29 Questions
Why does the vegetative phase precede flowering in a plant?
To ensure the plant reaches a certain size and maturity before investing energy in reproduction
What are the main components that make up all plant organs?
A variety of tissues
What is the relationship between the structure of a cell, a tissue, an organ, and their function?
There is a complex relationship between the structure and function of cells, tissues, and organs
What are all cells of a plant descended from?
Zygote
What two processes make up development in a plant?
Growth and differentiation
What is growth at a cellular level primarily a consequence of?
Increase in protoplasm
How is growth typically measured?
Increase in cell number
What is the growth parameter used to measure the growth of a pollen tube?
Length
In what way does a dorsiventral leaf exhibit growth?
Increase in surface area
How many new cells per hour can a single maize root apical meristem give rise to?
17,500
What are the three phases into which the period of growth is generally divided?
Meristematic, elongation, maturation
What is the role of ethylene in promoting plant growth?
Promoting root growth and root hair formation
Which compound is commonly used as a source of ethylene in agriculture?
Ethephon
What is the effect of ethylene on fruit ripening in tomatoes and apples?
Hastens ripening
What role does abscisic acid play in seed germination?
Inhibiting seed germination
What was the observation made by Charles Darwin and his son Francis Darwin regarding canary grass coleoptiles?
They grew towards the light source.
Which physiological process does ABA inhibit?
Stomata closure
Which plant growth regulator was isolated from the coleoptile tips of oat seedlings by F.W. Went?
Auxin
How does ABA contribute to plant tolerance to stresses?
By increasing the tolerance of plants to various kinds of stresses
What was the role of ethylene, the gaseous plant growth regulator, in growth activities?
It was an inhibitor of growth activities.
What caused the 'bakanae' disease in rice seedlings?
Gibberella fujikuroi fungal pathogen
How were the symptoms of the 'bakanae' disease induced in rice seedlings as reported by E. Kurosawa?
By treating with sterile filtrates of a fungus.
Which major group of plant growth regulators does abscisic acid belong to?
Auxins
What is the main function of turgidity in plant cells?
Facilitates extension growth
Why is water important for plant growth?
Water is essential for cell enlargement
Which environmental factor is crucial for certain phases of plant growth?
Temperature
What is the term used to describe the process when cells differentiate and mature to perform specific functions?
Differentiation
What structural changes occur in cells during differentiation to form a tracheary element?
Loss of protoplasm
How do nutrients contribute to plant growth?
Nutrients act as a source of energy
Explore the growth and development of plants, including the differentiation and redifferentiation of structures like roots, stems, leaves, flowers, fruits, and seeds. Learn about the process from seed to mature plant, understanding how trees increase in height or girth over time.
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