ANSWERS TO REVIEW QUESTIONS – CHAPTER 18
... The main auxin occurring naturally in plants is indole-3-acetic acid (IAA) (see Figure 24.4). When applied to intact plants, IAA does not elicit large responses but is very effective in promoting growth of portions of stems or coleoptile segments by promoting elongation of cells. (b) Explain the aci ...
... The main auxin occurring naturally in plants is indole-3-acetic acid (IAA) (see Figure 24.4). When applied to intact plants, IAA does not elicit large responses but is very effective in promoting growth of portions of stems or coleoptile segments by promoting elongation of cells. (b) Explain the aci ...
Control Systems in Plants
... • Control plant growth and development by affecting division, elongation, and cell differentiation • Effect depends on size of action, stage of plant growth and hormone concentration • Hormonal signal is amplified by gene expression, enzyme activity, or membrane properties ...
... • Control plant growth and development by affecting division, elongation, and cell differentiation • Effect depends on size of action, stage of plant growth and hormone concentration • Hormonal signal is amplified by gene expression, enzyme activity, or membrane properties ...
here
... Plant Hormones Hormones are chemical signals that coordinate the various parts of an organism A hormone is a compound produced in one part of the body which is then transported to other parts of the body, where it triggers responses in target cells and tissues Examples of human hormones: Adrena ...
... Plant Hormones Hormones are chemical signals that coordinate the various parts of an organism A hormone is a compound produced in one part of the body which is then transported to other parts of the body, where it triggers responses in target cells and tissues Examples of human hormones: Adrena ...
action potentials
... Darwin and son his discovered that grass seedlings would not bend towards the light if the tip was removed and covered with an opaque cap. Boysen and Jensen demonstrated that the signal was a mobile substance. – They placed a gelatin block between the tip and the rest of the plant and demonstrated t ...
... Darwin and son his discovered that grass seedlings would not bend towards the light if the tip was removed and covered with an opaque cap. Boysen and Jensen demonstrated that the signal was a mobile substance. – They placed a gelatin block between the tip and the rest of the plant and demonstrated t ...
Plant responses to hormones
... Causes elongation of cells – Increases plasticity of cells – Cell walls soften – Cell becomes less turgid and take up more water – Cell expands Responsible ...
... Causes elongation of cells – Increases plasticity of cells – Cell walls soften – Cell becomes less turgid and take up more water – Cell expands Responsible ...
Auxins
... Went(1926) extracted the chemical messenger and impregnated agar blocks. The agar blocks were places on various parts of the plant and the plant bent in the opposite direction from which the agar block was placed. Showed that cells opposite of the elongated causing the stem to bend. The subs ...
... Went(1926) extracted the chemical messenger and impregnated agar blocks. The agar blocks were places on various parts of the plant and the plant bent in the opposite direction from which the agar block was placed. Showed that cells opposite of the elongated causing the stem to bend. The subs ...
Auxin
Auxins (plural of auxin /ˈɔːksɨn/) are a class of plant hormones (or plant growth substances) with some morphogen-like characteristics. Auxins have a cardinal role in coordination of many growth and behavioral processes in the plant's life cycle and are essential for plant body development. Auxins and their role in plant growth were first described by the Dutch scientist Frits Warmolt Went. Kenneth V. Thimann isolated this phytohormone and determined its chemical structure as indole-3-acetic acid (IAA). Went and Thimann co-authored a book on plant hormones, Phytohormones, in 1937.