referred to as the ‘stress hormone’ in plants.
Abscisic Acid
True or False: Ethylene promotes leaf senescence.
True
What is the function of gibberellins in fruit development?
They promote growth and development of fruits.
Multiple choice: Which hormone is primarily responsible for cell differentiation? A) Cytokinins B) Ethylene C) Auxins
A) Cytokinins
What is the role of auxins in herbicide action?
They disrupt plant growth by causing uncontrolled cell elongation.
Fill in the blank: _____ is produced in response to light and gravity.
Auxins
True or False: Gibberellins can break seed dormancy.
True
What effect does ethylene have on fruit ripening?
It accelerates the ripening process.
Multiple choice: Which hormone is used in tissue culture to promote shoot formation? A) Gibberellins B) Cytokinins C) Abscisic Acid
B) Cytokinins
What is the primary function of abscisic acid in plants?
To regulate water loss and stress responses.
Fill in the blank: Auxins are often used in _____ to propagate plants.
rooting hormones
True or False: Cytokinins can delay senescence in leaves.
True
What is the effect of abscisic acid on seed germination?
It inhibits seed germination.
Multiple choice: Which hormone is associated with the promotion of flowering in long-day plants? A) Auxins B) Gibberellins C) Ethylene
B) Gibberellins
What is the role of ethylene in plant responses to mechanical stress?
It helps plants adapt to mechanical stress by promoting thickening of stems.
Fill in the blank: _____ is a natural growth regulator involved in the ripening of bananas.
Ethylene
True or False: Auxins inhibit lateral root formation.
False
What is the importance of cytokinins in agricultural practices?
They are used to enhance crop yield and delay aging.
Multiple choice: Which hormone is primarily involved in fruit development? A) Abscisic Acid B) Gibberellins C) Cytokinins
B) Gibberellins
What is the effect of auxins on root formation?
They promote the formation of adventitious roots.
Fill in the blank: _____ promotes the growth of axillary buds.
Cytokinins
True or False: Ethylene is involved in the process of senescence.
True
What is the role of abscisic acid in drought conditions?
It promotes stomatal closure to reduce water loss.
Multiple choice: Which hormone is known for its role in breaking dormancy in seeds? A) Cytokinins B) Gibberellins C) Ethylene
B) Gibberellins
What is the primary site of gibberellin production?
Young tissues, such as developing seeds and leaves.
Fill in the blank: Ethylene is produced in response to _____ and stress.
wounding
True or False: Cytokinins promote shoot growth over root growth.
True
What is the significance of auxins in phototropism?
They cause differential growth in response to light direction.
Multiple choice: Which hormone can inhibit the synthesis of ethylene? A) Gibberellins B) Abscisic Acid C) Auxins
B) Abscisic Acid
What is the overall effect of gibberellins on plant height?
They increase plant height by promoting internode elongation.
Fill in the blank: _____ is involved in the regulation of leaf and fruit abscission.
Ethylene
True or False: Auxins are synthesized in response to environmental stimuli.
True
What is the role of cytokinins in plant tissue culture?
They stimulate shoot proliferation and regeneration.
Multiple choice: Which hormone can delay fruit ripening? A) Gibberellins B) Abscisic Acid C) Ethylene
B) Abscisic Acid
What is the primary role of auxins in root growth?
To promote the elongation of root cells.
