The gaseous plant growth regulator is used in plants to:
- Seed up the malting process
- Promote root growth and root hair formation to increase the absorption surface
- Help overcome apical dominance
- Kill dicotyledonous weeds in the fields
The Correct Option is B
Solution and Explanation
- Ethylene is a gaseous phytohormone that plays a role in regulating both growth and senescence in plants.
- It is primarily produced in significant quantities by tissues undergoing senescence, as well as ripening fruits.
- The hormone has the ability to promote or inhibit growth and senescence processes within plants, and can also have specific effects such as inhibiting lateral buds, causing apical dominance, and promoting femaleness in certain plants like Pineapple and Cucumber.
- Additionally, ethylene has been shown to increase the number of female flowers in cucumber plants, leading to a higher final yield.
- Furthermore, it can increase the absorption surface area of the root by promoting both root growth and root hair formation.
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Concepts Used:
Plant Growth and Development
Growth in Plants:
Plants have the distinctive ability to grow throughout their life. The meristem cells present there in the roots and shoot apical lead to the primary growth of the plant. The primary growth which happens or takes place at the tips of the stem and roots of the plant contributes to the elongation of the plant along its axis.
In the later stages of growth in plants, the growth in dicotyledonous, vascular cambium, gymnosperms, and cork-cambium are also caused by the existence of meristems in them. These intercalary meristems are put up to increase the girth of the organs of the plant in which they are active. Such type of growth is commonly known as secondary growth.
Many parameters such as area, volume, fresh weight, cell number, dry weight, length, etc are utilized to measure the growth in plants as increase in the amount of protoplasm is responsible for the growth in plants.
Read More: Plant Growth and Development