9 ශ්‍රේණිය විද්‍යාව - ශාක වර්ධක ද්‍රව්‍ය - 7 පාඩම (Grade 9 Science - Plant Growth Substances) скачать в хорошем качестве

9 ශ්‍රේණිය විද්‍යාව - ශාක වර්ධක ද්‍රව්‍ය - 7 පාඩම (Grade 9 Science - Plant Growth Substances)

👉🏼කැමති නම් Like ඒකක් දාන්න 👉🏼ඔනේ නම් Share කරන්න 👉🏼තව ඒ්වා ඔනේ නම් Subscribe කරන්න ‌👉🏼වෙළාවට ඔනේ නම් 🔔 අයිකන් ඒක click කරන්න -------------------------------------------------------------------------------------------------------------------- Plant growth substances, also known as plant hormones or phytohormones, are naturally occurring compounds that regulate various physiological processes in plants. These substances play a crucial role in controlling growth, development, and responses to environmental stimuli. There are several major classes of plant growth substances: Auxins: Auxins are primarily responsible for cell elongation and differentiation, as well as promoting apical dominance (the inhibition of lateral bud growth). The most well-known auxin is indole-3-acetic acid (IAA). Synthetic auxins like 2,4-dichlorophenoxyacetic acid (2,4-D) are used as herbicides. Gibberellins (GAs): Gibberellins are involved in stem elongation, germination, and flowering. They promote cell division and elongation, helping plants to grow taller. Gibberellic acid is a commonly known gibberellin. Cytokinins: Cytokinins regulate cell division and differentiation, promote lateral bud growth, delay senescence (aging), and stimulate chloroplast development. They are essential for promoting balanced growth throughout the plant. Zeatin is a well-known cytokinin. Abscisic Acid (ABA): ABA is involved in various stress responses, particularly in drought tolerance. It regulates stomatal closure, leading to reduced water loss through transpiration. ABA also plays a role in seed dormancy and germination inhibition. Ethylene: Ethylene is a gaseous hormone that influences fruit ripening, senescence, and abscission (the shedding of leaves, flowers, or fruits). It also plays a role in plant responses to stress and wound healing. Brassinosteroids: Brassinosteroids promote cell elongation and division, enhance stress tolerance, and are involved in various developmental processes like pollen tube elongation and vascular differentiation. Jasmonates: Jasmonates are involved in plant responses to biotic stress, such as insect feeding or pathogen attack. They regulate defense mechanisms, including the production of secondary metabolites like alkaloids and terpenoids. Salicylic Acid (SA): SA is a key player in the plant immune system, especially against pathogens. It triggers defense responses, including the activation of pathogenesis-related genes. These growth substances often interact and function in coordination to regulate plant growth and development. Their effects can be quite complex and context-dependent, influenced by factors such as concentration, tissue type, and environmental conditions. Researchers have been studying these substances for decades to better understand plant physiology and to develop applications in agriculture, horticulture, and plant biotechnology -------------------------------------------------------------------------------------------------------------------- contact 📧 thaproscience@gmail.com 📞 071- 1253200 WhatsApp - 0711253200 --------------------------------------------------------------------------------------------------------------------- Copyright Information Images , Videos and Music used in video are CC0 licensed clips. --------------------------------------------------------------------------------------------------------------------- #thaproscience #science#විද්‍යාව